This table gives the times that pests can be most effectively controlled in New York State. Calendar timing is a broad approximation and applies only to southeastern New York during an average/normal season. Timing will vary for other areas and seasonally from year to year. Use the three timing systems by checking one against the other. Timing systems are not a substitute for scouting. For more information on these systems of timing applications see section 2.6.3.
Table 2.8.1. Pest management timing by calendar, growing degree-day (GDD), and plant phenology indicator (PPI) |
Host | Pest | Stage | GDD (Base 50°F) |
Dormant Season (usually March or early April): No plant phenological markers offered for dormant season. |
Arborvitae | Fletcher scale | immature | 20-60 |
| spruce spider mite | egg | 7-121 |
Azalea | azalea bark scale | adult | Not Available |
Bittersweet | euonymus scale | adult | 35-70 |
Crabapple | European red mite | egg | 7-58 |
Deciduous plants | aphids | egg | 7-100 |
Douglas-fir | Cooley spruce gall adelgid | immature | 22-91 |
Elm | elm bark beetle | larva | 7-120 |
| European elm scale | nymph | 7-120 |
| European red mite | egg | 7-58 |
| lecanium scales | adult | 35-110 |
Euonymus | euonymus scale | adult | 35-70 |
Flowering fruit trees | lecanium scales | adult | 35-110 |
Hemlock | elongate hemlock scale | adult | 7-120 |
| hemlock rust mite | immature/adult | 7-450 |
| hemlock scale | adult | 35-121 |
| spruce spider mite | egg | 7-121 |
Holly | southern red mite | egg | 7-91 |
Honeylocust | lecanium scales | adult | 35-110 |
Juniper | juniper scale | adult/egg | 22-148 |
| spruce spider mite | egg | 7-121 |
Lilac | oystershell scale | egg | 7-91 |
Magnolia | magnolia scale | nymph | 22-91 |
Maple | lecanium scales | adult | 35-110 |
| maple gall mites | adult | 50-148 |
Mountain ash | European red mite | egg | 7-58 |
Oak | golden oak scale | adult | 7-121 |
| kermes oak scale | adult | 7-91 |
| lecanium scales | adult | 35-110 |
Pachysandra | euonymus scale | adult | 35-70 |
Pine | pine bark adelgid | immature | 22-58 |
| pine needle scale | eggs,females | 22-58 |
| spruce spider mite | egg | 7-121 |
Spruce | eastern spruce gall adelgid | immature | Not Available |
| spruce bud scale | immature | 22-121 |
| spruce spider mite | egg | 7-121 |
Tuliptree | tuliptree scale | immature | 12-121 |
White pine | white pine aphid | egg | 7-121 |
Willow | oystershell scale | egg | 7-91 |
Yew | cottony taxus scale | immature | 7-91 |
| Fletcher scale | nymph | 20-60 |
| taxus mealybug | immature | 7-91 |
Delayed Dormant Season, Spring | | |
April (early to mid-): Plants in bloom: silver maple, Cornelian cherry, pussy willow |
Cedar | pales weevil | adult | 7-121 |
Cypress | pales weevil | adult | 7-121 |
Elm | elm bark beetles | immature | 7-120 |
Fir | pales weevil | adult | 7-121 |
Hemlock | hemlock rust mite | immature/adult | 7-450 |
| pales weevil | adult | 7-122 |
| hemlock woolly adelgid | egg/adult | Not Available |
Juniper | pales weevil | adult | 7-121 |
Larch | pales weevil | adult | 2-121 |
Oak | oak leaftier | larva | 7-35 |
Pines | European pine shoot moth | larva | 34-121 |
| pales weevil | adult | 7-121 |
| pine bark adelgid | immature | 22-58 |
| white pine weevil | adult | 7-58 |
Spruce | pales weevil | adult | 7-121 |
| white pine weevil | adult | 7-58 |
April (late): Plants in bloom: boxelder, star magnolia, periwinkle, Norway maple | |
Butternut | butternut gall mite | adult/immature | 7-68 |
Cedar | pales weevil | adult | 7-121 |
Cherry | tent caterpillars | larva | 90-190 |
Cypress | pales weevil | adult | 7-121 |
Elm | elm bark beetles | immature/adult | 7-120 |
Fir | balsam twig aphid | nymph | 58-120 |
| pales weevil | adult | 7-121 |
Hemlock | hemlock rust mite | immature/adult | 7-450 |
| pales weevil | adult | 7-122 |
| hemlock woolly adelgid | egg/crawler | Not Available |
Hickory | hickory leaf stem gall phylloxera | nymph | 91-240 |
Honeylocust | honeylocust plant bug | nymph | 58-246 |
Honeysuckle | honeysuckle aphid | nymph | Not Available |
Juniper | pales weevil | adult | 7-121 |
Larch | larch casebearer | larva | 148-363 |
| pales weevil | adult | 7-121 |
Maple | cottony maple scale | immature | 7-68 |
Pines | European pine sawfly | larva | 35-145 |
| European pine shoot moth | larva | 3-121 |
| pales weevil | adult | 7-121 |
| pine bark adelgid | immature | 58-618 |
| white pine weevil | adult | 7-58 |
| Zimmerman pine moth | larva | 121-246 |
Privet | white prunicola scale | egg | 35-145 |
Prunus | white prunicola scale | eggs | 35-145 |
Spruce | balsam twig aphid | nymph | 58-120 |
| pales weevil | adult | 7-121 |
| spruce budworm | larva | Not Available |
| white pine weevil | adult | 7-58 |
Walnut | butternut gall mite | adult/immature | 7-68 |
White pine | pine tube moth | larva | 91-246 |
