From the Pacific Northwest Weed Management Handbook published by Oregon State University. Edited by Diane Kaufman and Ray William

   • diuron

several products

Rate 1.6 to 2.4 Ib ai/A

Time Apply in winter as single application or apply half-doses in October and March.

Remarks Reduce rate or rotate to other herbicides after effective weed control is achieved. Sprinkler irrigate if applied before fall rains begin. Spray soil around base of plant avoiding crop foliage. Can be rotated with simazine or other herbicides (except terbacil) to reduce weed shifts. (Inhibits photosynthesis.)

Caution Do not use within 1 year after planting nor on plants being tip layered. Do not apply on very sandy or gravelly soils.

   • simazine

Princep

Rate 1.6 to 4 Ib ai/A

Time Apply in winter as single application or apply half-doses in October and March.

Remarks Reduce rate or rotate with other herbicides after effective weed control is achieved. Requires surface moisture for activation. Apply half rate on plants less than 6 months old. Can be rotated with diuron or other herbicides (except terbacil) to reduce weed shifts. (Inhibits photosynthesis.)

   • terbacil

Sinbar

Rate 0.8 to 1.6 Ib ai/A

Time Apply higher rate on fine-texture soils or soils high in organic matter in fall or early spring before fruit set while weeds are small.

Remarks Sprinkler irrigate if rain does not follow application within 2 weeks. Reduce rates by as much as one-half or rotate with other herbicides after weed control is effective. Calibrate sprayer and apply with tractor-mounted, fixed-boom sprayer using a constant speed and rate of delivery.

Caution Do not apply on gravelly soils or soils containing less than 1% organic matter, nor on weak plants or eroded areas with exposed roots. Avoid use for 2 years when replanting is anticipated. Can be rotated with diuron or other herbicides (except simazine) to reduce weed shifts. Do not apply within 70 days of harvest. (Inhibits photosynthesis.)

   • norflurazon

Solicam

Rate 2.5 to 5 Ib ai/A

Time Apply as a directed spray from fall to early spring before weeds emerge and when crop is dormant.

Remarks Soil surface must be weed free and relatively free of plant residues or debris. Apply only once per year. Temporary bleaching or chlorosis may occur.

Caution Do not apply to nursery stock. (Inhibits yellow pigment formation, causing bleaching of green chlorophyll.)

   • dichlobenil

Casoron

Rate 4 Ib ai/A (100 lb/A granular)

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

Remarks Weigh and distribute uniformly exact quantities over precisely measured areas to ensure accurate applications. In thornless evergreen blackberries, apply October through December 1 but never on light-texture, sandy soils. Oregon results over 9 years suggest perennial weeds can be suppressed with 4-, 3-, and 2-Ib ai/A rates applied during 3 consecutive years.

Caution Grazing livestock is prohibited. (Inhibits cellulose and cell wall formation.)

   • napropamide

Devrinol

Rate 4 Ib ai/A

Time Apply in fall through spring before weeds germinate or apply foliar-active herbicide to control existing vegetation.

Remarks Irrigation or shallow incorporation is recommended for treatments made November through February, if no rain falls within 2 weeks after application. Irrigate within 24 hours to wet soil 2 to 4 inches deep when applied March through October. Excessive plant residues on soil surface reduce performance. (Inhibits root growth.)

   • oryzalin

Surflan

Rate 2 to 6 lb ai/A

Time Apply late fall or early spring to bare soil or after existing vegetation has been destroyed by tillage or use of a foliar-active herbicide.

Remarks Use higher rates or split treatments and apply in fall and spring for longer residual control. Irrigate with at least 0.5 inch water or rain to activate herbicide. Shallow cultivation can provide control of newly germinated weeds without reducing herbicide activity. Allow 24 months before planting vegetables following berries. (Inhibits mitosis, primarily in roots.)