混合虫媒线虫与化学农药防治棉铃虫的联合作用

R. El-Ashry, Mohamed Ali, Abdelhadi A I Ali
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引用次数: 1

摘要

化学农药的特点是减少有害生物种群的影响作用迅速,而微生物农药需要沿潜伏期才能引起有限的减少有害生物种群。杀菌剂的效率低可能是由于与农用化学品相容性低或杀菌剂施用不当造成的,因此,本研究对5种常见化学杀虫剂和杀线虫剂与5种相容的虫病线虫(epn)混合使用的可能性进行了评价。为防治番茄果螟(helicoverpanmigera),生物测定结果显示,按推荐剂量施用毒死蜱(Pestban 48% EC)、毒死蜱(Tafaban 48% EC)和氟虫胺(Takumi 20% WG)。氟苯双胺对感染epn的幼鱼的毒性较氟苯双胺低(Dento 40% EC)。暴露7 d后,拟虫对农药的敏感性分别为49.45%和43.76%,高于异虫。化学农药与EPNs的IJs对番茄果虫5龄幼虫的联合防治表现为加性或拮抗作用,无增效作用。除氟苯双胺与feltiae和H. bacteriophora (Ba-1)联用外,还记录了所有非那米磷联用、阿维菌素与feltiae和H. bacteriophora (Ba-1)联用的拮抗反应。氟苯双胺与glaseri s.s、carpocapsae s.s和bacteriophora (hp88)联用有加性效应。在温室试验中,单独施用EPNs对5龄幼虫的死亡率为28% ~ 36%。其中,与氟虫磷(64.0%)、毒死蜱(54%)和阿维菌素(54.0%)配用的噬菌体(HP88)幼虫死亡率最高,与当地分离菌株Ba-1的幼虫死亡率在40% ~ 50%之间。综上所述,这些线虫与化学农药在作物保护中综合利用是可行的。
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The Joint Action of Entomopathogenic Nematodes Mixtures and Chemical Pesticides on Controlling Helicoverpa armigera (Hübner)
Chemical pesticides are characterized by the rapid impact effect in reducing pest population, while, microbial pesticides need along the latent period to cause a limited reduction of the pest population. Low efficiency of biocides may be due to low compatibility with agrochemicals or poor application of biocide, so, the study carried out to evaluate the possibility of mixing five common chemical insecticides and nematicides with five compatible entomopathogenic nematodes (EPNs). For the control of tomato fruit borer (Helicoverpaarmigera),bioassay revealed that pesticide chlorpyrifos (Pestban 48% EC), chlorpyrifos (Tafaban 48% EC) and flubendiamide (Takumi 20% WG) were applied at the recommended dose.  Flubendiamide was less toxic to EPNs infective juveniles compared to fenamiphos (Dento 40% EC). Moreover, steinernematid species were more sensitive than heterorhabditid species to pesticides recording 49.45% and 43.76%, respectively, after 7 days of exposure. The joint action of tested chemical pesticides with IJs of EPNs in controlling the 5th instar larvae of tomato fruit wormshowed an additive or antagonistic reaction with no evidence of synergistic action. Antagonism reaction was recorded with all fenamiphos combinations;the combination ofabamectin and S. feltiae as well as H. bacteriophora (Ba-1), in addition to, flubendiamide combinations with S. feltiae and H. bacteriophora (Ba-1). While, an additive effect was observed in flubendiamide combinations with S. glaseri, S. carpocapsae and H. bacteriophora (HP 88). In the greenhouse experiment, the application of EPNs alone caused mortality ranged from 28 to 36% for 5th instar larvae. Whereas, the highest larval mortality was observed in descending order for combinations between H. bacteriophora (HP88 strain) with fenamiphos (64.0%), chlorpyrifos (54%) and abamectin (54.0%), while, local isolate, H. bacteriophora (Ba-1 strain) achieved mortality ranged from 40 to 50 % with the tested pesticides. Overall, results indicate the feasibility of the integrated use of these nematode species and chemical pesticides in crop protection.
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