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 1
  • 1. Seasonal Fluctuations in the Numbers of Eggs of the Common Cabbage Butterfly, <i>Pieris rapae crucivora</i> (BOISDUVAL), the Asiatic Common Looper, <i>Plusia nigrisigna</i> WALKER, and the Cabbage
  • 1. モンシロチョウ,タマナギンウワバおよびヨトウガの産卵数の季節的変動

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The common cabbage butterfly, Pieris rapae crucivora (BOISDUVAL), the Asiatic common looper, Plusia nigrisigna WALKER, and the cabbage armyworm, Barathra brassicae LINNÉ are important lepidopterous pests on cabbage in Japan.<br>The writer made a series of observations on the population dynamics of these insects at Hirosaki, near the northern tip of Honshu, throughout the season from mid-April to mid-October in 1959.<br>In the present paper, the results of observations on the seasonal fluctuation in the numbers of eggs of these species deposited on cabbage plants are described. The following table would be made as the summary of the main results of this paper.<br>The peak of oviposition in these species did not overlap each other throughout the season.<br>A comparison was made on the number of eggs deposited on a plant between two cabbage-fields of different areas: a narrow one with 20 plants and the other with about 400 plants. It was found that both Pieris rapae crucivora and Plusia nigrisigna deposited their eggs more numerously on a plant in the narrow field than in the wide one. And reversed tendency was observed on Barathra brassicae; more eggs on a plant were found in the wide field than in the narrow one.

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