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

概要

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Moths of the rice leaf roller, Cnaphalocrocis medinalis GUENEE, and the Hawaiian beet webworm, Hymenia recurvalis FABRICIUS resting on seashore vegetation (containing no host plants) were periodically collected with an insect net at the coast of Hyuga, Miyazaki Prefecture, in 1987 and 1988. H. recurvalis moths were also collected at two sites. One site was on host plant, Amaranthus lividus L. The other site was on non-host plants, consisting mainly of grassy weeds in vegetable fields where host plants were abundant, in 1988. Both species of moth were counted separately and sexed. Female moths were dissected to examine the number of spermatophore. Both species were found from mid August; C. medinalis was observed until late October. H. recurvalis was observed until early November. There was no difference found in the sex ratios of the two species collected. The mating rate ranged from 8.0% to 20.9% in C. medinalis and from 9.4% to 19.6% in H.recurvalis) indicating a low level of sexual maturity. The movements of both species were observed on August 31,September 1,September 26 and September 27 at the seashore vegetation site. Moths took off within half an hour after sunset. Both species were found on the following day at the same site. In the vegetable fields the mating rate of H.recurvalis on the host plant ranged from 11.4% to 92.3% depending on the date of collection. The mating rate of non-host plants, however, varied from 63.0% to 100%, with an average of 81.5% during the autumn. This indicated that the female moths on non-host plants were more sexually mature and differed markedly from the moths on seashore vegetation. No difference was found in the sex ratio of moths found on non-host plants. These results suggest that both species found on seashore vegetation might be temporarily landed populations in the course of migration flight, and that H.recurvalis might also be a migrant as is C. medinalis.
1990-02-25

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

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概要

論文 | ランダム

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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

スポンサーリンク

概要

論文 | ランダム

スポンサーリンク

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