摘要
通过室内生物测定、盆栽和田间试验,研究了新型杀虫剂吡蚜酮对水稻褐飞虱的作用方式、不同龄期毒力、田间使用技术及防治效果,并初步探讨了吡蚜酮对天敌黑肩绿盲蝽和蜘蛛(机敏漏斗蛛)的毒力及其田间数量的影响。结果表明:吡蚜酮对褐飞虱不仅具有触杀作用,还具有较强的内吸作用。吡蚜酮对褐飞虱1龄、3龄若虫的168hLC50值分别为14.99mg·L-1、13.08mg·L-1,显著低于5龄若虫和成虫。盆栽试验发现当盆钵中保持水层时,吡蚜酮的防治效果更高。在褐飞虱低龄期、田间保持水层条件下,应用25%吡蚜酮WP制剂300g·hm-2、450g·hm-2和600g·hm-2,药后15d的防治效果可达95%以上。进一步的研究发现,吡蚜酮对黑肩绿盲蝽成虫的安全性级别为较不安全(Ⅲ级),田间使用吡蚜酮后黑肩绿盲蝽数量减少;吡蚜酮对蜘蛛安全性级别为安全(Ⅰ级),田间使用吡蚜酮后蜘蛛数量无明显变化。研究结果为吡蚜酮的合理使用提供了科学依据。
Laboratory bioassay,pot and field experiments on the action mode,toxicity to instar,application technique and control effect of pymetrozine against brown planthopper （BPH） [Nilapabata lugens （Stl）] were conducted.The impact of pymetrozine on N.lugens natural enemies,Cyrtorhinus lividipennis （Reuter） and spider [Agelena difficilis （Fox）],was investigated.The results show that pymetrozine influences BPH through not only contact poisoning,but also a strong systemic action.LC50 values after 168 h of pymetozine application against the 1st and 3rd BPH nymphs are respectively 14.99 mg·L^-1 and 13.08 mg·L^-1,significantly lower than those against the 5th and adult nymphs.The results from the pot experiment indicate that control effects of pymetrozine are high when pots contain water layer.After 15 days,control effects exceed 95% in young BPH larva under 25% pymetrozine WP at 300 g·hm^-2,450 g·hm^-2 and 600 g·hm^-2 with sustained paddy water layer.Further studies show that pymetrozine is moderately toxic to C.lividipennis （Ⅲ class）,and C.lividipennis number decreases after pymetrozine application.Pymetrozine is safe to spiders （Ⅰ class）,with insignificant impact on spider population after spray.This study therefore lays the scientific basis for rational use of pymetrozine.
出处
《中国生态农业学报》
CAS
CSCD
北大核心
2010年第5期1054-1059,共6页
Chinese Journal of Eco-Agriculture
基金
"十一五"国家科技支撑计划项目(2006BAD08A03-4)
江苏省农业科技自主创新项目[CX(09)624]资助
关键词
褐飞虱
吡蚜酮
作用方式
使用技术
天敌
安全性评价
Nilapabata lugens （Stl）
Pymetrozine
Action mode
Application technique
Natural enemy
Safety evaluation