May (early): Plants in bloom: Japanese quince, saucer magnolia, bridalwreath, Japanese flowering cherry |
Arborvitae | Fletcher scale | immature | 60-148 |
Beech | cankerworms | larva | 148-290 |
Birch | leafminer | larva | 190-290 |
Bittersweet | euonymus scale | adult/crawler | 70-120 |
Butternut | butternut gall mite | immature | 68-215 |
Cherry | eastern tent caterpillar | larva | 90-190 |
Deciduous plants | aphids | nymph/adult | 100-200 |
| European fruit lecanium scale | immature | 145-180 |
Dogwood | dogwood borer | moth | 148-700 |
Douglas-fir | Cooley spruce gall adelgid | immature/adult | 22-91 |
Elm | cankerworms | larva | 148-290 |
| European fruit lecanium scale | immature | 145-180 |
| woolly elm aphid | nymph/adult | 121-246 |
Euonymus | euonymus scale | adult/crawler | 70-120 |
Evergreens | lecanium scale | immature | 60-148 |
Fir | balsam gall midge | larva | 120-290 |
| balsam twig aphid | nymph/adult | 58-120 |
Hackberry | hackberry psylla | adult/egg | 148-448 |
Hemlock | hemlock rust mite | immature/adult | 7-450 |
| hemlock woolly adelgid | egg/crawler | Not Available |
Hickory | hickory leaf stem gall phylloxera | nymph | 91-246 |
Holly | southern red mite | nymph/adult | 246-263 |
Honeylocust | honeylocust plant bug | nymph | 58-246 |
Larch | larch casebearer | larva | 148-363 |
| woolly larch adelgid | immature | 121-192 |
Lilac | lilac borer (moth) | adult | 148-299 |
Linden | cankerworms | larva | 148-290 |
Maple | cottony maple scale | immature | 68-178 |
Oak | cankerworms | larva | 148-290 |
| European fruit lecanium scale | immature | 145-180 |
| oak leaf gall maker | adult | Not Available |
Pachysandra | euonymus scale | adult/crawler | 120-190 |
Pine | pine spittlebug | nymph | 148-298 |
| Zimmerman pine moth | larva | 121-246 |
Privet | white prunicola scale | eggs | 35-145 |
Prunus | white prunicola scale | eggs | 35-145 |
Spruce | balsam twig aphid | nymph/adult | 58-120 |
| Cooley spruce gall adelgid | nymph | 22-91 |
| eastern spruce gall adelgid | nymph | Not Available |
| woolly larch adelgid | nymph | 121-192 |
Viburnum | snowball aphid | nymph/adult | 148-198 |
Walnut | butternut gall mite | adult/immature | 68-215 |
White pine | pine tube moth | larva | 91-246 |
| white pine aphid | nymph | 121-246 |
Yew | taxus bud mite | adult/immature | 148-448 |
May (mid-): Plants in bloom: redbud, Sargent crabapple, flowering almond, Tatarian honeysuckle |
Arborvitae | spruce spider mite | immature/adult | 192-250 |
Ash | lace bugs | immature | 239-363 |
Azalea | rhododendron borer | adult | 192-198 |
Beech | cankerworms | larva | 148-290 |
Birch | birch leafminer | larva | 190-290 |
Boxwood | boxwood mite | immature/adult | 245-600 |
Butternut | butternut gall mite | adult/immature | 215-340 |
Cherry | tent caterpillars | larva | 190-363 |
Deciduous plants | aphids | nymph/adult | 100-250 |
| forest tent caterpillar | larva | 192-363 |
| gypsy moth | larva | 90-448 |
| tussock moths | larva | 192-298 |
Dogwood | dogwood borer | moth/egg | 148-700 |
Elm | cankerworms | larva | 148-290 |
| clover mite | adult/immature | 192-298 |
| elm leafminer | adult | 263-530 |
| European red mite | adult/immature | 240-440 |
| forest tent caterpillar | larva | 192-363 |
| linden looper | larva | 192-363 |
| woolly elm aphid | nymph/adult | 121-246 |
Fir | balsam gall midge | larva | 120-290 |
Flowering fruit trees | European red mite | adult/immature | 240-440 |
Hackberry | hackberry psylla | egg/immature | 148-448 |
Hemlock | hemlock rust mite | immature/adult | 7-450 |
| spruce spider mite | adult/immature | 192-364 |
| hemlock woolly adelgid | egg/nymph | Not Available |
Hickory | hickory leaf stem gall phylloxera | nymph | 91-246 |
| lace bugs | immature | 239-363 |
Holly | holly leafminer | adult | 246-448 |
| native holly leafminer | adult | 192-298 |
| southern red mite | immature/adult | 246-363 |
Honeysuckle | clover mite | immature/adult | 192-298 |
Juniper | spruce spider mite | adult/immature | 292-363 |
Larch | larch sawfly | larva | 192-299 |
| woolly larch adelgid | immature | 121-192 |
Lilac | lilac borer | adult (moth) | 148-299 |
| lilac leafminer | moth/egg | 246-363 |
Linden | cankerworms (linden looper) | larva | 192-363 |
| lace bugs | immature | 239-363 |
London plane | American plum borer | moth | 245-440 |
Maple | linden looper | larva | 192-363 |
| maple bladder-gall mite | adult/immature | 98-155 |
| maple mealybug | immature | Not Available |
| tent caterpillars | larva | 192-363 |
Mountain laurel | rhododendron borer | moth | 192-298 |
Oak | cankerworms | larva | 148-290 |
| lace bugs | immature | 239-363 |
| linden looper | larva | 192-363 |
| oak leaf gall maker | adult | Not Available |
| tent caterpillars | larva | 192-363 |
Pine | pine bark adelgid | immature | 190-618 |
| pine sawflies | larva | 246-? |
| pine spittlebug | nymph | 148-298 |
