リンゴコブアブラムシの生殖力におよぼすジベレリンの影響

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  • The Reproductive Capacity of the Apple Leaf-Curling Aphids (<i>Myzus malisuctus</i> MATSUMURA) Reared on Gibberellin-Treated Apple Trees
  • リンゴコブアブラムシ ノ セイショクリョク ニ オヨボス ジベレリン ノ エイキョウ エイブン

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The experiment was undertaken to determine whether or not reproduction of the apple leaf-curling aphids was affected by the use of gibberellic acid. For this purpose of the study four treatments of gibbereliin were applied on apple seedlings under fluctuating temperature and fluctuating light conditions in a net house. From the over-all arguments, it is concluded that higher level of gibberellic acid was requierd in order to effect a significant reduction in aphid populations. Beyond any doubt, such differences will appear on the differences of the nutritional basis rather than on direct plant growth. In this respect, analyses of reducing and total sugars of apple foliages proved that the reducing sugar was lowered down in the treated plants despite no apparent effect was detected in total sugar. This close linkage between the aphid development and plant nutrition is probably due to the gibberellin application.

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