On the relation between the chemical components of the leaves of Citrus natsudaidai Hayata and the population density of Unaspis yanonensis Kuwana

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  • Nohara Keigo
    Entomological Laboratory, Faculty of Agriculture, Kyushu University
  • Tasaka Toshio
    Entomological Laboratory, Faculty of Agriculture, Kyushu University

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  • ヤノネカイガラムシの寄生頻度と夏橙の葉成分との関係について
  • ヤノネカイガラムシ ノ キセイ ヒンド ト ナツダイダイ ノ ハ セイブン ト ノ カンケイ ニ ツイテ

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Citrus leaves were analyzed for nitrogen, phosphorus, potassium, calcium, magnesium and manganese contents to find a correlation between the position of leaves and the population density of Unaspis yanonensis, one of the most injurious scale insects of citrus in Japan. The experiments reveal that the amount of N, P, Ca, Mg and Mn is higher in the leaves on which the population density of the scale insect is higher and the amount of K is higher on the leaves on which the scale insect is fewer. The leaves of the crown part of citrus contain larger amount of N, P, Ca, Mg and Mn than the leaves found in the middle part of the tree. This fact coincides with the severe damage of the crown part of citrus caused be Unaspis yanonensis in the groves and would suggest that the leaves of larger amount of K are not suitable for the physiological condition of the growth of scale insects.

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