セジロウンカおよびトビイロウンカの成虫期の飼育条件による卵休眠の誘起

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The white back planthopper, Sogata furcifera, and the brown planthopper, Nilaparvata lugens, have been well known as very serious pests of the rice plant in Japan. For a long time, however, it has not been known where these species spent the winter. Recently, MIYAKE and FUZIWARA (1962) found experimentally that there were diapause in eggs of these species. It is interesting in relation to the problem of hibernation in both species. Since their paper seems to be insufficient in regard to the factor analysis of the induction of diapause in eggs of both species, the present author intended the experiments to make clear these uncertained points. 1. White back planthopper The adult just after the emergence was reared separately (one pair) or together (ten pairs) in a glass tube with supply of headed grass of Panicum crusgalli var. submutica under the photoperiod of 8 hours illumination and low temperature of 15℃. Then greater part of their deposited eggs entered into diapause, even if they spent their larval life under the condition of high temperature of 27.5℃, long day of 16 hours, and crowding, which is very favourable condition for their development. It is considered that the adult receives the stimuli of induction to diapause gradually, when they spent their adult life under the condition mentioned above. Because, preoviposition period of these adults was rather prolonged and the percentage of diapausing eggs was gradually increased with lapse of adult life. Most of the diapaused eggs stopped at the stage of eye pigmentation of their embryonic development. 2. Brown planthopper A similar result was also obtained in the brown planthopper. When the adults were reared separately in a rearing tube (one pair) feeding under short day of photoperiod and low temperature of 15℃, some of their deposited eggs were not hatched and their development was retarded, even though they spent their larval life under the condition of high temperature of 27.5℃, long day of 16 hours, high population density and leaf sheath of rice plant after heading as larval food. All of the retarded eggs were at the stage of yellow spot.
日本応用動物昆虫学会の論文
1963-12-25

セジロウンカおよびトビイロウンカの成虫期の飼育条件による卵休眠の誘起

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