| spruce spider mite | adult/immature | 192-363 |
| Zimmerman pine moth | larva | 121-246 |
Privet | lilac leafminer | moth/egg | 246-363 |
Rhododendron | rhododendron borer | moth | 192-298 |
Spruce | eastern spruce gall adelgid | immature | 170-? |
| pine sawflies | | 246-? |
| spruce spider mite | adult/immature | 292-363 |
| woolly larch adelgid | immature | 121-192 |
Sycamore | lace bugs | immature | 239-363 |
Viburnum | snowball aphid | nymph/adult | 148-298 |
| viburnum leaf beetle | larva | 60-120 |
Walnut | butternut gall mite | | 68-215 |
| lace bugs | immature | 239-363 |
White pine | white pine aphid | nymph/adult | 121-246 |
Willow | imported willow leaf beetle | adult | 192-448 |
Yew | taxus bud mite | adult | 148-448 |
| taxus mealybug | immature | 246-325 |
May (late): Plants in bloom: ruby horsechestnut, Laburnum alpinum, black locust, ninebark |
Apple (crab) | oystershell scale | crawler | 363-707 |
Arborvitae | arborvitae leafminer | larva/adult | 245-360 |
| arborvitae weevil | adult | 150-260 |
| spruce spider mite | adult/immature | 250-363 |
Ash | lace bugs | adult/immature | 239-363 |
Azalea | rhododendron stem borer | adult | 298-400 |
Beech | cankerworms | larva | 148-290 |
| woolly beech aphid | eggs/nymphs | 363-707 |
| | | |
Birch | birch leafminer | adult | 190-290 |
Black locust | locust leafminer | adult | 298-533 |
Boxwood | boxwood mite | immature/adult | 245-600 |
| boxwood psyllid | nymph/adult | 290-440 |
Butternut | walnut blister mite | immature/adult | 363-707 |
Chamaecyparis | arborvitae weevil | adult | 150-260 |
Cherry | tent caterpillars | larva | 190-? |
Deciduous plants | forest tent caterpillar | larva | 192-363 |
| gypsy moth | larva | 90-448 |
| tussock moths | larva | 92-298 |
Elm | cankerworm | larva | 148-290 |
| elm casebearer | larva | 300-533 |
| elm leaf beetle | adult | 363-912 |
| elm leafminer | adult | 263-530 |
| European red mite | egg/immature | 240-810 |
| forest tent caterpillar | larva | 192-363 |
| linden looper | larva | 192-363 |
| twospotted spider mite | egg/immature | 363-618 |
Flowering fruit trees | leafroller | egg/larva | 300-618 |
| redbanded leafroller | egg/larva | 298-618 |
| twospotted spider mite | immature | 363-618 |
Hackberry | hackberry psylla | adult/egg | 148-448 |
Hemlock | elongate hemlock scale | crawler | 360-700 |
| hemlock rust mite | immature/adult | 7-450 |
| spruce spider mite | immature | 192-363 |
Hickory | lace bugs | immature | 239-363 |
Holly | holly leafminer | adult | 246-448 |
| southern red mite | immature | 246-363 |
Honeylocust | honeylocust pod gall midge | adult/egg | 192-229 |
Honeysuckle | clover mite | immature | 192-298 |
Juniper | arborvitae weevil | adult | 150-260 |
| spruce spider mite | adult/immature | 190-363 |
Larch | larch sawfly | larva | 192-299 |
Lilac | lilac borer | moth | 148-299 |
| lilac leafminer | moth | 246-363 |
| oystershell scale | crawler | 363-707 |
Linden | cankerworms | larva | 148-290 |
| lace bugs | adult/egg | 239-363 |
| linden looper | larva | 192-363 |
| twospotted spider mite | immature | 363-618 |
London plane | American plum borer | moth | 245-440 |
Magnolia | magnolia weevil = sassafras weevil | adult/egg | 363-618 |
Maple | linden looper | larva | 192-363 |
Mountain laurel | rhododendron stem borer | adult | 298-400 |
Oak | cankerworm | larva | 148-290 |
| kermes oak scale | egg | 298-912 |
| lace bugs | adult/egg | 239-363 |
| linden looper | larva | 192-363 |
Pine | Nantucket pine tip moth | larva | 121-448 |
| pine bark adelgid | immature | 58-618 |
| pine eriophyid mites | immature/adult | 298-533 |
| pine needle scale | crawler | 298-448 |
| pine sawflies | larva | 248-1388 |
| pitch twig moth | moth | Not Available |
| spruce spider mite | immature/adult | 190-363 |
| white pine weevil | adult | - |
Privet | lilac leafminer | moth | 246-363 |
| privet rust mite | egg/immature | 298-802 |
Rhododendron | black vine weevil | adult | 148-400 |
| rhododendron stem borer | adult | 298-802 |
Rose | roseslug | larva | Not Available |
| twospotted spider mite | immature/adult | 363-618 |
Sassafras | sassafras weevil | adult/egg | 363-618 |
Shade trees | fruittree leafroller | larva | 300-618 |
Spruce | pine eriophyid mites | immature | 298-533 |
| sawflies | larva | 248-? |
| spruce spider mite | immature/adult | 190-363 |
| white pine weevil | adult | Not Available |
Sycamore | lace bugs | adult/egg | 239-363 |
Taxus | black vine weevil | adult | 148-400 |
| taxus bud mite | immature/adult | 148-448 |
| taxus mealybug | immature | 246-325 |
Walnut | lace bugs | adult/egg | 239-363 |
| walnut blister mite | immature | 363-707 |
White pine | white pine weevil | - | |
Willow | imported willow leaf beetle | adult | 192-448 |
| oystershell scale | crawler | 363-707 |
| willow flea weevil | adult | 363-618 |
