From the Pacific Northwest Weed Management Handbook published by Oregon State University. Edited by Diane Kaufman and Ray William
BLACKBERRIES AND RASPBERRIES—Established Plantings—Directed Applications in Berry Rows
• paraquat Gramoxone Max |
Rate Consult label Time Apply late winter or early spring before new shoots emerge, or late summer or fall after training new canes. Remarks Adjust spray volume to thoroughly wet weeds. Add a nonionic surfactant or crop oil concentrate according to label specifications, taking care to avoid anionic formulations that react in the tank to form insoluble precipitates. Caution A restricted-use pesticide. Do not ingest or inhale spray mist. Wear protective face shields, respirators, and clothing. (Acts as a contact; absorbs energy produced by photosynthesis, forming peroxides that disrupt living cells.) |
• glyphosate numerous product names blackberries only |
Rate Consult labels Time Apply to actively growing weeds. Remarks Avoid treatments in late summer when sugars move toward crown. Select application equipment to prevent crop injury by directing spray, or use low-pressure hand-held sprayers or selective applicators. Adjust concentration depending on equipment. Consult label about rate and time of application, especially for perennial weeds. Mixing additional surfactant or ammonium sulfate as label instructs may improve control of slightly stressed weeds. Preharvest interval is at least 14 days. If repeat applications are necessary, do not exceed a total of 10.6 Ib ai/A in 1 year. Caution Grazing is prohibited. In raspberries, the herbicide moves throughout the plant; excessive injury prevents labeling and use in this crop. Repeated glyphosate applications have created resistant biotypes of ryegrass in Australian orchards. To avoid weed resistance, rotate and mix weed control practices. (Inhibits production of three amino acids and protein synthesis.) |
• glyphosate several products blackberries only |
Wiper: 33% solution Remarks Mix 1 gal product with 2 gal water and wipe weeds, avoiding contact with desirable vegetation. In severe infestations, reduce equipment ground speed or apply in two directions to ensure contact with wiper. (See remarks above.) |
• sethoxydim Poast |
Rate 0.28 to 0.47 Ib ai/A (1.5 to 2.5 pints product/A) Time . Apply at optimum growth stage listed on the label by add 2 pints/A nonphytotoxic crop oil concentrate to improve leaf absorption. Remarks Identify susceptible grasses. Control often is erratic if grasses are stunted or stressed from drought, high temperatures, or low fertility. Resistant grasses include annual bluegrass and all fine fescues, whereas quackgrass can be suppressed. Caution Do not apply within 45 days of harvest, nor exceed 5 pints/A per season. (Inhibits fatty acid production, cell membranes, and new growth.) |
