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The effects of two successive annual treatments of imidacloprid and fipronil on dragonfly nymph communities, which are one of the best-known bioindicators in Japanese agroecosystems, were monitored in experimental paddies. e abundance of dragon y nymphs was lower in both insecticides-treated elds than it was in the controls, particularly following pronil treatments. Residues of both insecticides were found in the soil throughout the two years, and imidacloprid persisted in water up to three months following each treatment. A Principal Response Curve analysis (PRC) showed that the second annual treatments caused greater structural changes in dragon y nymph communities than the initial treatments caused, particularly for pronil. e community structures continued to change even a er the insecticides dissipated from the water. is suggests that ecological impacts, and therefore risks, of imidacloprid and pronil on dragon y nymph communities depend more on soil residues than they do on waterborne residues. As expected, susceptibility of dragonfly nymphs to these two insecticides differed among species. © Pesticide Science Society of Japan

nihon noyaku gakkaishi

Effects of two successive annual treatments of two systemic insecticides, imidacloprid and fipronil, on dragonfly nymph communities in experimental paddies