2018 Crop Protection Guide for Tree Fruits in Washington

Chemical Weed Control

Sunday, February 17, 2019

Seasonal Weed Control on Stone Fruit

See General Recommendations for guidelines on table use. Read all product labels carefully.



Except where noted, rates are amount per acre (active ingredient per acre) 
Alion 1.67

3.5-6.5 fl oz (0.045-0.085 oz AI)

12 h

14 d

Casoron 4G
dichlobenil; cherries only

100-150 lb (4-6 lb AI)

12 h


Goal 2XL

2-6 pt (0.5-1.5 lb AI)

24 h



1-3 pt (0.5-1.5 lb AI)

24 h


Kerb 50W

2-6 lb (1-3 lb AI)

24 h


Matrix FNV

4 oz (1 oz AI)

4 h

14 d

Prowl H2O

2-4 qt (1.9-3.8 lb AI)

24 h

60 d

Solicam 78.6DF

2.5-5 lb (2-3.9 lb AI)

12 h

60 d

Surflan AS

2-6 qt (2-6 lb AI)

24 h



Alion 1.67: WSSA Group 29: inhibits cellulose biosynthesis, disrupts cellulose formation in the cell wall.

Alion is labeled for the pre-emergence control of many annual grasses and broadleaf weeds. The weed control spectrum is affected by application rate and the timing of activation. Tank mix partners can also increase the range of weed control. Will not control established perennials or emerged annuals. Standing weed vegetation must be managed with a post-emergence herbicide. Excessive crop residue or leaf litter may also reduce efficacy. Apply to trees established for at least three years. Apply as a uniform broadcast or banded application to dry soil surface that does not have cracks or depressions. Do not use on sand or soils containing >20% gravel. Alion should not be applied to frozen or snow covered soils or saturated soils. Light irrigation or rain within three weeks is necessary for incorporation. Spring applications are more effective if glyphosate was used in the previous fall or late summer to control perennial weeds. Avoid direct contact with foliage, green bark, or roots. A well-maintained and level vegetated buffer strip of 25 ft or more will help reduce runoff.

Casoron 4G: WSSA Group 20: inhibits cellulose biosynthesis, disrupts cellulose formation in the cell wall

A soil-active herbicide for long-term or seasonal control of most weeds. Dichlobenil can suppress the growth of some perennials (Canada thistle, quackgrass, field bindweed and bermudagrass), although higher use rates are recommended. Dichlobenil can be applied where weeds are present. Can be used in non-bearing orchards, as long as trees have been established for at least four weeks. More effective when applied in the fall when the soil is cool and still not frozen. Application before a rain will reduce volatility and improve weed suppression. Weigh and distribute over precisely measured area to ensure accurate application. Follow label directions closely for springtime applications. For use in cherries, only. Grazing of livestock is prohibited.

Goal 2XL: WSSA Group 14: protoporphyrinogen oxidase (PPO) inhibitor

Provides both pre-emergent and early post-emergent control of broadleaf weeds in dormant orchards. May require a tank-mix partner for the control of grass species. It is most effectiveas a post-emergence when the seedling weeds have less than four leaves. Post-emergence weed control can be improved by tank-mixing with appropriate partners and adjuvants. Apply as a banded application to bare soil under healthy trees. Do not apply after tree buds start to swell or when foliage or fruits are present. Avoid direct plant contact. Overhead moisture within 3 to 4 weeks will enhance pre-emergence herbicide activity. Alternate trade name: Galigan 2E. Do not apply more than 3 lb ai oxyfluorfen per acre per year from any combination of applications of GoalTender, Goal 2XL or any product containing oxyfluorfen. Grazing is prohibited.

GoalTender : See comments for Goal 2XL.

Kerb 50W: WSSA Group 3: microtubule assembly inhibitor

Pronamide is a soil-applied product that is used for the control of grasses (annuals and some perennials) and some broadleaved species.  It is most effective on cool season grasses. Pronamide can control some small weeds that have emerged. Pronamide should be applied in the fall after harvest, but before leaf drop and soil freeze up to trash-free soil. Use the lower rates for annual grasses and susceptible broadleaf weeds; use the higher rates for controlling quackgrass. Use rate will also be affected by soil texture; use lower rates on coarse soils. Rainfall or overhead irrigation is required following application. Soil temperatures above 55°F may result in reduced weed control.Do not apply around seedling trees less than 1 year old or fall-transplanted trees established less than 1 year or spring transplanted trees established less than 6 months. Grazing of livestock is prohibited.

Matrix FNV: WSSA Group 2: acetolactate synthase (ALS) inhibitor

Matrix has both pre-emergence and very early post-emergence activity. To broaden the weed control spectrum and/or extend the residual effectiveness rimsulfuron may be tank-mixed with other registered herbicides having a different mode of action.  Tank mixes well with Alion. For maximum pre-emergence activity, the herbicide should be applied to a soil surface that is smooth and relatively free of crop and weed trash. Rainfall or irrigation is required within 2 weeks of application for pre-emergence incorporation. Susceptible weeds are controlled from 60 to 90 days after application. For best results, maintain spray tank solution at pH 5 to 7. Avoid contact with green bark, foliage, or fruit.

Prowl H2O: WSSA Group 3: microtubule assembly inhibitor

Pendimethalin is a pre-emergence herbicide that is particularly effective against grasses. Often used in combination with other residuals to broaden the spectrum of weed control. Pendimethalin should be applied to weed-free soil. Delay application to newly planted trees until ground has settled and no cracks are present. May be surface applied pre-emergence or surface incorporated; see label regarding application and incorporation instructions and timing. If applying before transplanting, do not allow treated soil to come into contact with roots. Contact with leaves, shoots, buds, or fruit may cause injury. The use rate is determined by the weeds requiring control and the length of control needed. Use lower rate for 4 month control and higher rate or 6-8 months control. Grazing of livestock is prohibited.

Solicam 78.6DF: WSSA Group 12: inhibits carotenoid biosynthesis

Norflurazon effective against annual grasses and some broadleaf weeds, but is not commonly used except as a partner with another product that can broaden the weed control spectrum. May suppress, but not control, Equisetum (field horsetail, scouring rush). Solicam does not have any post-emergence weed control activity. Solicam can be applied from fall to early spring to non-frozen soil before the weeds emerge. The soil should be settled and firm at the time of application and the surface must be free of soil clods, depressions, weeds and other plant residue. Requires moisture within 4 weeks of application to activate. Trees must be established in orchard at least 18 months. Make only one application per year. Repeated applications over a period of years may result in tree injury if rates are not reduced after the first season. Not labeled for cherries on gravelly, sand or loamy sand soils because of potential for tree injury; death of young cherry trees has occurred under these conditions. Grazing of livestock is prohibited.

Surflan AS: WSSA Group 3: microtubule assembly inhibitor

Surflan is a pre-emergence herbicide that is particularly effective against annual grasses and some broadleaved weed species. Oryzalin should be applied to weed-free soil or with an approved post-emergence herbicide when established weeds are present. Approved tank-mix partners can increase the spectrum of weed control. Delay application to newly planted trees until ground is settled. Requires rain or irrigation to activate herbicide. Shallow cultivation can control newly germinated weeds without reducing herbicide activity. Lower rate is for 4 month's control; higher rate for 8–12 months. Alternate trade name: Oryzalin 4AS. Grazing of livestock is prohibited.


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