白蜡绵粉蚧生物学特性

Bionomics of Phenacoccus fraxinus

白蜡绵粉蚧 Phenacoccus fraxinus主要为害白蜡树 F raxinus sp.,在西宁市 1年 1代 ,以 2龄若虫越冬。化学防治适期为 3月下旬至 4月上旬雌虫成虫期 ,用 4 0 %氧化乐果或天王星 2 0 0 0倍液均匀喷洒 ,杀虫效果 93%以上 。

Phenacoccus fraxinus mainly attacks Fraxinus sp . It has one generation a year and overwinters as nymph in Xining of Qinghai Province.The control result showed that the mortality of the insect was over 93% and the damage and dispersal of the insect were checked when 40% Omethoate(diluted into 800 times) was sprayed from last decade of March to first 10 days of April.