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首页> 外文期刊>Journal of Economic Entomology >Rise and fall of cotton aphid (Hemiptera : Aphididae) populations in southeastern cotton production systems
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Rise and fall of cotton aphid (Hemiptera : Aphididae) populations in southeastern cotton production systems

机译：东南棉花生产系统中棉蚜（半翅目：蚜科）种群的兴衰

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摘要

The impact of natural enemies on cotton aphid, Aphis gossypii Glover (Hemiptera: Aphididae), populations in cotton, Gossypium hirsutum L., production systems in the southeastern United States was evaluated over 3 yr in irrigated commercial cotton fields. Fungal epizootics caused by the entomopathogen Neozygites fresenii (Nowakowski) Batko reduced aphid numbers to subthreshold levels in 1999, 2000, and 2001 and occurred consistently in early to mid-July in all 3 yr. Scymnus spp. were the most abundant aphidophagous predators, although other coccinellid species and generalist predators such as spiders, fire ants, heteropterans, and neuropterans also were present. Studies using arthropod exclusion cages demonstrated little impact of predators or parasitoids on aphid populations before fungal epizootics. Arthropod natural enemies were most abundant after epizootics and may have suppressed aphid populations late in the season. Seed cotton yield, and lint quality were not affected by aphicide applications in any year of the study. Implications of these findings for aphid management in the southeastern United States are discussed.
机译：在美国东南部的灌溉商业棉田中，评估了天敌对棉蚜，棉蚜（半翅目：蚜虫），棉花种群，陆地棉，生产系统的影响，历时三年。昆虫病原体Neozygites fresenii（Nowakowski）Batko引起的真菌流行病使蚜虫数量在1999年，2000年和2001年降低到亚阈值水平，并且在所有3年的7月上中旬一直发生。鳞翅目是最富食虫性的捕食者，尽管也存在其他球虫物种和通体捕食者，例如蜘蛛，火蚁，异翅类和神经翅类。使用节肢动物排斥笼的研究表明，在真菌流行病发生之前，捕食者或寄生物对蚜虫种群的影响很小。节肢动物后，节肢动物的天敌最多，而且可能在本季节后期抑制了蚜虫种群。在该研究的任何一年中，施用杀虫剂都不会影响籽棉的产量和皮棉质量。讨论了这些发现对美国东南部蚜虫管理的意义。

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