Phenotypic and molecular analyses in rice weevil, <i>Sitophilus oryzae</i> (<scp>L</scp>inneaus) (<scp>C</scp>oleoptera: <scp>C</scp>urculionidae): identification of a <i>super kdr</i> mutation, <scp>T929I,</scp> conferring resistance to deltamethrin

Abstract

Both phenotype and molecular marker analyses clearly demonstrated that deltamethrin at 180 and 1000 ppm can be used to discriminate weakly and strongly resistant populations in S. oryzae, respectively. Resistance diagnostics based on the mutation, T929I, supports our phenotypic data and indicates that resistance to deltamethrin in S. oryzae is prevalent in southern parts of India, stressing the need to identify a synergist or suitable alternatives. © 2021 Society of Chemical Industry.