June (early): Plants in bloom: Kousa dogwood, cranberry bush, beautybush | |
Andromeda | azalea whitefly | immature | 448-700 |
| lace bugs | adult/immature | 448-618 |
Apple (crab) | oystershell scale | settled crawler | 363-707 |
Arborvitae | arborvitae leafminer | larva/adult | 245-360 |
| arborvitae weevil | adult | 150-260 |
| spruce spider mite | adult/immature | 250-363 |
Azalea | azalea leafminer | moth | 450-800 |
| azalea whitefly | immature | 448-700 |
| lace bugs | egg/immature | 448-618 |
| rhododendron stem borer | adult | 298-802 |
Beech | woolly beech aphid | nymph/adult | 363-707 |
Birch | birch leafminer | adult | 190-290 |
| bronze birch borer | adult | 440-800 |
Bittersweet | euonymus scale | egg/crawler | 533-600 |
Black locust | locust leafminer | adult/eggs | 298-533 |
Boxwood | boxwood leafminer | adult | 350-600 |
| boxwood mite | immature/adult | 245-600 |
Butternut | walnut blister mite | immature/adult | 363-707 |
Cedar | spruce spider mite | immature/adult | 363-? |
Deciduous plants | Redbanded leafroller | larva | 298-618 |
| periodical cicada | adult | 363-618 |
| Redbanded leafroller | larva | 298-618 |
| rust mite | immature/adult | 533-802 |
Dogwood | dogwood borer | moth | 148-700 |
Elm | elm casebearer | larva | 300-533 |
| elm leaf beetle | adult/egg | 363-912 |
| elm leafminer | adult/larva | 363-530 |
| European red mite | immature | 240-810 |
| twospotted spider mite | immature | 363-618 |
Euonymus | euonymus scale | egg/crawler | 533-600 |
Flowering fruit trees | European red mite | immature/adult | 240-810 |
| redbanded leafroller | larva | 300-618 |
Fruit trees (ornamental) | twospotted spider mite | immature/adult | 363-618 |
Hawthorn | hawthorn leafminer | adult | Not Available |
Hemlock | elongate hemlock scale | crawler/immature | 360-700 |
| hemlock looper | larva | 448-707 |
| spruce spider mite | immature/adult | 363-? |
Holly | southern red mite | immature/adult | 618-802 |
Juniper | arborvitae leafminer | adult | 360-? |
| Spruce spider mite | immature/adult | 363-? |
Lilac | lilac borer | moth | 400 approx. |
| oystershell scale | crawler | 363-707 |
Linden | twospotted spider mite | immature/adult | 363-618 |
Magnolia | sassafras weevil | adult/egg | 363-618 |
Maple | greenstriped mapleworm | larva | 533-1645 |
Mountain ash | mountain ash sawfly | larva | 448-707 |
Mountain laurel | azalea whitefly | immature | 448-700 |
| rhododendron stem borer | adult | 298-802 |
Oak | kermes oak scale | egg/crawler | 298-912 |
| leafminers | moth | 533-912 |
| oak skeletonizer | moth/egg | 448-707 |
Pachysandra | euonymus scale | crawler | 533-820 |
Pine | pine eriophyid mites | immature/adult | 298-533 |
| pine needle scale | crawler/immature | 298-448 |
| pine sawflies | larva | 248-1388 |
| pitch twig moth | moth/egg | Not Available |
| redheaded pine sawfly | larva | Not Available |
| spruce spider mite | adult/immature | 363-? |
| white pine weevil | adult | Not Available |
Poplar | satin moth | larva | 298-618 |
Privet | thrips | adult/immature | 192-618 |
Rhododendron | azalea whitefly | immature | 448-700 |
| lace bugs | egg/immature | 448-618 |
| rhododendron borer | adult | 533-707 |
| rhododendron stem borer | adult | 298-400 |
Rose | rose chafer | adult | 448-802 |
| roseslug | larva | Not Available |
| twospotted spider mite | immature/adult | 363-618 |
Sassafras | sassafras weevil | adult/egg | 363-618 |
Spruce | elongate hemlock scale | crawler/immature | 360-700 |
| spruce spider mite | immature/adult | 363-? |
| white pine weevil | adult | Not Available |
Taxus | black vine weevil | adult | 400-2800 |
| taxus mealybug | immature/adult | 246-618 |
Walnut | walnut blister mite | immature/adult | 363-707 |
Willow | imported willow leaf beetle | adult | 192-448 |
| oystershell scale | crawler | 363-707 |
| willow flea weevil | adult | 363-618 |
June (mid-): Plants in bloom: mountain laurel, mock-orange, Japanese tree lilac, Washington thorn |
Andromeda | azalea whitefly | immature/adult | 448-700 |
Apple | oystershell scale | settled crawler | 363-707 |
Arborvitae | arborvitae leafminer | adult | 533-700 |
| bagworm | larva | 600-900 |
| juniper scale | crawlers | 707-1260 |
Azalea | azalea leafminer | moth/egg | 450-800 |
| azalea whitefly | immature/adult | 448-700 |
| lace bug | immature | 448-618 |
| rhododendron stem borer | adult | 298-802 |
Beech | woolly beech aphid | nymph/adult | 363-707 |
Birch | birch leafminer | adult | 530-700 |
| bronze birch borer | adult | 440-800 |
Bittersweet | euonymus scale | crawler | 533-600 |
Boxwood | boxwood leafminer | adult | 350-600 |
| boxwood mite | adult | 245-600 |
Butternut | walnut blister mite | adult | 363-707 |
Deciduous plants | aphids | immature/adult | 250-2800 |
Deciduous plants (most) | leafhoppers | immature/adult | 618-802 |
| rust mite | immature/adult | 533-802 |
Dogwood | dogwood borer | moth | 148-700 |
