夏秋季,海岸植生上にみられるコブノメイガ,シロオビノメイガ成虫集団 2. 1989年におけるシロオビノメイガ調査

抄録

Moths of the rice leaf roller, Cnaphalocrocis medinalis GUENEE and the Hawaiian beet webworm, Hymenia recurvalis FABRICIUS resting on seashore vegetation are found annually along the Hyuga coast during the summer and autumn. These moths appear to be a temporary landed population in the course of migratory flight. In 1989, H. recurvalis moths were collected from seashore vegatation using an insect net. The collected moths were sexed and were classified according to the deficency of cilia which occur on the outer margin of the fore wing to clarify the freshness of the moth. Furthermore the female moths were dissected under a binocular microscope to examine both the ovaries and spermatophores. Fresh moths accounted for more than 90% of the collected moths. About 90% of the ovaries of female moths were either undeveloped or partially developed and the mating rate was 12.8%. In contrast, female moths collected at the breeding site were sexually mature and had already mated. The mating rate of female moths was highly correlated with the percentage of mature moths.