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Bacteria, fungi, and algae differ in their responses to pesticides; responses are often related to the biochemical mechanisms of action of the pesticide and pesticide concentrations in the soil. Total microbial populations in soils are often unaffected or only slightly affected by pesticide applications, but populations and activities of individual species or groups (e.g. cellulose decomposers) of microorganisms may be greatly affected. Pesticide concentrations greater than those resulting from field applications can cause interruption of microbial activities and shifts in populations. Most pesticides used at field rates do not appear to cause significant lasting effects on the microbial activities most related to soil fertility. Methods for interpreting the responses of microorganisms treated with pesticides are discussed. In general, the changes in microbial populations due to pesticide applications are no more severe than changes caused by natural environmental stresses. The effects of pesticides on crop residue decomposition, nutrient cycling, and root symbi‐onts are reviewed with respect to production practices.
Thomas B. Moorman (Sun,) studied this question.