Differences in development and reproduction of the mulberry scale, Pseudaulacaspis pentagona Targioni (Hemiptera : Diaspididae), on resistant and susceptible varieties of tea plant. [Japanese]

摘要

Differences in development and reproductive ability of the mulberry scale, Pseudaulacaspis pentagona Targioni, were investigated using resistant and susceptible tea varieties. The developmental period of the second larval instar, the pupal stage, and the period from egg hatching to emergence in males was longer on the resistant varieties than on the susceptible ones. The second instar preoviposition period and period from egg hatching to the beginning of egg-laying in females were also retarded on the resistant varieties. Only 18.5% and 23.8% of neonate female larvae reached the adult stage on the resistant varieties, Hatsumomiji and Sayamakaori, respectively. In contrast, 42.4% and 59.5% of larvae developed to adults on the susceptible varieties, Yutakamidori and Takachiho, respectively. The number of laid eggs and ovarian eggs in females reared on the resistant varieties, Sayamakaori and Hatsumomiji, were reduced to 5.4% and 11.3%, respectively, of the susceptible variety, Takachiho.