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Natural Enemy Community Composition and Impact on Brown Marmorated Stink Bug (Hemiptera: Pentatomidae) Eggs in Minnesota Apple Orchards
Environmental Entomology ( IF 1.7 ) Pub Date : 2020-01-23 , DOI: 10.1093/ee/nvz165
Hailey N Shanovich 1 , Brian H Aukema 1 , Robert L Koch 1
Affiliation  

Abstract Halyomorpha halys is an invasive, polyphagous insect that feeds on many major crops, including apple. Statewide monitoring in Minnesota has shown continued increase of H. halys populations and occurrence of this pest in apple orchards. Potential arthropod natural enemies of H. halys and other pests have not been studied in Minnesota apple orchards. The purpose of this study was to characterize the composition of natural enemy communities; compare their abundances, richness and diversities between apple cultivars using different sampling methods; and assess the impact of natural enemies on sentinel eggs of H. halys in Minnesota apple orchards. Sampling occurred during the summers of 2017 and 2018 on Zestar! and Honeycrisp cultivars in four different apple orchards. In vacuum samples, arachnids, neuropterans, and coccinellids had the highest relative abundances. On yellow sticky traps, anthocorids were the most abundant. The total predator abundance differed between the cultivars sampled across years, with more predators found on Zestar! compared with Honeycrisp. No differences were observed in richness or diversity between cultivars with the exception of yellow sticky traps in 2017, which showed a greater diversity of predators in Zestar!. Despite the abundance of natural enemies sampled, sentinel egg masses deployed in the orchards each summer suffered on average <2% predation and no parasitism across years. Knowledge of differences in predator abundance between cultivars could inform management decisions; however, with current management practices, the potential for biological control of H. halys in conventional apple orchards appears low.

中文翻译:

明尼苏达州苹果园的天然敌群组成及其对褐鹳臭虫(半翅目:五足科)卵的影响

摘要 Halyomorpha halys 是一种侵入性多食性昆虫,以包括苹果在内的许多主要作物为食。在明尼苏达州进行的全州监测显示,H. halys 种群数量持续增加,并且这种害虫在苹果园中发生。尚未在明尼苏达州苹果园研究 H. halys 和其他害虫的潜在节肢动物天敌。本研究的目的是表征天敌群落的组成;使用不同的采样方法比较苹果品种之间的丰度、丰富度和多样性;并评估天敌对明尼苏达州苹果园 H. halys 哨兵卵的影响。采样发生在 2017 年和 2018 年夏天在 Zestar 上!和蜜脆品种在四个不同的苹果园中。在真空样品中,蛛形纲动物、神经翅目动物、和瓢虫的相对丰度最高。在黄色粘性诱捕器上,花蝽最为丰富。不同年份采样的品种之间的总捕食者丰度不同,在 Zestar 上发现了更多的捕食者!与蜜脆相比。除了 2017 年的黄色粘性陷阱外,没有观察到品种之间的丰富度或多样性差异,这表明 Zestar! 中捕食者的多样性更大。尽管采样了大量的天敌,但每年夏天部署在果园中的哨兵卵群平均遭受 <2% 的捕食,并且多年来没有寄生。了解不同品种之间捕食者丰度的差异可以为管理决策提供信息;然而,根据目前的管理实践,在传统苹果园中生物控制 H. halys 的潜力似乎很低。
更新日期:2020-01-23
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