Weed Management Handbook

clethodim (Select Max)

Rate 0.07 to 0.12 lb ai/A (9 to 16 oz/A Envoy Plus)

Time Apply postemergence to actively growing annual or perennial grasses as listed on label.

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 hr after application may reduce effectiveness. Inhibits production of three amino acids and protein synthesis.

flazasulfuron (Mission)

Oregon and Washington only

Rate 0.033 to 0.045 lb ai/A (2.14 to 2.85 oz/A)

Time Pre- and postemergent to broadleaf and grass weeds up to 4 inches tall, and before grasses tiller.

dichlobenil (Casoron 4G)

Rate 4 to 6 lb ai/A (100 to 150 lb/A Casoron 4G)

Time Apply midwinter, immediately before a cold rain, to reduce volatility and enhance weed suppression.

clethodim (Select Max, Envoy, and others)

Nonbearing crop only

Rate 0.068 to 0.121 lb ai/A (9 to 16 fl oz/A Prism)

Time Apply to actively growing grass weeds, including annual bluegrass, at growth stage listed on label.

isoxaben (Trellis)

Rate 0.495 to 0.998 lb ai/A (0.66 to 1.33 lb/A Trellis)

Time Apply after harvest in fall until 6 months before the next harvest, or immediately after cultivation, to debris-free soil sur- face.

glyphosate (numerous product names)

Rate 0.47 to 4.5 lb ai/A (11 oz to 3.3 quarts/A Roundup Power Max)

Time Apply to weeds at least 10 days before planting the crop.

Remarks Use highest rate on field bindweed. Rain within 6 hours after application may reduce effectiveness. Inhibits produc- tion of three amino acids and protein synthesis.

Floor management practices significantly affect vineyard growth and vigor, and more so in young vineyards. If left uncontrolled, weeds can reduce new vine biomass by more than 80%. Weed control also helps to conserve soil moisture for the grapevines.