コブノメイガ幼虫の齢数に及ぼす飼育温度とイネの葉質の影響

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  • Influence of the Temperature and the Growing Stages of the Rice Plant on the Number of Larval Instars in the Rice Leaf Roller, <i>Cnaphalocrocis medinalis</i> GUENÉE
  • コブノメイガ ヨウチュウ ノ レイスウ ニ オヨボス シイク オンド ト イネ

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To investigate some of the factors which may influence the number of instars, larvae of Cnaphalocrocis medinalis, were reared at different temperatures on rice plant leaves at various growing stages. Three types of larvae were observed: those which reached the 5th instar, 6th instar, and occasionally 7th instar, respectively. At 17.5-30.0°C, most of the larvae developed to the 5th instar, while at 15.0°C, which is close to the threshold temperature of larval development, 38 percent of the larvae passed through 6 instars. Most of the larvae reared on the young leaves of the rice plant developed to the 5th instar. The apperance rate of the 6th instar larvae increased as the growing stage of the host plant advanced and 83 percent of the larvae developed to the 6th instar when they were reared on the rice plants at the ripening stage. The developmental periods of 5th and 6th instar larvae reared on leaves at the ripening stage were about 3 and 5 days longer respectively, compared with those of larvae reared on young leaves. In the case of the 5th instar type larvae, increase in the period of development occurred at each instar. The mean growth rate of the head capsule width of the 5th and 6th instar types was 1.45 and 1.36 respectively. The frequency distributions of the width of head capsules showed two peaks corresponding to the different instars mentioned above. From these results, it is thought that the frequency of the moulting of the larvae in the paddy fields is more affected by the growing stages of the rice plant than by the temperature, and that the thermal constant increases with the stage of the host plant.

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