Abstract
Populations of Bemisa tabaci MEAM1 were established from nineteen locations in south Florida, primarily from commercial tomato fields, and were tested using a cotton leaf petiole systemic uptake method for susceptibility to the nicotinic acetylcholine agonist insecticides imidacloprid, thiamethoxam, dinotefuran and flupyradifurone. Eleven populations produced LC50s for one or more chemicals that were not significantly different from the susceptible laboratory colony based on overlapping fiducial limits, indicating some degree of susceptibility. LC50s more than a 100-fold the laboratory colony were measured in at least one population for each material tested, indicating tolerance. LC50s (ppm) from field populations ranged from 0.901–24.952 for imidacloprid, 0.965–24.430 for thiamethoxam, 0.043–3.350 for dinotefuran and 0.011–1.471 for flupyradifurone. Based on overlapping fiducial limits, there were no significant differences in relative mean potency estimates for flupyradifurone and dinotefuran in relation to imidacloprid and thiamethoxam.
Highlights
The sweetpotato whitefly, Bemisia tabaci (Gennadius) Middle East Asia Minor 1 (MEAM1)(Hemiptera: Aleyrodidae), formerly known as B. tabaci biotype B, is a globally important pest of agronomic, horticultural and ornamental crops [1]
Studies were completed at the University of Florida Gulf Coast Research and Education Center (GCREC), Balm, FL (27◦ 45.5990 N, 82◦ 13.4460 W) between October 2013 and February 2015 to evaluate the susceptibility of field populations of B. tabaci MEAM1 to imidacloprid, thiamethoxam, dinotefuran and flupyradifurone
Indian River County was largely susceptible to the insecticides tested while the population reared susceptible to the insecticides tested while the population reared from E. fosbergii from Hillsborough from E. fosbergii from Hillsborough County was mostly tolerant: the LC50s for imidacloprid, County was mostly tolerant: the LC s for imidacloprid, dinotefuran and flupyradifurone produced dinotefuran and flupyradifurone 50 produced by the IndianRiver-Emilia population were not by the IndianRiver-Emilia population were not significantly different from the laboratory colony based significantly different from the laboratory colony based on overlapping fiducial limits; the LC50s on overlapping fiducial limits; the LC50 s produced by the Hillsborough-Emilia population were from produced by the Hillsborough-Emilia population were from 15 to 41-fold
Summary
The sweetpotato whitefly, Bemisia tabaci (Gennadius) Middle East Asia Minor 1 (MEAM1)(Hemiptera: Aleyrodidae), formerly known as B. tabaci biotype B, is a globally important pest of agronomic, horticultural and ornamental crops [1]. The whitefly causes significant crop losses globally by transmitting >150 species of viruses, and by inducing plant disorders such as silverleafing of squash and irregular ripening of tomato [2]. Bemisia tabaci is the primary pest of tomato (Solanum lycopersicum L.) in Florida [3]. It transmits Tomato yellow leaf curl virus (TYLCV), a geminivirus that can cause complete loss of crops [4]. Bemisa tabaci and TYLCV are managed in Florida tomato with a combination of clean culture (destruction of harvested tomato fields as the primary sources of inoculum), deployment of virus tolerant tomato varieties, use of metalized plastic mulches to repel the vector, and intensive insecticide use [8]
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