噻虫嗪灌根和捕食螨释放对设施西瓜刺吸类害虫的种群抑制作用

Suppressing Effects for Piercing Pests on Protected Watermelon by Thiamethoxam Drenching and Predatory Mites

蚜虫、粉虱、蓟马和叶螨等是设施蔬菜和瓜类作物生产中的常发性刺吸类害虫,同期同域发生为害,蚜虫、粉虱和蓟马的化学防控常依赖于烟碱类杀虫剂,但此类杀虫剂不能防控叶螨种群。本试验在设施西瓜栽培中,用烟碱类杀虫剂噻虫嗪进行苗期灌根后,在西瓜生长期内释放智利小植绥螨2次,可显著压低上述刺吸类害虫的田间种群数量,防治效果达78.10%~97.42%,实现协同控制效果。

Aphids,whiteflies,thrips and spider mites,etc.are common piercing pests for vegetables and melons in protected cultivation.These pests occur in the same region during the same period.The chemical control for aphids,whiteflies and thrips often relies on the neonicotinoid pesticides.However,such kind of insecticides are unable to control the spider mite population.In order to solve this problem,this experiment used neonicotinoid pesticide thiamethoxam to irrigate the roots at the seedling stage,and released for 2 times the natural enemy Phytoseiulus persimilis(Acari:Phytoseiidae)during the growth period of watermelon.Taking these measures,the field population of above piercing pests could be significantly reduced,and the control efficacy was 78.10%-97.42%,achieving the cooperative control effect.