茶園のクワシロカイガラムシに対するピリプロキシフェンマイクロカプセル剤の散布が摘採収量に及ぼす影響

抄録

We evaluated the effects of pyriproxyfen application for mulberry scale, Pseudaulacaspis pentagona (Targioni), on the plucking yield of tea crop. Three treatments including pyriproxyfen applied in March 2010, DMTP applied in May 2010, and a control treatment were tested in a tea field. The densities of mulberry scale in every generation and the plucking yield of the first, second, and autumn tea crop from 2010 to 2011 were investigated. The pest densities in the field with pyriproxyfen application decreased after the first generation in 2010. The pest densities in the third and subsequent generation in the field with pyriproxyfen application were significantly lower than those with DMTP and control treatments. Although the yield of the first tea crop in 2010 in the field with pyriproxyfen application was similar to that with other treatments, the yield of first and second tea crop in 2011 was significantly higher than that with other treatments. These results suggest that sufficient suppression of the pest for some generations through pyriproxyfen application improves the vigor of tea trees and results in higher yield.