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Studies on the arthropod associations in paddy fields with particular reference to insecticidal effects on them part 3 effect of insecticide application on the faunistic composition of arthropods in paddy fields



Studies on the arthropod associations in paddy fields with particular reference to insecticidal effects on them part 3 effect of insecticide application on the faunistic composition of arthropods in paddy fields



Kontyu 46(4): 603-623



In Tokushima Prefecture, Shikoku [Japan], the effects of insecticide application on arthropod fauna in rice fields was investigated in 1955 by comparing the faunistic composition in several areas sprayed with BHC and parathion from 1951-1955. As an index of the intensity of insecticide application (IIA), the percentage of the cumulative acreage of sprayed area to the total acreage of rice fields was employed. Different intensity of insecticide application was reflected on the diversity of the faunistic composition, which was expressed as the relative number of individuals belonging to different taxa or of phytophagous and carnivorous species. Significant decreases in Orthoptera and Odonata occurred where IIA exceeded 25% and 50%, respectively. In areas where IIA exceeded about 80%, decrease of Araneae and increase of leaf- and plant-hoppers were significant. Decrease of Hymenoptera occurred where IIA exceeded 120%. Higher composition rate of phytophagous arthropods and lower composition rate of carnivorous arthropods were found where insecticides were sprayed intensively.

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Accession: 006513583

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