Crop and Pest Management Guidelines

A Cornell Cooperative Extension Publication
34163

6.7 Specialty Use Herbicides

34433

CASORON 4G

CASORON 4G (dichlobenil) - read the label

Signal word: CAUTION

Medical emergency: (866) 928-0789

Selected uses: Preemergence control of annual broadleaf weeds, early season control of annual grasses, and suppression or control of some perennial weeds.

Rate: Apply 100-150 lb per acre surface treated for annual weed control, or 150 lb per acre for control of established perennial weeds.

Timing: For annual weed control, apply in the spring prior to germination. For perennial weed control, apply between November 15 and February 15. For new plantings, do not apply before 4 weeks after planting.

Comments: Casoron is unusual among preemergence herbicides in that it controls many perennial as well as annual weeds. It is relatively expensive at recommended use rates and requires specialized equipment for application, so it is rarely used in vineyards. Limited experience in New York suggests season-long control of annual grasses might not be achieved. Spot treatment of Casoron might be useful in areas with problematic perennial weeds.

34434

DEVRINOL 50-DF

DEVRINOL 50-DF (napropamide) - read the label

Signal word: CAUTION

Medical emergency: (800) 858-7378

Selected uses: Preemergence control of annual grasses and some annual broadleaf weeds in bearing and nonbearing vineyards.

Rate and timing: See the Devrinol section under "Herbicides for nonbearing vineyards."

Comments: Devrinol is recommended for use during vineyard establishment (with appropriate caveats) where herbicide options are limited; it is also labeled for use in bearing vineyards. Ragweed and other common annual broadleaf species are not controlled with Devrinol, and season-long control of annual grasses is not usually achieved, so Devrinol is not often used in established vineyards.

34435

KERB 50W

*KERB 50W (pronamide) - RESTRICTED-USE PESTICIDE - read the label

Signal word: CAUTION

Medical emergency: (800) 992-5994

Selected uses: Pre- and postemergence control of annual and perennial grasses in bearing and nonbearing vineyards established six months or more. Fall applications only.

Rate: Apply 2-8 lb per acre surface sprayed.

Timing: Apply in the fall after harvest but before the soil freezes.

Comments: *Kerb is somewhat unusual among soil-active herbicides used in vineyards; sensitive weeds absorb it through the roots and it is effective in controlling both annual and perennial grasses and some annual broadleaf weeds. The label states that use on soils with more than 4 percent organic matter may result in incomplete weed control. Degradation of the active ingredient occurs when soil temperatures reach 55°F, so season-long control of susceptible weeds is unlikely. Effective perennial grass control can also be achieved with systemic post emergence herbicides such as glyphosate, and several preemergence herbicides can provide season-long control of annual grasses.

34436

SCYTHE

SCYTHE (pelargonic acid) - read the label

Signal word: WARNING

Medical emergency: (888) 478-0798

Selected uses: Postemergence burndown of all weeds in bearing and nonbearing vineyards; repeat applications necessary for larger annual weeds and for perennials.

Rate: Use a 3-5% solution for small annual weed burndown. Use a 5-10% solution for larger weeds and burndown of mature perennial weeds. Registered as a sucker control agent as well as a postemergence herbicide. Injury to sprayed weeds is evident within several minutes. Weed control is optimal when weeds are thoroughly covered. To attain this, the recommended spray volume is 75-200 gal per acre sprayed.

Timing: May be applied whenever weeds are actively growing. Repeat applications are necessary for large weeds and perennials that continue to emerge from underground parts.

Comments: Avoid application to any desirable green tissue, as injury will result. Strong odor can linger for several hours or days. Observe applicator precautions carefully.

34437

SNAPSHOT 2.5 TG

^SNAPSHOT 2.5 TG (trifluralin plus isoxaben) - read the label

Signal word: CAUTION

Medical emergency: (800) 992-5994

Selected uses: Preemergence control of annual grasses and broadleaf weeds and, at the high use rate, suppression of some perennial weeds (including field bindweed) in nonbearing vineyards only. ^SNAPSHOT IS NOT REGISTERED FOR USE IN NEW YORK STATE.

Rate: Apply 100-200 lbs per acre surface treated. For use only on nonbearing vines that will not bear fruit for at least one year. Repeat applications of 150 lbs per acre and higher should not be made within 60 days of a previous application.

Timing: Apply prior to weed germination or just after cultivation. The active ingredient, trifluralin, is quite volatile and uniform incorporation by rainfall or cultivation should occur within three days of application, otherwise annual grass control may be erratic. Do not apply within one year of harvesting fruit.
Comments: ^Snapshot is a pre-mix of trifluralin (Treflan) and isoxaben (^Gallery) used more commonly in ornamentals. Where volatility is a concern, or where uniform granular applications are not possible, tank-mix ^Gallery (where legal) with an effective grass herbicide such as oryzalin (Surflan, Oryzalin), pendimethalin (Prowl, ^Pendimax), or Devrinol.

