The whitefly, Bemisia tabaci MEAM1 (Gennadius) (Hemiptera: Aleyrodidae) is a major pest of vegetable crops in the USA, causing yield losses through transmission of plant viruses and induction of plant disorders. Irregular ripening of tomato and silvering of squash leaves are whitefly-induced plant disorders associated with B. tabaci nymphal feeding. Insecticides applied to manage B. tabaci nymphs and these plant disorders include insect growth regulators (IGRs) and lipid biosynthesis inhibitors. Eleven B. tabaci MEAM1 field populations were collected from vegetables and weeds in south Florida in 2019–2020 to assess the efficacy of nymphal insecticides using a maximum dose bioassay. A susceptible laboratory colony of B. tabaci MEAM1 and a colony of B. tabaci MED were also tested. Among the field populations, spirotetramat was the least efficient product for reducing adult emergence and pyriproxyfen and buprofezin were both highly effective. In contrast to the field populations, the lab MED colony was highly susceptible to spirotetramat while pyriproxyfen and buprofezin demonstrated low efficacy for reducing adult emergence. The results indicate that tolerance to spirotetramat may be present in field populations of B. tabaci.

粉虱Bemisia tabaci MEAM1 (Gennadius)（半翅目：Aleyrodidae）是美国蔬菜作物的主要害虫，通过传播植物病毒和诱导植物病害造成产量损失。番茄不规则成熟和南瓜叶变银是粉虱引起的与粉虱若虫取食相关的植物疾病。用于控制烟粉虱若虫和这些植物疾病的杀虫剂包括昆虫生长调节剂 (IGR) 和脂质生物合成抑制剂。2019-2020 年，从佛罗里达州南部的蔬菜和杂草中收集了11 个烟粉虱MEAM1 田间种群，以使用最大剂量生物测定法评估若虫杀虫剂的功效。易感的实验室菌落烟粉虱MEAM1 和烟粉虱MED菌落也进行了测试。在田间种群中，螺虫乙酯是降低成虫羽化效率最低的产品，而吡丙醚和丁苯丙嗪都非常有效。与野外种群相比，实验室 MED 菌落对螺虫乙酯高度敏感，而吡丙醚和丁苯丙嗪在减少成虫出现方面表现出低效。结果表明烟粉虱的田间种群可能存在对螺虫乙酯的耐受性。