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Crop and Pest Management Guidelines

A Cornell Cooperative Extension Publication
Page Contents
44001

5.2.2 DELAYED DORMANT

Pest(s)

Materials

Rate per Acre

Comments

5.2.2 DELAYED DORMANT

Soft scale insects and mealybugs

petroleum oil

2.5%

Apply early in the spring at bud swell but before any leaf tissue is exposed. Apply in 250 to 300 gallons of water. Thorough coverage is essential for good results. Avoid use with captan or sulfur due to phytotoxicity. Also avoid use within 24 hours before or after freezing temperatures. Field data indicate only short-term benefits for reducing mealybug populations. Oil more effective against soft scale.

OR

Knack

16 fl oz

Only labeled for lecanium scale. Can use oil with Knack at this time (delayed dormant). Not to exceed 32 fl oz/A for season.

Anthracnose, black rot, Phomopsis, powdery mildew

*NYMiller Lime Sulfur

1 gal/10 gal water

This spray is most likely to be beneficial on cultivars highly susceptible to anthracnose (e.g., Marquette, Reliance), where it can be important in blocks with a history of the disease, or in blocks where black rot and/or Phomopsis control is regularly problematic and conventional fungicides will not be used during the growing season. Otherwise, it is unlikely to be cost effective. THOROUGH coverage of the vines is essential for acceptable results. If practical, application to individual vines with a handgun or using some other system that minimizes loss of these expensive materials to non-grapevine surfaces (e.g., hooded-boom, recirculating sprayer such as the Lipco) is desirable. The low per-acre rate of *NYSulforix is unlikely to be effective unless loss to non-target surfaces is minimal. Use of more than 15 gal/A of *NYMiller Lime Sulfur is prohibitively expensive. For NYS users: note that *NYSulforix is only labeled for use against powdery mildew and Phomopsis and that*NYMiller Lime Sulfur is only labeled for control of Phomopsis, powdery mildew and anthracnose.

OR

*NYSulforix

1-2 gal

Anthracnose, black rot, Phomopsis, powdery mildew

OR

Howler

2.5-7.5 lbs

OR

Romeo

0.23 lbs

OR

Stargus

0.5-4.0 qts

Stargus has shown to be more effective when tank mixed with Regalia.

KEY FOR SECTION 5.2:

* Federal restricted-use pesticide*NY Restricted-use pesticide in New York State

† Not for use in Nassau/Suffolk Counties.^ Not registered for use in New York State at press time