- 1). Use products containing glyphosate for effectively killing a raspberry bush with roots, as recommended by the Washington State University Extension. Buy undiluted, water-soluble formulas as these have greater efficacy than the esters.
- 2). Spray the foliage of the raspberry bush from all sides. This is referred to as foliar treatment and is effective for bushes up to 15 feet tall.
- 3). Cover the plant from all sides, but do not drench the foliage to the point of runoff. Do not use herbicide on very hot days or on plants that are severely drought stressed. Glyphosate is most effective when used during August and September.
- 4). Avoid the use of herbicide if there is a chance of rain within six hours of treatment. Repeat application after seven to 10 days.
- 5). Cut the dead bush down to the stump using an ax and remove the debris. Dig out the stump with a hoe or shovel and discard the waste.
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