Elm | elm leaf beetle | egg/larva | 363-912 |
| European red mite | immature/adult | 240-810 |
| twospotted spider mite | immature/adult | 363-618 |
| woolly aphid | immature | 710-1500 |
Euonymus | euonymus scale | crawler | 533-600 |
Evergreens (broadleaf) | southern red mite | immature/adult | 618-802 |
Flowering fruit trees | European red mite | immature/adult | 240-810 |
| leafhoppers | immature/adult | 618-802 |
| twospotted spider mite | immature/adult | 363-618 |
| hawthorn leafminer | adult | Not Available |
Hemlock | elongate hemlock scale | crawler/immature | 360-700 |
| hemlock looper | larva | 448-707 |
Holly | southern red mite | immature/adult | 618-802 |
Juniper | arborvitae leafminer | adult | 360-? |
| juniper scale | crawler | 707-1260 |
Lilac | lilac borer | moth | 400 approx. |
| oystershell scale | crawler | 363-707 |
| white peach scale = prunicola scale | crawler | 707-1151 |
Linden | twospotted spider mite | immature/adult | 363-618 |
Magnolia | sassafras weevil | adult/egg | 363-618 |
Maple | greenstriped mapleworm | larva | 533-1645 |
Mountain ash | mountain ash sawfly | larva | 448-707 |
Mountain laurel | azalea whitefly | immature/adult | 448-700 |
| rhododendron stem borer | adult | 298-802 |
Oak | golden oak scale | crawler | Not Available |
| kermes oak scale | crawler | 298-912 |
| leafminers | moth/egg | 533-912 |
| oak skeletonizer | larva | 448-707 |
Pachysandra | euonymus scale | crawler | 533-820 |
Pine | Nantucket pine tip moth | moth | 448-? |
| pine needleminer | moth/egg | 448-802 |
| pine root collar weevil | adult | 618-912 |
| pine sawflies | larva | 248-1388 |
| pitch twig moth | adult/egg | 298-707 |
| redheaded pine sawfly | larva | Not Available |
| white pine weevil | adult | Not Available |
Poplar | satin moth | larva | 448-700 |
Privet | privet rust mite | immature/adult | 298-802 |
| thrips | adult/immature | 192-618 |
| white prunicola scale | crawler | 707-1151 |
Rhododendron | azalea whitefly | immature/adult | 448-618 |
| black vine weevil | adult | 400-2800 |
| rhododendron borer | adult | 533-707 |
| rhododendron stem borer | adult | 400-802 |
Rose | rose chafer | adult | 448-802 |
| roseslug | larva | Not Available |
| twospotted spider mite | immature/adult | 363-618 |
Sassafras | sassafras weevil | adult/egg | 363-618 |
Spruce | elongate hemlock scale | crawler/immature | 360-700 |
| white pine weevil | adult | Not Available |
Stone fruits (flowering) | white prunicola scale | crawler | 707-1151 |
Taxus | black vine weevil | adult | 400-2800 |
| mealybug | immature/adult | 618-? |
| taxus bud mite | immature/adult | 707-912 |
Walnut | walnut blister mite | immature/adult | 707 |
White cedar | bagworm | larva | 600-900 |
Willow | imported willow leaf beetle | adult | 192-448 |
| oystershell scale | crawler | 363-707 |
| willow flea weevil | adult/larva | 707-1029 |
June (late): Plants in bloom: Rhododendron maximum, Spiraea bumalda, Philadelphus |
Andromeda | azalea bark scale | egg/immature | Not Available |
| lace bugs | immature/adult | 618+ |
Apple | roundheaded appletree borer | adult | 802-1029 |
Arborvitae | bagworm | larva | 600-900 |
| Fletcher scale | crawler | ?-802 |
| juniper scale | crawler | 707-1260 |
Azalea | azalea bark scale | egg/immature | Not Available |
| lace bugs | immature/adult | 618+ |
Deciduous plants | aphids | immature/adult | 250-2800 |
| cottony maple scale | egg/crawler | 802-1265 |
| leafhoppers | immature/adult | 618-802 |
Elm | elm leaf beetle | larva | 363-912 |
| European red mite | immature/adult | 240-810 |
| woolly elm aphid | immature/adult | 710-1500 |
Flowering fruit trees | European red mite | immature/adult | 240-810 |
Hawthorn | roundheaded appletree borer | adult | 802-1029 |
Hemlock | elongate hemlock scale | crawler | 700-? |
| hemlock looper | larva | 707-? |
Honeylocust | cottony maple scale | egg/crawler | 802-1265 |
Juniper | juniper scale | crawler | 707-1260 |
Lilac | white prunicola scale | crawler | 707-1151 |
Maple | cottony maple scale | egg/crawler | 802-1265 |
| greenstriped mapleworm | larva | 533-1645 |
Mountain ash | mountain ash sawfly | larva | 707-? |
| roundheaded appletree borer | adult | 802-1029 |
Oak | golden oak scale | crawler | 802-1266 |
| kermes oak scale | crawler | 298-912 |
| oak leafminer | moth/egg | 533-912 |
| oak spider mite | immature | 802-1266 |
Pine | pine needleminer | moth/egg | 448-802 |
| pine root collar weevil | adult | 618-912 |
| pine sawflies | larva | 248-1388 |
| pine tortoise scale | crawler | 618-1050 |
| pine webworm | larva | 802-2000 |
| redheaded pine sawfly | larva | Not Available |
| white pine weevil | adult | Not Available |
| Zimmerman pine moth | moth | 912-1917 |
Privet | white prunicola scale | crawler | 707-1151 |
Rhododendron | azalea bark scale | egg/immature | Not Available |
