Control failure likelihood and spatial dependence of insecticide resistance in the tomato pinworm, Tuta absoluta |
| |
Authors: | Silva Gerson A Picanço Marcelo C Bacci Leandro Crespo André Luiz B Rosado Jander F Guedes Raul Narciso C |
| |
Institution: | 1. Departamento de Biologia Animal, Universidade Federal de Vi?osa, Vi?osa, MG, Brazil;2. Departamento de Engenharia Agron?mica, Universidade Federal de Sergipe, Aracaju, SE, Brazil |
| |
Abstract: | BACKGROUND: Insecticide resistance is a likely cause of field control failures of Tuta absoluta, but the subject has been little studied. Therefore, resistance to ten insecticides was surveyed in seven representative field populations of this species. The likelihood of control failures was assessed, as well as weather influence and the spatial dependence of insecticide resistance. RESULTS: No resistance or only low resistance levels were observed for pyrethroids (bifenthrin and permethrin), abamectin, spinosad, Bacillus thuringiensis and the mixture deltamethrin + triazophos (<12.5‐fold). In contrast, indoxacarb exhibited moderate levels of resistance (up to 27.5‐fold), and chitin synthesis inhibitors exhibited moderate to high levels of resistance (up to 222.3‐fold). Evidence of control failures was obtained for bifenthrin, permethrin, diflubenzuron, teflubenzuron, triflumuron and B. thuringiensis. Weather conditions favour resistance to some insecticides, and spatial dependence was observed only for bifenthrin and permethrin. CONCLUSION: Insecticide resistance in field populations of the tomato pinworm prevails for the insecticides nowadays most frequently used against them—the chitin synthesis inhibitors (diflubenzuron, triflumuron and teflubenzuron). Local selection favoured by weather conditions and dispersal seem important for pyrethroid resistance evolution among Brazilian populations of T. absoluta and should be considered in designing pest management programmes. Copyright © 2011 Society of Chemical Industry |
| |
Keywords: | insect growth regulators insecticide resistance distribution vegetable crops Brazil pest control |
本文献已被 PubMed 等数据库收录! |
|