据湖南省桃源县植保站综合4年调查表明,幼蚧抗药力强,且第一代幼蚧发生较为整齐,须准确掌握第一代幼蚧盛发期。调查方法:每年从4月中、下旬开始,剪取带有越冬代虫态的枝条,置于盛水瓶中逐日观察,查到第一代幼蚧在叶上发生的初见日之后21 According to a comprehensive 4-year survey conducted by the plant protection station in Taoyuan County, Hunan Province, it shows that the juveniles are highly resistant and the first generation of juveniles are more neat and tidy. Method of investigation: Starting from the middle and late April each year, the branches with the overwintering pests were cut and placed in a water bottle for daily observation. The first day after the first generation of juvenile was found on the leaves