Department of Entomology and MOA Key Laboratory of Pest Monitoring and Green Management, College of Plant Protection, China Agricultural University, Beijing, China.
Pest Manag Sci. 2022 Aug;78(8):3305-3313. doi: 10.1002/ps.6956. Epub 2022 May 14.
Harmonia axyridis Pallas (Coleoptera: Coccinellidae) is an important natural enemy of aphids. Plant species and plant health conditions can affect the behavior of H. axyridis. To determine plant effects on this lady beetle, we examined beetle responses to four cover crops: coriander (Coriadrum sativum L., Apiales: Apiaceae), marigold (Tagetes erecta L., Asterales: Asteraceae), sweet alyssum (Lobularia maritima L., Brassicales: Brassicaceae), and alfalfa (Medicago sativa L., Fabales: Fabaceae). Our goal was to better understand this predator's ovipositional behavior in response to different plants and its olfactory response to the aphid-induced volatiles from these plants.
We found that this lady beetle did not have any significant oviposition preference among the four plant species, but H. axyridis preferred to lay eggs on the lower surface of leaves, regardless of the plant species. H. axyridis females had a significant preference for aphid-infested marigolds, but were not attracted by any of the other three cover plants or marigolds without aphid damage. Compared to the uninfested marigold plants, the emission of 12 compounds significantly increased on the aphid-infested marigolds, and two of them were attractive to H. axyridis under suitable concentrations.
H. axyridis did not show any significant oviposition preference among the four cover crops. Aphid-infested marigolds can attract H. axyridis. Indole and terpinen-4-ol mediated lady beetle attraction. These synomones have potential for manipulating populations of H. axyridis as a component of conservation biological control. © 2022 Society of Chemical Industry.
异色瓢虫（鞘翅目：瓢虫科）是蚜虫的重要天敌。植物种类和植物健康状况会影响异色瓢虫的行为。为了确定植物对这种瓢虫的影响，我们研究了瓢虫对四种覆盖作物的反应：芫荽（芫荽，伞形科：伞形科）、万寿菊（万寿菊，菊科：菊科）、甜茴香（滨藜，十字花科：十字花科）和紫花苜蓿（紫花苜蓿，豆科：豆科）。我们的目标是更好地了解这种捕食者对不同植物的产卵行为及其对这些植物上蚜虫诱导挥发物的嗅觉反应。
我们发现，这种瓢虫在这四种植物中没有明显的产卵偏好，但无论植物种类如何，异色瓢虫都更喜欢在叶片的下表面产卵。异色瓢虫雌虫对受蚜虫侵害的万寿菊有明显的偏好，但对其他三种覆盖植物或没有蚜虫损害的万寿菊没有吸引力。与未受感染的万寿菊植物相比，受蚜虫侵害的万寿菊植物的 12 种化合物的排放显著增加，其中两种在合适的浓度下对异色瓢虫具有吸引力。
异色瓢虫在这四种覆盖作物中没有表现出任何明显的产卵偏好。受蚜虫侵害的万寿菊可以吸引异色瓢虫。吲哚和萜品-4-醇介导的瓢虫吸引力。这些信息素具有操纵异色瓢虫种群的潜力，可作为保护生物防治的一个组成部分。© 2022 化学工业协会。
