Time-concentration interplay in insecticide resistance among populations of the Neotropical coffee leaf miner,Leucoptera coffeella |
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| Authors: | Suzany A Leite Mateus P dos Santos Daniela R da Costa Aldenise A Moreira Raul Narciso C Guedes Maria A Castellani |
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| Institution: | 1. Department of Crop Science and Animal Science, State University Southwestern Bahia, Vitória da Conquista, Brazil;2. Department of Entomology, Federal University of Viçosa, Viçosa, Brazil |
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| Abstract: | - Leucoptera coffeella is one of the main coffee pests in the Neotropical region and particularly important in crops cultivated under full sun, as in Brazil. The intensive use of insecticides in the last two decades, including molecules of recent use such as chlorantranilprole, has not been successful in suppressing this pest species.
- Thus, study aimed to detect insecticide resistance and determine the levels of resistance to commercial formulations of the insecticides chlorantraniliprole, chlorpyrifos and thiamethoxam in populations of L. coffeella from Arabica coffee fields in western and the highlands of the state Bahia (Brazil). Furthermore, as the expression of insecticide toxicity varies with the length of exposure and the compound concentration, what is frequently neglected, these two variables were considered while determining the levels of resistance in nine populations.
- Moderate levels of resistance were detected to chlorantranilprole in two populations, whereas the others exhibited low levels of resistance. All populations were resistant to thiamethoxam ranging from low to moderate levels. Low levels of resistance to chlorpyrifos were detected in all populations from western, but none from highlands region.
- The western presents a more concerning scenario of insecticide resistance the L. coffeella, but the phenomenon requires attention in both regions.
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| Keywords: | chemical control chlorantraniliprole chlorpyrifos Coffea arabica resistance ratio thiamethoxam |
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