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Survey of insecticide resistance in Mexican populations of maize weevil, Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae)


Survey of insecticide resistance in Mexican populations of maize weevil, Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae)



Journal of Stored Products Research 35(1): 107-115



ISSN/ISBN: 0022-474X

DOI: 10.1016/s0022-474x(98)00017-4

Topical application bioassays of DDT, lindane, malathion, pirimiphos-methyl, deltamethrin, and permethrin were undertaken with 11 held strains of maize weevil, Sitophilus zeamais Motschulsky, collected from nine states in Mexico. Concentration-mortality regression lines were estimated to compare the resistance ratios for each insecticide and strain. For each insecticide, resistance ratios were determined relative to the most susceptible strain. The field-collected strains showed low to moderate levels of resistance to DDT (1.3- to 14.1-fold), moderate to high levels of resistance to lindane (4.7- to 20.9-fold), low to high levels of resistance to malathion (1.6- to 31.4-fold), and low levels of resistance to pirimiphos-methyl (3.0- to 3.7-fold), deltamethrin (1.2- to 1.8-fold), and permethrin (2.3- to 3.5-fold). This is the first report of high levels of lindane and malathion resistance in strains of S. zeamais in Mexico. Given this information, I conclude that insecticide resistance in S. zeamais in Mexico is important, and may become a more serious problem in the future.

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Accession: 003290036

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