POPULATION FLUCTUATIONS AND SPATIAL DISTRIBUTIONS OF NATURAL ENEMIES OF APHIDS IN CORN FIELDS

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  • トウモロコシ畑における食蚜性天敵類の個体数消長と空間分布
  • トウモロコシ畑における食〔カ〕性天敵類の個体数消長と空間分布
  • トウモロコシバタケ ニ オケル ショクカセイ テンテキルイ ノ コタイスウ ショ

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Abstract

Population fluctuations and spatial distributions of natural enemies of aphids were investigated in unsprayed corn fields. The densities of the aphids, Rhopalosiphum padi, R. maidis and Macrosiphum akebiae, were very low in the study areas and their spatial distributions were highly contagious regardless of the size of sampling unit. Natural enemies (coccinellids, syrphids, lacewings, etc.) were abundant in the years when the densities of the aphids were high, but they did not show any clear tendency to aggregate on localities of higher densities of the aphids, and in particular the distribution patterns of adults and larvae of the enemies were mostly random or uniform. The abundance of the enemies seemed to be sufficient for suppressing the aphid populations, and it also seemed that the natural enemies affected the spatial distribution patterns of the aphids. The environments in the unsprayed corn fields without weed control seemed to facilitate the action of the natural enemies.

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