訪花コクゾウの季節的消長

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タイトル別名
  • Seasonal Fluctuation of the Number of the Flower-Visiting Rice Weevil, <i>Sitophilus oryzae</i> LINNÉ
  • チョコクガイチュウ ノ セイタイガクテキ ケンキュウ エイブン 4
  • The ecological studies of the pests infesting stored grains. Part 4.
  • 貯穀害虫の生態学的研究 第4報

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The seasonal trend of the number of rice weevils visiting flowers was investi-gated in Miyazaki from 3rd April to 6th June in 1956.<br>It is concluded that the rice weevils begin to visit flowers in early April and cease in late May or early June in the southern Kyushu. The number of flowervisiting weevils seems to be determined both by the conditions of flowers and by weather. The surprisingly abundant individuals of weevil visit flowers in farm district.<br>The rice weevils increase their reproductive rate and seem to elongate their longevity when suck nectar. If the weevils having greater reproductive rate and elongated longevity return to farms after the harvest of crops, the habit of flower-visiting becomes very important from practical standpoint of pest control.<br>The flower-visiting of the rice weevils in spring is a common phenomenon and is important for a life cycle of the weevils in the southern Kyushu.

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