罗汉松新叶蚜危害的初步观察及防治

The Preliminary Observation and Control of Neophyllaphis podicalpi

初步调查了罗汉松新叶蚜(Neophyllaphis podicalpi Takahashi)危害,测试了几种杀虫剂对其室内毒力和田间药效。结果表明,罗汉松新叶蚜在广东全年发生,主要为害罗汉松幼嫩部位,严重时引发媒烟病;室内毒力结果表明,鱼藤酮、噻虫嗪、烯啶虫胺和高效氟氯氰菊酯对罗汉松新叶蚜有较好活性,处理后48 h的致死中浓度LC50分别为7.53、6.59、8.43和8.26 mg/L;田间药效试验表明,2.5%鱼藤酮乳油、0.6%苦参碱水剂、50%吡蚜酮水分散粒剂和25 g/L高效氟氯氰菊酯(功夫)乳油均有较好的防效,处理后15 d的防治效果在90%以上。

Preliminary observation on the damage of Neophyllaphis podicalpi, to docarpus, and toxicity of 8 common insecticides to T. urticae and control efficiency of 4 insecticides were also determined indoors and in the field. The resuhs showed that N. podicalpi, occurs in Guangdong throughout the year,did harm to the tender leaf and young shoot of docarpus, and led to soot and disease when serious occurrence. The results of the indoor bioassay showed that rotenone, thiamethoxam, nitenpyram and beta-cyfluthrin were significantly higher than that of other insecticides, treatment after 48 h, the LC50 were 7.53, 6.59, 8.43, 8.26 mg/L, respectively. The field control effects showed 2.5% rotenone EC, 0.6%matrine AS, 50% pymetrozine WG, 25 g/L beta-cyfluthrin EC achieved control efficiencies more than 90% after treatment 15 d.