Oviposition of Torymus sinensis Kamijo (Hymenoptera : Torymidae under Natural Conditions)

概要

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Most of the parasitoids which emerged from the withered galls of Dryocosmus kuriphilus in spring of 1990 in Tsukuba, Japan were Torymus sinensis, an introduced parasitoid of D. kuriphilus, that was released in 1982. Fresh galls formed in the same period were dissected to examine the oviposition of T. sinensis in the field. Oviposition started on 8 April and lasted for about one month. A time lag was 13 days between the peak of female emergence and that of its oviposition. Females randomly oviposited in each larval chamber before the peak of oviposition and the oviposition became concentrated later. More than one egg were found among 31.6% of the chambers examined. Most of the eggs, 87.4%, were laid in the chamber with a live larva of D. kuriphilus, while superparasitism was observed at 7.8% of the eggs laid. As an ovipositing site, the body surface of the host was much more selected (67.5%) than the surface of the chamber wall or in the chamber wall tissue. Female adults of T. sinensis killed 11.9% of the host larvae on an average by their host-feeding. Mean survival rate of D. kuriphilus larvae was only 0.8% after the ovipositing period of T. sinensis. Adult females live estimated at least 37 days in the field.
日本昆虫学会の論文
1999-09-25