Evaluation of Resistance Management for the Oriental Fruit Moth (Lepidoptera: Tortricidae) to Insecticides in Brazilian Apple Orchards

Evaluation of Resistance Management for the Oriental Fruit Moth (Lepidoptera: Tortricidae) to Insecticides in Brazilian Apple Orchards

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 popu...

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Bibliographic Details
Published in:Journal of economic entomology Vol. 113; no. 3; pp. 1411 - 1418
Main Authors: Monteiro, Lino Bittencourt, Witt, Luis Gustavo, Guiloski, Izonete Cristina, Silva dos Santos, Regis Silvori, Silva de Assis, Helena C
Format: Journal Article
Language:English
Published: US Entomological Society of America 06-06-2020
Oxford University Press
Subjects:
Acetylcholinesterase
Analysis
apple tree
Bioassays
Butterflies & moths
Chemical control
Chemical pest control
Chlorpyrifos
Enzymatic activity
Enzyme inhibitors
Fenitrothion
Fruits
Glutathione
Glutathione transferase
Grapholita molesta
insecticide
INSECTICIDE RESISTANCE AND RESISTANCE MANAGEMENT
Insecticides
Insects
Laboratories
management of pest resistance
mating disruption
Orchards
Organophosphates
Pest control
Pest resistance
Pesticides
Pests
Brazil
insecticide
mating disruption
management of pest resistance
apple tree
Grapholita molesta
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Summary: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 (α-NA and β-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 doTenente, Lapa and Porto Amazonas, Fraiburgo, São 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, α and β-NA activity. There is evidence that a diversity of control strategies can provide better resistance management.
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ISSN:0022-0493
1938-291X
DOI:10.1093/jee/toaa023