The Effects of Group Size on Survival of Early-Instar Larvae of the Fall Webworm, Hyphantria cunea DRURY (Lepidoptera, Arctiidae) in Laboratory and in the Field

概要

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The effects of aggregation on survival of early-instar larvae of Hyphantria cunea were examined in the laboratory and field. There was little difference in the survival and growth of the larvae among various group sizes in the laboratory. The group size to ensure the initial feeding of hatchlings was about 10 individuals. On the other hand, the group size to ensure the high survival rate of larvae was more than 100 individuals on mulberry tree which was the most suitable host plant in the field. Comparing the survival rates of the larvae in various colony sizes on various host plants in the natural population, the colony size to ensure the high survival rate of the larvae was more than 250 individuals. When the colony size increased, the colonial-web was more compact so that it seemed to be more protective to larvae from abiotic mortality factors and predation, although the predators concentrated to large colonies. When the larval colony had such large group size that establishment mortality did not occur, the larvae constructed a compact colonial-web, which gave the protection to larvae from severe mortality pressure.
日本昆虫学会の論文
1981-06-25