Effect of soil‐injected benomyl on resident earthworm populations

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Abstract
Soils pressure‐injected with benomyl (36 g/m2) ¼ 1, 2 or 3 years previously or at 18 g/m2 4 years previously were examined to determine the earthworm populations. Earthworms that emerged within 20 min following a soil drench with formalin were counted. A significant reduction in the earthworm population occurred soon after benomyl treatment; however, within months the earthworm population increased substantially. The earthworm populations in plots treated with benomyl one or more years previously did not differ significantly from untreated plots.