Gulf Coast Research and Education Center, University of Florida, Wimauma, FL.
Department of Entomology and Nematology, University of Florida, Gainesville, FL.
Environ Entomol. 2021 Feb 17;50(1):12-18. doi: 10.1093/ee/nvaa149.
Scirtothrips dorsalis Hood infest strawberry (Fragaria x ananassa Duchesne, Rosaceae) fields from nearby crop fields and surrounding vegetation and cause injury to plants by feeding on young leaf tissues. Greenhouse and field studies were conducted to determine the short-range movement of S. dorsalis to assess the risk of an early S. dorsalis population to spread to adjacent plants. In a greenhouse, 25 potted strawberry plants were arranged in two concentric rows around a central plant, where plants in inner rows were 20 cm, and those in the outer rows were 40 cm from the central plant. In the field, 20 strawberry plants were arranged in two beds (90 cm apart), ten in each bed, and five plants in each row, with plants 30 cm apart. White sticky cards were placed at 60-120 cm from the central plant. Fifty S. dorsalis adults were released on a centrally located plant, and the numbers of S. dorsalis adults and larvae and feeding injury were recorded for 9-17 d on adjacent plants and sticky cards. Results showed that significantly more S. dorsalis adults and larvae remained on the initially infested plant compared to adjacent plants, although few adults were found up to 120 cm on sticky cards. The rate of spread of feeding injury was low with slight bronzing injury (<10% injury) on adjacent plants by 14-17 d. Since most S. dorsalis remained on initially infested plants for at least 2 wk, it is feasible to delay management actions and 'rescue' plants around a plant with minor injury symptoms.
蓟马科缨翅目昆虫（Scirtothrips dorsalis Hood）在草莓（Fragaria x ananassa Duchesne，蔷薇科）田内，通过取食嫩叶组织，危害植株，其虫源主要来自附近作物田及周边植被。本研究通过温室和大田试验，旨在明确该缨翅目昆虫的短距离扩散行为，评估早期种群扩散至临近植株的风险。温室试验中，25 株盆栽草莓呈内外两圈排列，中心一株草莓位于内圈，距离 20cm，外圈距离 40cm。大田试验中，20 株草莓呈两行排列，每行 10 株，株距 30cm。每株草莓旁均放置白色粘虫板，距离中心植株 60-120cm。在中心植株释放 50 头缨翅目成虫，记录 9-17d 内临近植株及粘虫板上成虫及幼虫数量和为害情况。结果表明，相较于临近植株，最初受侵染植株上的成虫和幼虫数量明显更多，尽管在距离中心植株 120cm 远的粘虫板上也有少量成虫。随着时间推移，为害症状逐渐扩散，14-17d 时临近植株出现轻微黄化（<10%为害）。由于大多数缨翅目昆虫会在最初受侵染植株上停留至少 2 周，因此可以延迟管理措施，对仅有轻微症状的植株进行“拯救”。
