ミナミアオカメムシの幼虫集団の大きさと死亡率,令期間およびふ化・脱皮の斉一性

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  • The Effect of Colony Size upon the Survival of Larvae of the Southern Green Stink Bug, <i>Nezara viridula</i>
  • ミナミアオカメムシ ノ ヨウチュウ シュウダン ノ オオキサ ト シボウリツ , レイ キカン オヨビ フカ ダッピ ノ セイイツセイ エイブン

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Experiments were conducted to assess the effect of aggregation of larvae upon the developmental rate and mortality in the southern green stink bug, Nezara viridula. Each experiment was set up with eggs from one batch of eggs within 24hrs. after deposition. One egg mass was divided into the following groups, 1, 2, 5, and 10 eggs with replications of 10, 5, 2, and 1, respectively. Larvae were fed with the potato plant or the pods of the common haricot beans.<br>A good synchronization was observed in both hatching and moulting among the first and the second instar larvae reared in a group of 10. Difference in the duration of each instar was observed in regard to the group size except the first instar. The duration of the second instar became short as the group increased in size, and the reverse relationship was observed for the fourth and the fifth instars. The daily mortality of the second instar was the highest among the isolated larvae and decreased successively to the lowest with the increase of the group size. On the contrary, the daily mortality became the highest in the fifth instar in the crowded culture being accompanied with a prolongation of the pertinent stage. The total duration of the larval stage, however, differed little due to the inverse relation with the grouping between early and late stages. But the total mortality among isolated larvae was three times as high as that of the group of 2 individuals which had the least mortality. In most cases, the decrease in the body weight of the newly emerged adults was significant at a level of 99 per cent confidence with the increase in size of a group.<br>Factors involved in the determination of the colouration of the larvae seemed to be multiple, and it was suggested that at least the population density besides temperature was responsible for the variation of the body colour. The survival value of larval aggregation under natural conditions was briefly discussed.

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