3种冬季封园处理对次年春茶期两种主要害虫发生的影响

Efficacies of Winter Treatments on Incidence of Two Major Pest Infestations in Spring on Tea Bushes

比较冬季喷施石硫合剂、白僵菌和土施白僵菌等3种封园处理对次年春茶期茶橙瘿螨Acaphylla theae、茶小绿叶蝉Empoasca onukii发生数量的影响。结果表明,3种封园处理对次年春茶期茶小绿叶蝉发生数量无显著影响。冬季喷施45%石硫合剂晶体120倍对茶橙瘿螨防效好,且持效期长,药后129d,处理区螨口减退率为100%,对照区螨口减退率为-2137.50%。

Alleviating Acaphylla theae and Empoasca onukii infestations on tea bushes by spraying lime-sulfur insecticide or Beauveria bassiana on the plants,or application of B.bassiana on the soil during winter dormant season at the plantation was studied.No significant effect was observed on the number of tea green leafhoppers(E.onukii)in the spring following the winter treatments.On the other hand,a lasting and effective control on A.theae was evident when the plants were sprayed with a 120x dilution of 45%lime-sulfur crystals.An 100%reduction on A.theae in the area after 129 days of the treatment was achieved.In contrast,the pest count increased 2,138%in the control plot.