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首页> 美国卫生研究院文献>Insects >Development of a Microbial-Based Integrated Pest Management Program for Helicoverpa spp. (Lepidoptera: Noctuidae) and Beneficial Insects on Conventional Cotton Crops in Australia
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Development of a Microbial-Based Integrated Pest Management Program for Helicoverpa spp. (Lepidoptera: Noctuidae) and Beneficial Insects on Conventional Cotton Crops in Australia

机译：为Helicoverpa spp开发基于微生物的病虫害综合管理程序。 （鳞翅目：夜蛾科）和澳大利亚常规棉农作物上的有益昆虫

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摘要

Entomopathogenic fungi, when used as a microbial control agent against cotton pests, such as Helicoverpa spp., may have the potential to establish and spread in the environment and to have an impact on both pests and beneficial insects. Information on the effect of entomopathogenic fungi on pests and beneficial insects is crucial for a product to be registered as a biopesticide. The effect of the entomopathogenic fungus BC 639 (Aspergillus sp.) against Helicoverpa spp. and beneficial insects (mostly predatory insects) was studied in the laboratory and in cotton field trials. The results show that when Helicoverpa spp. second instar larvae were exposed to increasing concentrations (from 102 to 109) of the entomopathogenic fungus BC 639, the optimum dose required to kill over 50% of the insects was 1.0 × 107 spores/mL. In the field trials, the number of Helicoverpa spp. per metre on plots treated with 1.0 or 0.50 L/ha of BC 639 was the same as on plots treated with the recommended rate of the commercial insecticide, Indoxacarb. However, when plots were treated with 0.25 L/ha of BC 639, this was not as effective at controlling Helicoverpa spp. as 1.0 or 0.5 L/ha BC 639 or Indoxacarb. BC 639 had less effect on predatory insects when applied at lower rates (0.50 and 0.25 L/ha) than at higher rates (1.0 L/ha). Thus, BC 639 was more selective against predators when applied at lower rates than at the higher rate, but was also more selective than Indoxacarb. Thus, the ability of BC 639 to control Helicoverpa spp. effectively with a minimal effect on predatory insects indicates its potential for enhancing integrated pest management programs and to sustain cotton production.
机译：昆虫病原真菌用作棉铃虫（Helicoverpa spp。）等棉花害虫的微生物防治剂时，可能具有在环境中建立和传播的潜力，并且对害虫和有益昆虫都有影响。有关昆虫病原性真菌对害虫和有益昆虫的影响的信息对于将产品注册为生物农药至关重要。病原性真菌BC 639（曲霉属）对Helicoverpa spp的影响。在实验室和棉花田间试验中研究了有益昆虫（主要是掠食性昆虫）。结果表明，当Helicoverpa spp。将第二龄幼虫的浓度提高（从10 2 到10 9 ）暴露于致病性真菌BC 639，杀死50％以上昆虫所需的最佳剂量为1.0×10 7 孢子/ mL在田间试验中，Helicoverpa spp的数量。在用1.0或0.50 L / ha的BC 639处理的地块上，每米的平均米数与在以推荐剂量的商业杀虫剂茚虫威处理的地块上的每米相同。但是，当用0.25 L / ha的BC 639处理地块时，在控制Helicoverpa spp上效果不佳。浓度为1.0或0.5 L / ha BC 639或茚虫威。当以较低的比例（0.50和0.25 L / ha）施用时，BC 639对掠食性昆虫的影响要小于较高的比例（1.0 L / ha）。因此，BC 639以较低的施用量而不是较高的施用量对捕食者更具选择性，但也比茚虫威更具选择性。因此，BC 639控制Helicoverpa spp的能力。对捕食性昆虫产生最小影响的有效措施表明了其增强综合害虫管理计划和维持棉花生产的潜力。

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