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J Econ Entomol

Title:		Evaluation of Resistance Management for the Oriental Fruit Moth (Lepidoptera: Tortricidae) to Insecticides in Brazilian Apple Orchards
Author(s):		Monteiro LB; Witt LG; Guiloski IC; Dos Santos RSS; Silva de Assis HC;
Address:		"Department of Crop Protection, Federal University of Parana, 80035-050, Curitiba, Parana State, Brazil. Department of Pharmacology, Federal University of Parana, Curitiba-PR, Brazil. EMBRAPA Uva e Vinho, EEFT, Vacaria, RS, Brazil"
Journal Title:		J Econ Entomol
Year:		2020
Volume:		113
Issue:		3
Page Number:		1411 - 1418
DOI:		10.1093/jee/toaa023
ISSN/ISBN:		1938-291X (Electronic) 0022-0493 (Linking)
Abstract:		"The oriental fruit moth, Grapholita molesta (Busk, 1916), is one of the most important pests in apple orchards in southern Brazil. Chemical control is still the most commonly used strategy for pest control. The aim of this study was to determine the resistance evolution of seven South Brazilian populations to four insecticides (chlorantraniliprole, lufenuron, chlorpyrifos, and fenitrothion). Bioassays were paired with metabolic analyses of glutathione-S-transferase (GST), carboxylesterases (alpha-NA and beta-NA), and acetylcholinesterase (AChE) to understand the possible role with phytosanitary strategies in the insects' susceptibility. Insect populations were collected in the municipalities of Campo do Tenente, Lapa and Porto Amazonas, Fraiburgo, Sao Joaquim, and Vacaria and multiplied in the laboratory. Two susceptible and two resistant populations were used as references. The bioassays showed that five populations were considered more resistant to organophosphates, six to lufenuron and two to chlorantraniliprole when compared with the sensitive population. None of the field populations had greater resistance than the resistant laboratory population. The enzymatic activity of AChE and GST was elevated in most of the populations that were less susceptible to organophosphates and lufenuron. The populations originating from orchards that used sexual confusion techniques had the greatest susceptibility based on toxicological and biochemical bioassays. Populations under pressure from various compounds had high GST, alpha and beta-NA activity. There is evidence that a diversity of control strategies can provide better resistance management"
Keywords:		Animals Brazil Fruit *Insecticides *Malus *Moths Grapholita molesta apple tree insecticide management of pest resistance mating disruption;
Notes:		"MedlineMonteiro, Lino Bittencourt Witt, Luis Gustavo Guiloski, Izonete Cristina Dos Santos, Regis Silvori Silva Silva de Assis, Helena C eng Research Support, Non-U.S. Gov't England 2020/02/28 J Econ Entomol. 2020 Jun 6; 113(3):1411-1418. doi: 10.1093/jee/toaa023"