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Table 58. Weed Management in Grapes

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Table 58. Weed management in Grapes.
Preemergence
Weed Problem Material Rate/Acre (phi) Comments and Limitations
Annual and perennial grasses and broadleaves (dichlobenil)
Casoron CS
Casoron 4G
Group 20


1.4-2.8 gal (0)
100-150 lb (0)

Perennial weeds: Apply from Nov. 15 to Feb. 15 as a soil surface application. Can also be applied in late fall or early spring before May 1 and incorporated immediately.
Annual Weeds: Apply in early spring after cultivation before weeds emerge. Rain or irrigation is needed for activation. A shallow incorporation is recommended. Apply 4 weeks after transplanting after soil has completely settled.
Annual grasses and broadleaf weeds (indaziflam)
Alion 1.67
Group 29

3.5-5 oz
Only use Alion in established vineyards at least 5 years after planting and exhibiting normal growth and good vigor.  Apply as a directed spray to the base of the plants.  Ensure that the grapes have been planted at least 12 inches deep and that there is 12 inches of soil barrier between the soil surface and the major portion of the root system priot to using or injury may occur.  Do not use on grapes grown on sand or on soils with more than 20% gravel content.  More than one application can be made but do not exceed 5 oz/acre and allow a minimum of 90 days between applications.  Ideally use this product in the fall or in the spring prior to weed emergence.  Does not control perennial weeds.  See label for specific rates.
Annual broadleaves and suppression of grasses (flumioxazin)
Chateau SW
Group 14
6-12 oz (60) Do not apply after bloom unless with a hooded or shielded application. Apply alone preemergence or tank mix with Roundup or Gramoxone postemergence. Do not incorporate.
Do not allow drift to contact foliage or green bark. Always add a crop oil at 1% v/v or nonionic surfactant at 0.25% v/v. Max. rate is 24 oz per season. Min. 30 days between applications. Chateau also has postemergence activity.
Age restriction: Do not apply to vines established less than 2 years unless they are trellised at least 3 ft from the ground or are protected by nonporous wraps, grow tubes, or waxed containers.
(diuron)
Karmex 80DF
Group 7
2-6 lb (0) Age restriction: Use on vineyards established at least 3 years and trunks at least 1.5 inches diameter. Apply as a directed spray to soil under trellis in early spring prior to weed germination. Max. 1 application per year. On soils low in organic matter (1-2%), severe injury may result if heavy rainfall occurs soon after treatment.
(simazine)
Princep 4L
Group 5
 
2-4.8 qt (0) Age restriction: Apply to soil under trellis between harvest and early spring before weeds emerge. Use on vineyards established at least 3 years. Apply alone to weed-free soil or tank mix with Roundup or Gramoxone. Max 1 application per year.
(rimsulfuron)
Matrix FVN
Group 2
4 oz (14) Apply as a banded application to the base of the vines. Best results are obtained when the soil is moist at the time of application and 0.5 inch of rainfall or sprinkler irrigation occurs within 2 weeks after application.
Age restriction: Do not apply to vines established less than one year. PHI=14 days.
Annual broadleaves and suppression of grasses cont. (oxyflourfen)
Goal 2XL
Group 14
5-8 pt (b) Dormant application only: effective both preemergence and postemergence as a directed spray on weeds less than 4 inches. Do not apply from bud swell to harvest. Can be mixed with other preemergence herbicides, or with Roundup or Gramoxone. Max rate is 8 pt/A/year.
Age restriction: Do not apply to grapes established less than 3 years unless vines are on a trellis wire a minimum of 3 ft above ground.
Most broadleaves (isoxaben)
Gallery 75DF
Group 21
0.66-1.33 lb (1yr) Non-bearing only: May only be used on crops that will not be harvested within one year of application. Apply in late summer to early fall; or in early spring prior to weed germination or anytime immediately after cultivation. Do not apply to new transplants until soil has settled with no cracks present. Rainfall or irrigation of 0.5 inch is needed within 21 days of application. Not effective on germinated weeds. Min. 60 days between applications. Max rate is 4 lb/A.
Annual and perennial grasses and certain broadleaves (pronamide)
*Kerb 50WP
Group 3
2-8 lb (c) Apply as a directed spray in the fall after harvest prior to soil freeze-up, or early winter when temperatures are below 55˚F. Rainfall or irrigation are required to activate. Max. 1 application per year and 8 lb/A/year. Kerb also has early postemergence activity. Rate depends on soil texture.
Annual grasses and certain broadleaves (pendimethalin)
Prowl 3.3EC
Prowl H2O
Group 3
2.4 qt (1 yr) Non-bearing only: May only be used on crops that will not be harvested within one year of application. Do not apply if buds have started to swell . May be applied preplant incorporated, preplant surface, or preemergence. For best results, rain or irrigation is needed within 21 days of application. Not effective on germinated weeds. Do not allow spray to contact leaves, shoots, or buds. For new plantings, do not apply until soil has settled and no cracks are present.
(napropamide)
Devrinol 50DF
Group 15
8 lb (35) Apply from late fall (prior to soil freeze-up), to early spring (prior to weed emergence). If no rainfall of 1 inch or more occurs within 24 hours after treatment, cultivate or irrigate to activate. Apply alone to weed-free soil or in tank mix with Roundup or Gramoxone. Do not allow spray to contact fruit or foliage.
(oryzalin)
Surflan 4AS
Group 3
2-6 qt (0) Make a single band or broadcast spplication to the ground beneath vines before weeds emerge. Apply alone to weed-free soil or postemergence mixed with Roundup or Gramoxone. Min 0.5 inch of rainfall or irrigation is required for activation. Min 2.5 month between applications. Max rate is 12 qt per year.
Annual grasses and broadleaves and suppression of yellow nutsedge (norflurazon)
Solicam DF
Group 13
1.25-5 lb (60) Apply as a directed spray to settled and firm soil from fall to early spring before weeds emerge. Rainfall or irrigation is needed within 4 weeks of application. Do not contact fruit of foliage. Do not apply after bud break on sandy loam soils. Check label for maximum amount allowed per year depending on soil type.
Age restriction: Allow a minimum of 24 months after planting before first application.
Postemergence
Weed Problem Material Rate/Acre (phi) Comments and Limitations
Annual broadleaves (carfentrazone)
Aim 2EC
Group 14
1-2 oz (3) Apply any time during the season. Always add nonionic surfactant at 0.5% v/v or crop oil at 1% v/v. Mix with Roundup or Gramoxone or labeled preemergence herbicides for broader weed control. Max. 7.9 oz/A/year. Min. 14 days between applications.
Sucker management: Apply when suckers are green. Do not allow spray to contact desirable fruit, foliage, or green bark.

