Studies on the Varietal Differences of Plant in the Insect Infestation by Means of Rearing Insects on Seedlings

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  • 幼苗飼育による虫害の品種間変動に関する研究
  • ヨウビョウ シイク ニ ヨル チュウガイ ノ ヒンシュ カン ヘンドウ ニ カンスル ケンキュウ 2
  • II. Growth Response of <i>Chilo suppressalis</i> Larvae to Rice Seedlings of Several Varieties
  • 第2報 胚乳栄養期幼苗供試無菌飼育によるニカメイチュウ発育の稲品種間変動

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Abstract

The present work was undertaken to determine if varietal differences of rice plant in the rice stem borer resistance were estimated by means of rearing larvae on newly germinated seedlings of several rice varieties. Larvae of the rice stem borer were reared aseptically on steam-sterilized rice seedlings, of 12 to 13 varieties, which were nourished with albumen alone, and growth rate of larvae and pupal weight were recorded.<br>There was a negative correlation between the heading date inherent of respective varieties and the percentage pupation during the rearing period, while the body weight of pupae grown on seedlings of late-heading varieties was heavier than that of pupae on seedlings of early-heading varieties. The body weight of pupae grown on the varieties of the heavy-ear type was heavier than that of pupae on the multi-ear type varieties.<br>This suggests that it may be possible to compare the rice stem borer resistance among rice varieties by means of this aseptic rearing method using newly germinated seedlings. If it is true, this method will be appreciated as convenient for testing the insect resistance in rice plant and for breeding new resistant varieties, because it is able to rear the borer larvae in small space in a short period, regardless of the rice culture season.

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