关键词: 鸭脚树星室木虱, 室内毒力, 林间药效, 防治效果

Abstract: Alstonia scholaris was one of the greening tree species in the southern cities, which was seriously damaged by a gall-inducing psylloid Pseudophacopteron alstonium. To take P. alstonimu on A. scholaris in Guangzhou as an object, the characteristics of the occurrence and damage were investigated, and the indoor toxicity tests and field trials were carried out with 4 kinds of low-toxic and high-efficiency pesticides including 0.5% azadirachtin, avermectin·acetamiprid, 3% acetamiprid and 20% imidacloprid. The results showed that the gall-inducing psylloid P. alstonium had been outbroken in Guangzhou. The insecticidal effect of 0.5% azadirachtin, avermectin·acetamiprid and 3% acetamiprid on the nymphae of P. alstonium were better than that of 20% imidacloprid in the laboratory. The efficacy of the azadirachtin, acetamiprid and avermectin·acetamiprid were also better in restraining the eclosion of P. alstonium in the field. The nymphae mortality rate of P. alstonium was above 63% after using azadirachtin (10 mg·L-1), avermectin·acetamiprid (200 mg·L-1), acetamiprid (30 mg·L-1) for 20 d in the field. Considering the situation of integrated pest management and environment protection, azadirachtin was recommended to use for the nymphae of P. alstonium.

Key words: Pseudophacopteron alstonium, indoor toxicity, field efficacy, prevention and cure effect