| lace bugs | immature | 802-1029 |
Rose | roseslug | larva | Not Available |
Shadbush | roundheaded appletree borer | adult | 802-1029 |
Spruce | elongate hemlock scale | crawler | 700-? |
| spruce bud scale | crawler | 912-1388 |
| white pine weevil | adult | Not Available |
Stone fruits (flowering) | peach tree borer | larva | Not Available |
| white prunicola scale | crawler | 707-1151 |
Taxus | black vine weevil | adult | 400-2800 |
| Fletcher scale | crawler | ?-802 |
| mealybug | adult | ? |
| taxus bud mite | immature/adult | 707-912 |
| taxus cottony scale | crawler | 802-1388 |
White cedar | bagworm | larva | 600-900 |
Willow | willow flea weevil | | 707-1029 |
July (early): Plants in bloom: Ceanothus americanus, Clematis x jackmanii, Tilia cordata |
Andromeda | azalea bark scale | immature | Not Available |
Arborvitae | Fletcher scale | crawler | 1029-1388 |
| juniper scale | crawler | 707-1260 |
Azalea | azalea bark scale | immature | Not Available |
Black locust | cottony maple scale | crawler | 802-1265 |
| locust leafminer | adult | 1029-1388 |
Black walnut | walnut caterpillar | larva | 1029-1514 |
Boxwod | boxwood leafminer | larva | 1200-2400 |
Butternut | walnut | larva | 1029-1514 |
Crabapple | roundheaded appletree borer | adult | 802-1029 |
Deciduous plants | Japanese beetle | adult | 1029-2154 |
Deciduous trees | cottony maple scale | crawler | 802-1265 |
Dogwood | dogwood sawfly | larva | 1151-1500 |
Elm | elm woolly aphid | immature/adult | 710-1500 |
| European elm scale | crawlers | Not Available |
Evergreens | lecanium scale | crawlers | 1029-1388 |
Hickory | walnut caterpillar | larva | 1029-1514 |
Honeylocust | honeylocust mite | immature/adult | 912-1514 |
Holly | native holly leafminer | larva | 1029-1266 |
Juniper | juniper scale | crawler | 707-1260 |
Lilac | white prunicola scale | crawler | 707-1151 |
Maple | cottony maple scale | crawler | 802-1265 |
| greenstriped mapleworm | larva | 533-1645 |
Oak | golden oak scale | crawler | 802-1266 |
| kermes oak scale | crawler | 912-? |
| oak spider mite | immature/adult | 802-1266 |
Pine | pine needleminer | larva | 802-? |
| pine webworm | larva | 802-2000 |
| redheaded pine sawfly | larva | Not Available |
| Zimmerman pine moth | moth | 912-1917 |
Privet | thrips | immature | 1029-1266 |
| white prunicola scale | crawler | 707-1151 |
Rhododendron | azalea bark scale | crawler | Not Available |
Spruce | spruce bud scale | crawler | 912-1388 |
Stone fruits (flowering) | peach tree borer | larva | Not Available |
| white prunicola scale | crawler | 707-1151 |
Taxus | black vine weevil | adult | 400-2800 |
| cottony taxus scale | crawler | 802-1388 |
| Fletcher scale | crawler | 1029-1388 |
Viburnum | viburnum leaf beetle | adult | 800-? |
White pine | pine tube moth | larva | 1151-1514 |
Willow | willow flea weevil | adult/larva | 707-1029 |
July (mid-): Plants in bloom: Abelia, golden rain tree, sourwood | |
Andromeda | azalea whitefly | immature/adult | 1250-1500 |
Arborvitae | arborvitae leafminer | moth | 1200 approx. |
| Fletcher scale | crawler | 1029-1388 |
Azalea | azalea leafminer | larva/moth | 1260-1500 |
| azalea whitefly | immature/adult | 1250-1500 |
Birch | birch skeletonizer | larva/adult | 1266-1580 |
| European hornet | adult wasp | 1388-2271 |
Black locust | locust leafminer | adult | 1029-1388 |
Black walnut | walnut caterpillar | larva | 1029-1514 |
Boxwood | boxwood leafminer | larva | 1200-2400 |
Butternut | walnut caterpillar | larva | 1029-1514 |
Conifers | aphids | nymph/adult | 900-2800 |
Deciduous plants | aphids | nymph/adult | 250-2800 |
| cottony maple scale | crawlers | 802-1265 |
| European fruit lecanium scale | crawlers | 1266-1645 |
| fall webworm | larva | 1266-1795 |
| Japanese beetle | adult | 1029-2154 |
| lace bugs | immature/adult | 1266-1544 |
| leafhoppers | immature/adult | 1266-1544 |
| tussock moths | larva | Not Available |
| twig pruner | adult | Not Available |
Dogwood | dogwood sawfly | larva | 1151-1500 |
Elm | elm leaf aphid | nymph/adult | 710-1500 |
| European elm scale | crawler | 1029-1388 |
| European fruit lecanium scale | crawler | 1266-1645 |
| twospotted spider mite | immature/adult | 1300-2000 |
Euonymus | euonymus scale | crawler | 780-820 |
Evergreens | lecanium scale | crawler | 1029-1388 |
Fruit trees (ornamental) | twospotted spider mite | immature/adult | 1300-2000 |
Hemlock | hemlock scale | crawler | 1388-2154 |
| hemlock woolly adelgid | nymph | Not Available |
Hickory | walnut caterpillar | larva | 1029-1514 |
Honeylocust | cottony maple scale | crawler | 802-1265 |
| honeylocust mite | immature/adult | 912-1514 |
Lilac | European hornet | adult wasp | 1388-2271 |
| lilac leafminer | moth/larva | 1388-1644 |
Linden | twospotted spider mite | immature/adult | 1300-2000 |
Maple | cottony maple scale | crawler | 802-1265 |
