Abstract
To examine the effects of pesticides on insect biodiversity, a population survey was conducted in conventionally managed, low-input, and organic peach orchards. Pitfall traps were used to sample a total of 6489 insects representing 151 species at seven study sites. Results of a population survey suggest that pesticide application adversely affected insect biodiversity in peach orchards and that the magnitude of the adverse effect might be greater for herbicide application than for insecticide application. The usefulness of carabids and ants as biological indicators of the effects of pesticides was also evaluated. Results suggest that the ant species Tetramorium tsushimae is a good indicator in peach orchards. In contrast, carabids are not suitable indicators.
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