34438

TREFLAN

TREFLAN, others (trifluralin) - read the label

Signal word: CAUTION

Medical emergency: (800) 992-5994

Selected uses: Applied and incorporated prior to planting new vineyards for preemergence control of annual grasses and broadleaf weeds.

Rate: Depends on the formulation used and on soil texture and organic matter- consult the label.

Timing: Apply and incorporate within 24 hours of application prior to planting.

Comments: Local experience with these products is extremely limited, as other options are more practical.

34439

WEEDZSTOP, BIO-WEED

WEEDZSTOP, BIO-WEED, several others (corn gluten meal)

Signal word: N/A

Medical emergency: N/A

Selected uses: Preemergence control or suppression of annual weeds in bearing and nonbearing vineyards.

Rate: Apply 20 lb per 1,000 sq ft (870 lb per acre surface applied). Can only be applied as a granular material.

Timing: Apply in the spring and the fall.

Comments: An organic product derived from cornmeal production. Contains about 10% soluble nitrogen, so at recommended use rate supplies about 87 lbs. actual nitrogen per acre surface treated. Although herbicidal activity has been observed in some greenhouse studies, little if any weed control efficacy has been observed in trials on turf conducted in New York. For those interested in trying it, a small evaluation trial is advised before large-scale applications are made.

34164

Table 6.7.1 Herbicides and their basic characteristics for New York and Pennsylvania vineyards. (Read the label for potential tank mixes and specific use, rate and timing of each product.)

 Common Name

 Herbicide Trade Name

 (C)ontact or (S)ystemic

 Young Vine Use

 Non-bearing Only

 Application Timing

 Weeds Controlled

 Sucker Control

 Pre-emergent

 Post-emergent

 Broad-leaves

 Grasses

 Broad Spectrum

 carfentrazone-ethyl

 Aim

 C

 x

 -

 -

 x

 x

 -

 -

 x

 clethodim

 *NYSelectb

 S

 x

 x

 

 x

 -

 x

 -

 -

 dichlobenil

 Casoron G

 S

 xc

 -

 x

 x

 -

 -

 x

 -

 

 Casoron CS

 S

 xf

 -

 x

 x

 -

 -

 x

 -

 diuron

 Karmex, Direx

 -

 -

 -

 x

 -

 -

 -

 x

 -

 fluazifop-P-butyl

 Fusilade DX

 S

 x

 x

 -

 x

 -

 x

 -

 -

 flumioxazin

 Chateau

 -

 x

 -

 x

 -

 -

 -

 x

 -

 glufosinate-ammonium

 †Rely, †Rely 280

 C/Sa

 x

 -

 -

 x

 -

 -

 x

 x

 glyphosate

 Roundup, Touchdown

 S

 x

 -

 -

 x

 -

 -

 x

 -

 indaziflam

 *NY†Alion

 C

 -

 -

 x

 -

 -

 -

 x

 -

 isoxaben

 ^Gallery

 -

 x

 x

 x

 -

 x

 -

 -

 -

 napropamide

 Devrinol

 -

 x

 -

 x

 -

 -

 x

 -

 -

 norflurazon

 †Solicam

 -

 -

 -

 x

 -

 -

 x

 -

 -

 oryzalin

 Surflan, Oryzalin

 -

 x

 -

 x

 -

 -

 x

 -

 -

 oxyfluorfen

 Goal, GoalTender

 -

 -

 -

 x

 -

 x

 -

 -

 -

 paraquat

 *Gramoxone

 C

 x

 -

 -

 x

 -

 -

 x

 x

 pelargonic acid

 Scythe

 C

 x

 -

 

 x

 -

 -

 x

 x

 pendimethalin

 ^Pendimax 3.3EC

 -

 x

 x

 x

 -

 -

 x

 -

 -

 

 Prowl 3.3 EC

 -

 x

 x

 x

 -

 -

 x

 -

 -

 

 Prowl H2O

 -

 -

 -

 x

 -

 -

 x

 -

 -

 pronamide

 *Kerb

 S

 xd

 -

 x

 x

 -

 x

 -

 -

 rimsulfuron

 Matrix

 -

 xf

 -

 x

 -

 -

 -

 x

 -

 sethoxydim

 Poast

 S

 x

 -

 -

 x

 -

 x

 -

 -

 simazine

 *NY†Princep

 -

 -

 -

 x

 -

 x

 -

 -

 -

 trifluralin

 Treflan

 -

 xe

 -

 x

 -

 -

 x

 -

 -

 trifluralin + isoxaben

 ^Snapshot

 -

 x

 x

 x

 -

 -

 -

 x

 -

 * Federal restricted-use pesticide; may be purchased and used only by certified applicators or used by someone under the direct supervision of a certified applicator.

 *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

 a Primarily contact, limited systemic activity

 b Note maximum annual use rate restriction for Long Island

 c Do not apply within 4 weeks of planting

 d Do not apply within 6 months of planting

 e Usually used pre-plant incorporated

f Vines must be established one full growing season

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