WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Wednesday, December 12, 2018

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5039. Parker, R. and A.G. Ogg. undated. Crop bioassay for herbicide residues.. WSU Cooperative Extension Bulletin EB 1417.
A method for assessing herbicide carryover damage potential is outlined. Each sample requires 10 lb of soil from representative parts of a field. A non-treated check sample is advisable. Indicator plants are grown in containers for about 3 weeks. A chart of herbicides and the appropriate indicator plant is included. Where a susceptible crop must be planted, activated charcoal can be added to the soil as a spray and worked in. Rates range from 100-800 lb/ac depending on the chemical and the crop to be grown.

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