農薬施用の異なる水田の畦畔におけるカメムシ群集の多様性

概要

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Species diversity of heteropteran communities was investigated in the border vegetation of two paddy fields, the one (Site A) cultivated with insecticides and herbicides, and the other (Site B) with mowing and without spraying agrochemicals, in southern Ibaraki Prefecture, from May to October of 2000. A total of 73 species from 17 families were collected at the two sites, 44 species from 14 families and 56 species from 15 families from Sites A and B, respectively. Twenty-seven species were common to both sites with a similarity index (QS) 0.54. The species diversity (H´) was higher in Site B (4.26) than in Site A (3.61). The population density (93.7 individuals/sampling on the average) and fluctuations were low in Site B, while the density (330.3) was high and showed a rapid decrease after spraying herbicide and a marked increase after harvest in Site A. The rate of brachipterous species was higher in Site B (12.5 and 15.9% for numbers of species and individuals, respectively) than in Site A (6.8 and 0.6%), while the rate of species causing "pecky rice" was higher in Site A (54.5 and 80.6%) than in Site B (35.7 and 5 1.7%). The results suggest that the incidence of pecky rice can be kept low even in paddy fields cultivated without herbicide application.
日本応用動物昆虫学会の論文
2002-05-25