Influence of Injury by Tea Green Leafhopper, Empoasca onukii MATSUDA on Leaves in New Shoots of Tea Plants

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  • チャノミドリヒメヨコバイの加害とチャ新葉の被害との関係
  • チャノミドリヒメヨコバイ ノ カガイ ト チャ シンバ ノ ヒガイ ト ノ カンケイ

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Influence of injury by Tea Green Leafhopper, E. onukii on browning of the leaf vein and growth of new shoots of tea plants was investigated.<BR>By the infestation of a middle-stage nymph for one day, the color of veins became brown. And after infestation for 4 days, veins had became brown in all shoots. However the number of shoots with the brown veins was lower by one female infestation than by a nymph one. By the infestation of a middle-stage nymph or a female, the brown veins was appeared from at the upper site of shoot to at the lower site.<BR>Stippling at the midrib were appeared by infestation of either a middle-stage nymph or a female for one day. And stippling of the leaf had been appeared more at the second and third leaves than the top leaf on the shoot. There was a significant correlation between the ratio of shoots with brown veins and the length of plucked new shoots, but not the weight of plucked new shoots.

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