Raspberry Herbicide Options Throughout the Season – August 2015

by Kristen Obeid, Weed Management Program Lead – Horticulture

Below is a table that provides herbicide options for new and established raspberry plantings. Each row in the table provides rotation options for your management program.

Note: only apply herbicides when needed. This table is an example of timing the various herbicides registered in raspberries depending if you have summer or everbearing varieties.

Note: Herbicide Group Numbers in brackets below which are important for rotation purposes to prevent resistance development.  

Why Use One Herbicide Over Another:

Preemergence Herbicides

Casoron (Group 20) – long residual good on winter annuals and some perennials. Can be applied very late in the fall / winter, as long as the ground is not frozen.

Devrinol (Group 15) – expensive at labeled rates, good to moderate control of annual grasses and broadleaves; moderate control of groundsel. Spray only once per season in the fall or spring before weeds emerge.

Princep Nine-T (Group 5) – great on annual grasses and broadleaves.

Sinbar (Group 5) – will also burn off small seedlings. Controls a large number of weeds including harder to control annuals and winter annuals: annual sowthistle, common chickweed, purslane, dandelion, henbit and yellow wood sorrel. However, may cause phytotoxicity. To avoid injury use low rates, lowest on sandy soil.

Postemergence Herbicides

2,4-D (Group 4) – Apply at any time during the year except during bloom. Keep off of new shoots. Do NOT spray more than two applications. Higher rates can be used for spot applications to control dandelions and other perennial weeds.

Gramoxone (Group 22) – direct spray at the base of canes in the spring before new shoots emerge or in the fall when canes are mature. Gramoxone is a non-selective herbicide that will control all green plants.

Poast and Venture (Group 1) – for grass control. Ensure application is made at the appropriate leave stage for the various grass weeds. Do NOT substitute other surfactants.