(pyraflufen ethyl)
Venue 1.7
Group 14
 

1 - 4 oz (0)

Apply as a directed spray to the base of the vines.  Can be used in-season, postharvest, dormant, or pre-bloom.  Provides contact burn down of existing broadleaf weeds.  Do not make more than 2 applications or exceed 6.8 oz/acre during the growing season.  Do not make more than 2 applications or exceed 6.8 oz/acre during the off-season.  Non-ionic surfactant at 0.5 to 2% is recommended.  Larger weeds will require the highter rate.  Avoid contact with green, uncallused bark of young vines established less than one year.  See label for other precautions.
Sucker control: Apply at a rate of 3 to 4 oz/acre.  Do not make more than 2 applications or exceed 6.8 oz/acre during the growing season.  Avoid contact with green, uncallused bark of young vines established less than one year.  See label for other precautions.

(oxyflourfen)
Goal 2XL
Group 14
5-8 pt (b) See “Preemergence” section for details.
Most annual and perennial grasses (flauzifop)
Fusilade DX
Group 1
16-24 oz (1yr) Non-bearing only: May only be used on crops that will not be harvested within one year of application. Apply as a directed spray to actively growing grasses before tillering. Always add crop oil at 1% v/v or nonionic surfactant at 0.25% v/v. Avoid contact with foliage. Rainfast in 1 hour. Max rate is 72 oz/A/year. Min. 5 days between applications.
(clethodim)
Select 2EC
Group 1
6-8 oz (1yr) Non-bearling only: May only be used on crops that will not be harvested within one year of application. Apply as a directed spray to actively growing grasses before tillering. Do not use if rain is expected within 1 hour. Always add nonionic surfactant at 0.25% v/v. Do not use crop oil. May be applied as a spot treatment at 0.32-0.64 oz per gallon. Max rate is 32 oz/A/year.
(sethoxydim)
Poast 1.5EC
Group 1
1.5-2.5 pt (50) Apply as directed spray to actively growing grasses before tillering. Always add crop oil at 1% v/v. Max 2.5 pt per application and 5 pt/A/year.
Annual and perennial grasses and broadleaves (glufosinate)
Rely 1L
Group 10
3-6 qt (14) Age restriction: Do not apply within 1 year of transplanting. Apply as a directed spray to actively growing weeds. Do not apply on desirable foliage or drift on foliage, green, or uncallused bark of vines. Max 18 qt/A/yr for bearing and 12 qt/A/yr for non-bearing vines. For spot applications, mix 1.5-4 oz per gallon.
Sucker control: a split application approximately 4 weeks apart at 4 qt/A is recommended or spot spray with 3 oz/gallon of water. Suckers should not exceed 12 inches long.
(pelargonic acid)
Scythe 4.2E
Fatty acid Group
3-10% solution (0) For contact nonselective control or burndown of a broad spectrum of actively growing weeds. Use low rate for annual weed control and high rate for maximum vegetative burndown. Use as a directed spray or shielded spray. Can be mixed with Roundup.
Most annual grasses and broadleaves and top kill of perennial weeds (paraquat)
*Gramoxone SL 2.0
*Firestorm 3SC
Group 22

2.5-4 pt (0)

1.3-2.7 pt
Apply as directed spray to actively growin gweeds. Repeat applications are necessary to give sustained control. Avoid contact with desired new whoots, fruit or foliage. Apply as a coarse spray. Always add nonionic surfactant at 0.25% v/v or crop oil at 1% v/v. Best results with flat fan nozzles. Max. 5 applications per year.
Sucker management: Apply when suckers are less than 8 inches tall. Do not allow spray to contact desirable fruit, foliage, or green bark.
Annuals and some perennial grasses and broadleaves (glyphosate)
Roundup Ultra 4EC
Group 9
1-5 qt (14) Rate depends on weed species and stage of growth. See label for details. Apply as preplant broadcast application or in fall for control of roots and rhizomes of perennial weeds or as a directed spray or wiper application (20-100% solution) to actively growing weeds in established plantings. Always add ammonium sulfate 8.5-17 lb/100 gal in hard water or drought conditions (see label). Do not allow spray to contact any part other than mature bark. Does not provide residual control; can be mixed with labeled preemergence herbicides.
Where brand names for chemicals are used, it is for the reader’s information. No endorsement is implied, nor is discrimination intended against products with similar ingredients. Please consult pesticide product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.
*Restricted use pesticide; pesticide applicators license required. OMRI listed for organic production