【摘要】 中华圆盾蚧在上海地区一年发生三代,以受精雌成虫越冬。各代若虫孵化期分别在4月下旬至5月下旬;7月上旬至8月上旬;9月上旬至10月上旬。卵的发育起点温度为11.15±0.51℃;有效积温为58.11±5.4日度。经4种农药酌防治试验,均有较好的效果,其中40%氧化乐果1500倍,25%菊乐合剂2000倍在若虫孵化盛、末期两次喷洒,杀虫效果都高达90%以上。更多还原

【Abstract】 chinensis has three generations a year in Shanghai and overwinters as fertizered female.The durations of the scale crawler of three- generations are from late April to late May,early July to early August,early September to early October,respectively.The threshold temperature for develop- ment of eggs is 11.15±0.51℃.The effective thermal sum is 58.11±5.4 degree- days.Four pestcides were tested and all have good control,two of which,40% Omethoate 1500x and 25% Fenvalerate-dimethoate 2000x,spraying two times at peak and late of the scale crawlers have the control effectiveness up to 90% or more.更多还原