Gulf Coast Research and Education Center, University of Florida, Wimauma, FL.
U.S. Horticultural Research Laboratory, USDA, ARS, Fort Pierce, FL.
J Econ Entomol. 2021 Apr 13;114(2):914-921. doi: 10.1093/jee/toab016.
The whitefly, Bemisia tabaci MEAM1 Gennadius causes serious losses to Florida vegetable and ornamental production. In 2019, a maximum dose bioassay was administered to 20 field populations of B. tabaci MEAM1 collected from various economic and weed hosts across south Florida to assess insecticide efficacy. The maximum dose bioassay tests the top labeled rate of the insecticide against B. tabaci adults on treated cotton leaves in a Petri dish over a 72-h period. A susceptible laboratory colony of B. tabaci MEAM1 and a colony of B. tabaci MED were also tested. Survival over 72 h was used to produce an area under the maximum dose curve, which was used to compare insecticide effects on different populations. Overall, imidacloprid demonstrated the poorest efficacy, dinotefuran and flupyradifurone were the most effective, and bifenthrin, cyantraniliprole, and thiamethoxam tended to group together, providing intermediate control. Across populations tested, survival in whitefly adults treated with dinotefuran was 50% lower than whiteflies treated with imidacloprid, about 33% lower than whiteflies treated with thiamethoxam, bifenthrin, and cyantraniliprole, and 10% lower than whiteflies treated with flupyradifurone. Efficacy of bifenthrin was less than imidacloprid on some populations, particularly from the Homestead area. Imidacloprid and thiamethoxam had no effect on mortality of the MED population when it was tested after 22 mo in culture without exposure to insecticides, although 7 mo later, these materials resulted in some mortality for the MED population.
烟粉虱，Bemisia tabaci MEAM1 Gennadius，对佛罗里达州的蔬菜和观赏植物生产造成严重损失。2019 年，对从南佛罗里达州各种经济作物和杂草宿主中收集的 20 个烟粉虱 MEAM1 田间种群进行了最大剂量生物测定，以评估杀虫剂的功效。最大剂量生物测定测试了在处理过的棉花叶片上用杀虫剂处理烟粉虱成虫的最高标签剂量，在 72 小时的时间内用培养皿进行测试。还测试了敏感的烟粉虱 MEAM1 实验室种群和烟粉虱 MED 种群。72 小时后的存活率用于生成最大剂量曲线下的面积，用于比较不同种群中杀虫剂的效果。总体而言，吡虫啉的效果最差，啶虫脒和氟啶虫胺腈效果最显著，而呋虫胺、氯虫苯甲酰胺和噻虫嗪则倾向于聚集在一起，提供中等控制效果。在所测试的种群中，用啶虫脒处理的烟粉虱成虫的存活率比用吡虫啉处理的烟粉虱低 50%，比用噻虫嗪、呋虫胺和氯虫苯甲酰胺处理的烟粉虱低约 33%，比用氟啶虫胺腈处理的烟粉虱低 10%。在一些种群中，高效氯氟氰菊酯的效果不如吡虫啉，尤其是来自霍姆斯特德地区的种群。当在没有接触杀虫剂的情况下经过 22 个月的培养后测试 MED 种群时，吡虫啉和噻虫嗪对其死亡率没有影响，尽管 7 个月后，这些物质对 MED 种群造成了一些死亡率。
