キャベツ畑における主要りんし目害虫の個体群動態の比較研究

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  • Comparative Studies on the Population Dynamics of Important Lepidopterous Pests on Cabbage
  • キャベツバタケ ニ オケル シュヨウ リンシモク ガイチュウ ノ コタイグン ドウタイ ノ ヒカク ケンキュウ 2
  • 2. On the Habits of Oviposition of <i>Pieris rapae crucivora, Plusia nigrisigna</i> and <i>Mamestra</i> (<i>Barathra</i>) <i>brassicae</i> on Cabbage Plants
  • 2. モンシロチョウ,タマナギンウワバおよびヨトウガのキャベツ株内での産卵部位

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1. In this paper the writer gave an account of observations on the habits of oviposition of Pieris rapae crucivora, Plusia nigrisigna and Mamestra brassicae on cabbage plants.<br>2. These species deposit their eggs on all leaves of young plants but only on the leaves of middle and upper parts in aged plants. However, even in aged plants, Pieris rapae crucivora and Plusia nigrisigna deposit some eggs on the lower leaves when the density of adults in the field is high.<br>3. Almost all of the eggs of Pieris rapae crucivora were deposited on the under surface of leaves. But a few were deposited on the upper surface of the middle and upper leaves in the third and fourth brood. The latter fact is probably due to the increasing number of eggs deposited on a plant; i.e., about one quarter of the eggs per plant were on the upper surface at the time of peak oviposition in the fourth brood. Similar results were obtained in Plusia nigrisigna, though the number of eggs deposited on the upper surface showed no such close correlation with that on the under surface as in Pieris rapae crucivora.<br>4. Mamestra brassicae usually deposit their egg-masses on the under surface of the leaves, and an egg-mass deposited on lower leaf contains more eggs than those on upper leaf.<br>5. Pieris rapae crucivora and Plusia nigrisigna showed a tendency to deposit their eggs on the leaves in every direction in a plant. On Mamestra brassicae, the obtained results did not ascertain this point.

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