Western flower thrips (WFTs), Frankliniella occidentalis Pergrande, and onion thrips (OTs), Thrips tabaci Lindeman, are two cosmopolitan insect pests of agricultural and horticultural plants. Understanding the occurrence and development of thrips on plants is crucial for identifying suitable plants that can be used for developing a “push‐pull” strategy against thrips. In this study, the dynamics of WFTs and OTs on plants (Allium fistulosum L., Medicago sativa L., Luffa cylindrica (L.) Roem., Ocimum basilicum L., and Schizonepeta tenuifolia (Benth.) Briq.) were investigated for two consecutive years (2018–2019). Throughout the survey, the abundances of both thrips species were strongly associated with plant species and plant phenology; both thrips species were present at relatively high densities on M. sativa but very low densities on O. basilicum and S. tenuifolia. Populations of both thrips species greatly increased during plant flowering. A Y‐tube olfactory test was used to study the effects of plant volatiles in mediating thrips behaviour and showed that volatiles of M. sativa were attractive to both thrips species whether emitted by the plant in the vegetative or flowering stage, while volatiles of O. basilicum and S. tenuifolia were repellent to thrips. Additionally, because of the presence of a high number of floral chemicals, both thrips species exhibited a greater preference for volatiles emitted by plants in the flowering period over those emitted by plants in the vegetative period. Our observations indicate that plant species and flowering status play an important role in the abundance dynamics of thrips and that the volatiles of flowering plants attract thrips more strongly than volatiles emitted by vegetative plants. These findings can facilitate the screening of attractive/unattractive plants for developing push‐pull strategies to control thrips.

中文翻译：

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营养和开花期植物上蓟马的丰度与植物挥发物有关

西方花蓟马（WFTs），富兰克氏菌Pergrande和洋葱蓟马（OTs）烟蓟马Lindeman是农业和园艺植物的两种世界性害虫。了解植物上蓟马的发生和发展对于确定可用于开发对抗蓟马的“推挽”策略的植物至关重要。在这项研究中，WFT和OTs在植物上的动态（葱属，紫花苜蓿，丝瓜（Luffa cylindrica（L.）Roem。，罗勒叶Ocimum L.和Schizonepeta tenuifolia（Benth。Briq。）连续两年（2018-2019）被调查。在整个调查中，两种蓟马的丰度都与植物种类和植物物候密切相关。两种蓟马的密度在紫花苜蓿上都相对高，但在O. basilicum和S. tenuifolia上密度却很低。在植物开花期间，这两种蓟马的种群大大增加。AY-管嗅觉测试用于研究植物挥发物在介导蓟马行为中的作用，结果表明，无论植物是在营养阶段还是在开花阶段，紫花苜蓿的挥发物都对这两个蓟马物种都具有吸引力，而紫苏挥发分和S. tenuifolia排斥蓟马。另外，由于存在大量的花卉化学物质，这两种蓟马种类都比开花期植物排放的挥发性物质更偏爱开花期植物排放的挥发性物质。我们的观察表明，植物种类和开花状态在蓟马的丰度动态中起重要作用，并且开花植物的挥发物比营养植物释放的挥发物更能吸引蓟马。这些发现可以帮助筛选具有吸引力/不吸引人的植物，以制定推挽策略来控制蓟马。