【摘要】 为掌握西宁市白蜡绵粉蚧的发生规律,筛选有效防治药剂,对白蜡绵粉蚧进行了生物学特性观察和药效试验,结果表明,白蜡绵粉蚧在西宁市1年发生1代,2个龄期,以2龄若虫在树皮裂缝、翘皮下、芽鳞间、树杈、侧枝背阴面结茧越冬.用40%氧化乐果500～1000倍液和2.5%天王星500～2000倍液防治白蜡绵粉蚧,防效可达93%以上.更多还原

【Abstract】 Phenacoccus fraxinus Tang. occurs just one generation and have two instars in a year in Xining City. It’s over winter by two ages cocoonnymphs under the raise bark, or within crevicebark, or inside scale and bud, and in the shady place of crotches and branches of the tree (Fraxinus chinensis Roxb.)had controlled by spraying with some insecticides Phenacoccus fraxinus is controlled, the result shows that 40% omethoate is diluted from 500 to 1 000 times, and or 2.5% Tianwangxing is diluted from 500 to 2 000 times which could control Phenacoccus fraxinus, whose effect of control may reach a rate of over 93%.更多还原