タマナギンウワバおよびその近似種(ヤガ科)の生態に関する研究

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  • 一瀬 太良
    東京農工大学農学部農業昆虫学研究室
  • 渋谷 成美
    東京農工大学農学部農業昆虫学研究室 庵原農薬株式会社研究所

書誌事項

タイトル別名
  • Studies on the Bionomics of the Asiatic Common Looper, <i>Plusia nigrisigna</i> WALKER and Its Several Allied Species (Noctuidae)
  • タマナギンウワバ オヨビ ソノ キンジシュ ヤガカ ノ セイタイ ニ カンスル ケンキュウ 2
  • II. Effects of Temperatures on the Development of the Asiatic Common Looper, <i>Plusia nigrisigna</i> WALKER
  • II. タマナギンウワバの発育に及ぼす温度の影響

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抄録

In the present paper, the authors wish to discuss the effects of various temperatures on the development of the Asiatic common looper, Plusia nigrisigna WALKER. The eggs were obtained from laboratory breedings. They were reared in incubators regulated at 25°C and 30°C. Some of the materials were bred in rooms with various temperatures, i.e. about 14°C, 22°C and 28°C.<br>Observations were made on the developmental velocities of all the stages and on the longevities of adults. The larvae were bred under crowded (20 individuals per container) or solitary condition.<br>1. The developmental zero points in the crowded culture supplied with burdock leaves as diet, were 8.0°C for the eggs, 8.0∼9.6°C for the larvae and 12.4°C for the pupae, and the total effective temperatures were calculated as 66.7, 223.6 and 101.8 day degrees respectively. The effects of various temperatures upon the duration of developmental stages are given in Tables 1 and 2.<br>2. The males and females showed no significant difference in their developmental velocity under a moderate condition. Different from the case of Plusia gamma (LONG, 1953), no crowding effects were observed in this species (Tables 4 and 5).<br>3. The ordinary moulting numbers of the larvae were four, but five moultings frequently occurred. However, it seems that temperatures do not play a decisive rôle in the induction of the increase of moulting numbers (Tables 6 and 7).<br>4. The longevities of adults supplied with sugar solution as a diet were 17 days in an average at about 22°C and 9 days at about 28°C. Sexual difference was not observed (Table 8).<br>5. The development of this species belongs to multivoltine type, showing no sign of diapause at any stage. It is supposed from the law of total effective temperature that there can be five generations a year at Fuchû district in Tokyo (Table 9).

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