Influence of injury by tea green leafhopper, Empoasca onukii Matsuda on leaves in new shoots of tea plants
2000
Kosugi, Y. (Shizuoka-ken. Tea Experiment Station, Kikugawa (Japan))
Influence of injury by Tea Green Leaf hopper, E. onukii on browning of the leaf vein and growth of new shoots of tea plants was investigated. 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. 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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