Delayed mortality responses of Rhyzopertha dominica (F.) adults subjected to short exposures on spinosad-treated wheat

Variation in susceptibility of laboratory and field strains of three stored‐grain insect species to β‐cyfluthrin and chlorpyrifos‐methyl plus deltamethrin applied to concrete surfaces

“…The fact that there is recovery indicates that the insecticides did not exhibit any delayed effects. Delayed mortality effects have been reported in R. dominica 43,44 but not in Sitophilus oryzae after short exposures to spinosad-treated wheat. 44 In the present study, β-cyfluthrin was found to be more effective at the room temperature of 24 to 25 • C than at 28 • C against Tribolium castaneum and Oryzaephilus surinamensis.…”

“…The fact that there is recovery indicates that the insecticides did not exhibit any delayed effects. Delayed mortality effects have been reported in R. dominica but not in Sitophilus oryzae after short exposures to spinosad‐treated wheat…”

Efficacy of partial treatment of wheat with spinosad against Rhyzopertha dominica (F.) adults

“…Exposing R. dominica adults to this rate for 14 d caused a significant reduction in progeny production. Moreover, a brief exposure to spinosad residues is sufficient to cause mortality of R. dominica adults which is typically manifested as delayed toxicity, even after removal of adults from treated grain (Getchell and Subramanyam, 2008;Athanassiou et al, 2010;Boina et al, 2012). Athanassiou et al (2009) reported that 83% of R. dominica adults were dead in 14 d when they were released on surface of wheat kernels in a plastic vial in which only the top 1/8th layer was treated with spinosad.…”