| greenstriped mapleworm | larva | 533-1645 |
| maple trumpet skeletonizer | larva | 1388-2032 |
Mountain laurel | azalea whitefly | immature/adult | 1250-1500 |
Oak | European fruit lecanium scale | crawler | 1266-1645 |
| oak spider mite | immature/adult | 802-1266 |
Pine | pine sawflies | larva | 246-1388 |
| pine webworm | larva | 802-2000 |
| redheaded pine sawfly | larva | Not Available |
| Zimmerman pine moth | moth | 912-1917 |
Privet | lilac leafminer | moth/larva | 1388-1644 |
| privet rust mite | immature/adult | 1266-1515 |
Rhododendron | azalea whitefly | immature/adult | 1250-1500 |
| European hornet | adult wasp | 1388-2271 |
Rose | twospotted spider mite | immature/adult | 1300-2000 |
Spruce | spruce bud scale | crawler | 912-1388 |
Taxus | cottony taxus scale | crawler | 802-1388 |
Taxus | Fletcher scale | crawler | 1029-1388 |
Tuliptree | tuliptree aphid | nymph/adult | 1151-1514 |
White pine | pine tube moth | larva | 1151-1514 |
July (late): Plants in bloom: Butterfly bush, Clethra alnifolia, false spirea | |
Apple | roundheaded appletree borer | adult | 1514-1798 |
Azalea | twobanded Japanese weevil | adult | 1644-2271 |
Birch | birch skeletonizer | larva/adult | 1266-1580 |
| European hornet | adult wasp | 1388-2271 |
Boxwood | boxwood leafminer | larva | 1200-2400 |
Broadleaved evergreens | twobanded Japanese weevil | adult | 1644-2271 |
Deciduous plants | European fruit lecanium scale | crawler | 1266-1645 |
| fall webworm | larva | 1266-1795 |
| Japanese beetle | adult | 1029-2154 |
| rust mite | immature/adult | 1644-2033 |
| tussock moths | larva | Not Available |
| twig pruner | adult | Not Available |
| twobanded Japanese weevil | adult | 1644-2271 |
Dogwood | dogwood sawfly | larva | 1500-? |
Douglas-fir | Cooley spruce gall adelgid | adult/immature | 1500-1775 |
Elm | elm leaf aphid | nymph/adult | 1500-? |
| European elm scale | crawler | 1400-? |
| European fruit lecanium | crawler | 1266-1645 |
| twospotted spider mite | immature/adult | 1300-2000 |
Hawthorn | roundheaded appletree borer | adult | 1514-1798 |
Hemlock | hemlock scale | crawler | 1388-2154 |
Honeylocust | honeylocust mite | immature/adult | 1500-2800 |
Juniper | juniper webworm | larva | 1645-1917 |
Lilac | European hornet | adult wasp | 1388-2271 |
| lilac leafminer | moth/larva | 1388-1644 |
Linden | twospotted spider mite | immature/adult | 1300-2000 |
Maple | greenstriped mapleworm | larva | 1645-? |
| maple trumpet skeletonizer | larva | 1388-2032 |
Mountain ash | roundheaded appletree borer | adult | 1514-1798 |
Oak | European fruit lecanium scale | crawler | 1266-1645 |
| oak spider mite | immature/adult | 1200-2000 |
Ornamental fruit trees | twospotted spider mite | immature/adult | 1300-2000 |
Pine | Nantucket pine tip moth | moth | 1514-1917 |
| pine needle scale | crawler | 1388-1917 |
| pine webworm | larva | 802-2000 |
| redheaded pine sawfly | larva | Not Available |
| Zimmerman pine moth | adult/larva | 912-1917 |
Privet | lilac leafminer | moth/larva | 1388-1644 |
| twobanded Japanese weevil | adult | 1644-2271 |
Rhododendron | European hornet | adult wasp | 1388-2271 |
| twobanded Japanese weevil | adult | 1644-2271 |
Rose | twospotted spider mite | immature/adult | 1300-2000 |
Shadbush | roundheaded appletree borer | adult | 1514-1798 |
Tuliptree | tuliptree aphid | nymph/adult | 1151-1514 |
Viburnum | viburnum leaf beetle | adult | 800-? |
Willow | willow twig aphids | nymph/adult | 1644-2271 |
August (early): Plant in flower: Hydrangea paniculata | | |
Birch | birch skeletonizer | larva/adult | 1266-1580 |
| European hornet | adult wasp | 1388-2271 |
Boxwood | boxwood leafminer | larva | 1200-2400 |
Broadleaved evergreens | twobanded Japanese weevil | adult | 1644-2271 |
Cherry/Peach | peachtree borer | larva | 1500-1800 |
Deciduous plants | aphids | immature/adult | 250-2800 |
| fall webworm | larva | 1266-1695 |
| Japanese beetle | adult | 1029-2154 |
| leafhoppers | immature/adult | 1266-1544 |
| rust mite | immature/adult | 1644-2033 |
| tussock moths | larva | Not Available |
| twobanded Japanese weevil | adult | 1644-2271 |
Douglas-fir | Cooley spruce gall adelgid | adult/immature | 1500-1775 |
Elm | twospotted spider mite | immature/adult | 1300-2000 |
Hemlock | hemlock scale | crawler | 1388-2145 |
Juniper | juniper webworm | larva | 1645-1917 |
Lilac | European hornet | adult wasp | 1388-2271 |
| lilac leafminer | moth/larva | 1644-? |
Linden | twospotted spider mite | immature/adult | 1300-2000 |
Maple | maple trumpet skeletonizer | larva | 1388-2032 |
Oak | oak skeletonizer | larva | 1798-2155 |
Ornamental fruit trees | pear sawfly | larva | Not Available |
| twospotted spider mite | immature/adult | 1300-2000 |
Pine | Nantucket pine tip moth | moth/larva | 1514-1917 |
| pine webworm | larva | 802-2000 |
| redheaded pine sawfly | larva | Not Available |
