CLETHODIM

Trade name(s) Prism, Select, Envoy, Volunteer, Arrow, Section, Trigger, SelectMax, Shadow, Intensity

Manufacturer(s) Valent, Tenkoz, Albaugh, Arysta, Winfield, Loveland

Formulation(s) 0.94, 0.97 and 2 lb/gal emulsifiable concentrate

Remarks A selective postemergence grass-control herbicide. Controls most annual and perennial grasses except fine fescues. Using a crop oil concentrate enhances activity.

Storage conditions Stable

Acute toxicity LD50 - 2,920 mg/kg

Action in plant Inhibits growing points in grasses.

Site of action Group 1: acetyl CoA carboxylase (ACCase) inhibitor

Chemical family Cyclohexanedione

Strawberries

Joe DeFrancesco
Revised March 2015

Weed control practices in strawberries must be timed to coincide with the crop’s nonreproductive phases, or when minimal herbicide uptake can be expected. Strawberries can be induced into a nonreproductive “summer dormancy” by withholding water and fertilizer after harvest. Beds can be renovated by mowing old leaves, cultivating row middles, and sometimes by applying a herbicide. In mid-August, plants are fertilized and watered to enhance flower bud development. Soil-applied herbicides can be applied at full rates in the fall.

Cranberries

Kim Patten
Revised March 2015

Preplant weed control All major weed problems can be prevented by starting with a clean field and avoiding reinfestation.

Blueberries, Gooseberries, Currants, and Elderberries

Joe DeFrancesco and Ed Peachey
Revised March 2015

BLUEBERRIES, GOOSEBERRIES, CURRANTS, AND ELDERBERRIES—Weed and Vegetation Management

Mulches contribute significantly to weed control if constructed and maintained properly. Even without the benefit of weed control, blueberries grow well under mulch because they are shallow rooted and lacking root hairs. A layer of mulch over the soil conserves soil moisture for blueberries.

Blackberries and Raspberries

Joe DeFrancesco
Revised March 2015

BLACKBERRIES AND RASPBERRIES—Site Preparation

glyphosate (numerous product names)

Rate Consult labels

Remarks Apply to weeds at least 10 days before planting crop. Use highest rate on field bindweed. Do not apply if weeds are stressed by drought, weather, or maturity. Rain within 6 hours after application may reduce effectiveness. Inhibits production of three amino acids and protein synthesis.

Vineyards and Grapes

Ed Peachey
Revised March 2015

(Note: Some clones may be sensitive to certain herbicides)

GRAPES—Weed and Vegetation Management

General strategy Vegetation management in vineyards is determined by site-specific environmental factors. Weed competition and interference must be minimized within the row while trafficability and soil conservation are required between rows (see “Section L. Vegetation Management in Orchards, Vineyards, and Berries” in this handbook).

Tree Fruits and Nuts

Ed Peachey
Revised March 2015

Pome fruits: apples and pears

Stone fruits: apricots, peaches, nectarines, cherries, prunes, plums

Nuts: hazelnuts, walnuts, and chestnuts

Quick Reference Guide to Herbicides Labeled for Use in Fruit and Nut Crops

Sugar Beets

Don Morishita
Revised March 2015

Note All rates listed are stated as broadcast equivalent (i.e., the amount that would be required for weed control if broadcast sprayed between rows as well as in the row). If sugar beet herbicides are applied in a band, the amount required for 1 acre of beets can be calculated as: broadcast equivalent x (band width ÷ distance between rows).

SUGAR BEETS—Annual Grass and Broadleaf Weeds

dimethenamid-P (Outlook)

Potatoes

Pamela J.S. Hutchinson
Revised March 2015

POTATOES—Volunteer Grain, Weed, or Grass Cover Crop Control before Planting Potatoes

carfentrazone (Aim EC)

Rate Up to 0.031 lb ai/A (2 fl oz Aim EC)

Time Apply before potatoes have been planted.

Mint

Rick Boydston
Revised March 2015

MINT—Annual Grass and Broadleaf Weeds in New Plantings and Established Crop

napropamide (Devrinol 50 DF, Devrinol DF-XT, Devrinol 2XT)

Rate 4 lb ai/A (8 lb/A product)

Hops

Rick Boydston
Revised March 2015

HOPS—Annual Grass and Broadleaf Weeds

flumioxazin (Chateau SW)

Rate 0.19 lb ai/A (6 oz/A product).

Time Apply to dormant hops January thru March in a 1- to 1.5-foot band to each side of the hop row. Rain following application will improve preemergence weed control.

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