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稻田主导杀虫剂对稻纵卷叶螟的杀卵作用
Ovicidal effect of primary insecticides on Cnaphalocrocis medinalis in paddy field
郭嘉雯;何晓婵;成义沙;AUNG Thura;鲁艳辉;李文强;徐红星;黄建雷;吴 俨;吕仲贤
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DOI:10.7679/j.issn.2095-1353.2022.114
作者单位:农产品质量安全危害因子与风险防控省部共建国家重点实验室,浙江省农业科学院植物保护与微生物研究所, 杭州 310021;金华市农业科学研究院,金华 321000
中文关键词:稻纵卷叶螟;卵发育;杀虫剂;毒力;浸卵法
英文关键词:Cnaphalocrocis medinalis; egg development; insecticides; toxicity; egg dipping method
中文摘要:
目的】 明确稻田主导杀虫剂对稻纵卷叶螟Cnaphalocrocis medinalis的杀卵作用,为科学安全高效防控稻纵卷叶螟提供理论依据。【方法】 选用稻田主导的8种杀虫剂(氯虫苯甲酰胺、阿维菌素、毒死蜱、茚虫威、吡虫啉、吡蚜酮、噻虫嗪和噻嗪酮),比较不同杀虫剂对不同日龄卵的毒杀效果及其对初孵幼虫存活和卵后续发育的影响。【结果】 选择产后1-4日卵进行处理发现,氯虫苯甲酰胺对卵的校正孵化抑制率在10.42%-100.00%之间,杀卵活性最强。其中,氯虫苯甲酰胺处理1日龄和3日龄卵时毒力较大(LC50为2.123和1.904 mg/L),处理1日龄卵可导致卵无法正常发育成胚胎,说明其在稻纵卷叶螟卵初产时防治更佳。吡虫啉对卵的校正孵化抑制率在20.00%-91.67%之间,杀卵作用最强。3-4日龄卵经吡虫啉处理后卵孵化受抑制,此时期处理卵对稻纵卷叶螟的杀卵效果最好,初孵幼虫的致死率更高,说明其可在产卵2日后防治。【结论】 8种杀虫剂中氯虫苯甲酰胺对稻纵卷叶螟杀卵活性最强,其在卵初产时处理杀卵效果最高,吡虫啉和噻虫嗪对稻纵卷叶螟也具有一定杀卵作用,其中吡虫啉的杀卵作用更强,其更适宜处理产后3-4日龄卵。
英文摘要:
[Objectives]  To clarify the ovicidal effect of primary insecticides on the rice leaf folder, Cnaphalocrocis medinalis, in paddy fields and thereby provide a scientific basis for the safe and efficient control of this pest. [Methods]  The toxicity of eight primary insecticides (chlorantraniliprole, abamectin, chlorpyrifos, indoxacarb, imidacloprid, pymetrozine, thiamethoxam and thiazide) commonly used in rice fields was determined in a laboratory. The toxicity of these insecticides on C. medinalis eggs of different ages, and their effects on the survival of newly hatched larvae, were measured, and the effect of insecticides on the subsequent development of eggs was observed. [Results]  Chlorantraniliprole had a corrected egg hatching inhibition rate of 10.42%-100.00%, and had stronger ovicidal activity than abamectin, chlorpyrifos or indoxacarb. Chlorantraniliprole was most toxic to 1 and 3-day-old (LC50 2.123 and 1.904 mg/L, respectively). Treatment soon after eggs are laid can cause them to fail to develop normally and the age at which eggs were treated significantly affected the mortality of newly hatched larvae, indicating that it is better to treat eggs as soon as possible. The corrected hatching inhibition rate for imidacloprid ranged from 20.00% and 91.67%. Imidacloprid had stronger ovicidal effect than pymetrozine and thiamethoxam. Thiazide had the least ovicidal effect. Treating 3 to 4-day-old eggs with imidacloprid resulted in larvae developing normally but inhibited hatching. Treating eggs at this time achieved both the best ovicidal effect and the highest mortality among newly hatched larvae, indicating that imidacloprid should be applied 2 days after eggs have been laid. [Conclusion]  Of the eight insecticides, chlorantraniliprole had the strongest ovicidal activity to the rice leaf folder, and its ovicidal effect was higher when applied to newly laid eggs. Imidacloprid and thiamethoxam had a lower ovicidal effect, but, of these imidacloprid had the stronger effect and can achieve good results when applied to eggs 3 to 4 days after laying.
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