| Saratoga spittlebug | larva | Not Available |
| Zimmerman pine moth | moth/larva | 912-1917 |
Poplar | satin moth | larva | 1917-2271 |
Privet | lilac leafminer | moth/larva | 1644-? |
| twobanded Japanese weevil | adult | 1644-2271 |
Rhododendron | European hornet | adult wasp | 1388-2271 |
| twobanded Japanese weevil | adult | 1644-2271 |
Rose | twospotted spider mite | immature/adult | 1300-2000 |
Spruce | Eastern spruce gall adelgid | adult/immature | Not Available |
Tuliptree | tuliptree aphid | nymph/adult | 1514-? |
Viburnum | viburnum leaf beetle | adult | 800-? |
Willow | willow twig aphids | nymph/adult | 1644-2271 |
August (mid-): Plant fruit color: Mountain ash, cranberry bush | | |
Andromeda | azalea whitefly | immature/adult | 2032-2150 |
Azalea | azalea whitefly | immature/adult | 2032-2150 |
Birch | European hornet | adult wasp | 1388-2271 |
Boxwood | boxwood leafminer | larva | 1200-2400 |
Broadleaved evergreens | twobanded Japanese weevil | adult | 1644-2271 |
Cherry/Peach | peachtree borer | larva | 1800-? |
Deciduous plants | aphids | nymph/adult | 250-2800 |
| fall webworm | larva | 1695-? |
| Japanese beetle | adult | 1029-2154 |
| Japanese weevil | adult | Not Available |
| leafhoppers | immature/adult | 1544-? |
| tussock moths | immature/adult | 2145-2516 |
Elm | twospotted spider mite | immature/adult | 1300-2000 |
Flowering fruit trees | twospotted spider mite | immature/adult | 1300-2000 |
Hemlock | hemlock scale | crawler | 1388-2145 |
Lilac | European hornet | adult wasp | 1388-2271 |
Linden | twospotted spider mite | immature/adult | 1300-2000 |
Magnolia | magnolia scale | crawler | 2155-2800 |
Maple | sugar maple borer | adult | 2032-2375 |
Mountain laurel | azalea whitefly | immature/adult | 2032-2150 |
Oak | oak skeletonizer | larva | 1798-2155 |
Pine | redheaded pine sawfly | larva | Not Available |
| Saratoga spittlebug | adult | Not Available |
| Zimmerman pine moth | moth/larva | 1917-? |
Poplar | satin moth | larva | 1917-2271 |
Rhododendron | azalea whitefly | immature/adult | 2032-2150 |
| twobanded Japanese weevil | adult | 1644-2271 |
Rose | twospotted spider mite | adult | 1300-2000 |
Spruce | Eastern spruce gall adelgid | adult/larva | Not Available |
Tuliptree | tuliptree aphid | nymph/adult | 1514-? |
| tuliptree scale | crawler | 2032-2629 |
Willow | willow twig aphid | nymph/adult | 1644-2271 |
August (late): Plant fruit color: Viburnum dentatum | | |
Arborvitae | spruce spider mite | immature/adult | 2375-2806 |
Cedar | spruce spider mite | immature/adult | 2375-2806 |
Conifers | pales weevil | adult | Not Available |
Deciduous plants | tussock moths | larva | 2145-2516 |
Hemlock | spruce spider mite | immature/adult | 2375-2806 |
Juniper | spruce spider mite | immature/adult | 2375-2806 |
Larch | larch casebearer | larva | 2375-2805 |
Locust | locust borer | adult | 2271-2805 |
Magnolia | magnolia scale | crawler | 2155-2800 |
Maple | sugar maple borer | adult | 2032-2375 |
Pine | redheaded pine sawfly | larva | Not Available |
| spruce spider mite | immature/adult | 2375-2806 |
Spruce | spruce spider mite | immature/adult | 2375-2806 |
Tuliptree | tuliptree scale | crawler | 2032-2629 |
Willow | poplar-and-willow borer | adult | 2271-2806 |
| willow twig aphids | nymph/adult | 1644-2271 |
September (early): Plant fruit in color or flower: sweet autumn clematis, Polygonum aubertii |
Arborvitae | Fletcher scale | immature | 2515-2800 |
Cedar | spruce spider mite | immature/adult | 2375-2806 |
Conifers | pales weevil | adult | Not Available |
Deciduous plants | tussock moths | larva | 2145-2516 |
Hemlock | spruce spider mite | immature/adult | 2375-2806 |
Juniper | spruce spider mite | immature/adult | 2375-2806 |
Larch | larch casebearer | larva | 2375-2805 |
Locust | locust borer | adult | 2271-2805 |
Magnolia | magnolia scale | crawler | 2155-2800 |
Pine | pales weevil | adult | Not Available |
| spruce spider mite | immature/adult | 2375-2806 |
Spruce | spruce spider mite | immature/adult | 2375-2806 |
Taxus | Fletcher scale | immature | 2515-2800 |
Tuliptree | tuliptree scale | crawler | 2032-2629 |
Willow | poplar-and-willow borer | adult | 2271-2806 |
| willow twig aphids | nymph/adult | 1644-2271 |
September (mid-): Plant in flower: witchhazel | | |
Arborvitae | spruce spider mite | adult/egg | 2375-2806 |
Cedar | spruce spider mite | adult/egg | 2375-2806 |
Hemlock | spruce spider mite | adult/egg | 2375-2806 |
Juniper | spruce spider mite | adult/egg | 2375-2806 |
Larch | larch casebearer | larva | 2376-2805 |
Locust | locust borer | adult | 2271-2805 |
Magnolia | magnolia scale | crawler | 2155-2800 |
Pine | spruce spider mite | adult/egg | 2375-2806 |
Spruce | spruce spider mite | adult/egg | 2375-2806 |
Tuliptree | tuliptree scale | crawler | 2032-2629 |
Willow | poplar-and-willow borer | adult | 2271-2806 |