ABSTRACT
The current study was performed to evaluate the efficacy of certain insect growth regulators (IGRs), buprofezin, hexaflumuron, and lufenuron, at different concentrations (0.2, 0.4, and 0.8 ppm) against Rhyzopertha dominica in wheat grains. Our data showed that the three IGRs tested at different concentrations significantly affected the mortality of adults to varying extents. The percentage mortality of adults increased with increasing concentrations and time of exposure. After 21 days of treatment, the highest mortality (80.00%, 78.33%, and 60.00%) was observed at the highest concentration (0.8 ppm) and the lowest mortality (58.33%, 46.66%, and 30.00%) was observed at the lowest concentration (0.2 ppm) of lufenuron, buprofezin, and hexaflumuron, respectively. The tested IGRs reduced fecundity, hatchability, adult emergence, and weight loss in treated wheat grains and increased the developmental period of R. dominica compared with the control.
Subject(s)
Coleoptera , Insecticides , Animals , Insecticides/pharmacology , Juvenile Hormones/pharmacology , Dominica , Edible GrainABSTRACT
The current study was performed to evaluate the efficacy of certain insect growth regulators (IGRs), buprofezin, hexaflumuron, and lufenuron, at different concentrations (0.2, 0.4, and 0.8 ppm) against Rhyzopertha dominica in wheat grains. Our data showed that the three IGRs tested at different concentrations significantly affected the mortality of adults to varying extents. The percentage mortality of adults increased with increasing concentrations and time of exposure. After 21 days of treatment, the highest mortality (80.00%, 78.33%, and 60.00%) was observed at the highest concentration (0.8 ppm) and the lowest mortality (58.33%, 46.66%, and 30.00%) was observed at the lowest concentration (0.2 ppm) of lufenuron, buprofezin, and hexaflumuron, respectively. The tested IGRs reduced fecundity, hatchability, adult emergence, and weight loss in treated wheat grains and increased the developmental period of R. dominica compared with the control.
O presente estudo foi realizado para avaliar a eficácia de certos Reguladores de Crescimento de Insetos (RCIs), buprofezin, hexaflumuron e lufenuron, em diferentes concentrações (0,2, 0,4 e 0,8 ppm) contra Rhyzopertha dominica em grãos de trigo. Nossos dados mostraram que os três RCIs, testados em diferentes concentrações, afetaram significativamente a mortalidade de adultos em graus variados. A mortalidade percentual de adultos cresceu com o aumento das concentrações e do tempo de exposição. Após 21 dias de tratamento, a maior mortalidade (80,00%, 78,33% e 60,00%) foi observada na maior concentração (0,8 ppm) e a menor mortalidade (58,33%, 46,66% e 30,00%) foi observada na menor concentração (0,2 ppm) de lufenuron, buprofezin e hexaflumuron, respectivamente. Os RCIs testados reduziram a fecundidade, eclodibilidade, emergência de adultos e perda de peso em grãos de trigo tratados, bem como aumentaram o período de desenvolvimento de R. dominica em comparação com o controle.