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

Abstract

Reduced susceptibility in field strains may be due to inherent formulation deficiency and low levels of tolerance or resistance to β-cyfluthrin. No single insecticide provided adequate control of the three species tested.

Residual efficacy of deltamethrin and β-cyfluthrin against Trogoderma variabile and Trogoderma inclusum (Coleoptera: Dermestidae)

“…Field strains of stored product insects can vary in their response to contact insecticides, and can be more tolerant than laboratory strains (Sehgal et al, 2013(Sehgal et al, , 2014. In our study there was comparatively little difference in susceptibility of T. variabile and T. inclusum to either deltamethrin or b-cyfluthrin, though the former was a laboratory strain and the latter was a field strain.…”

“…Although there have been some studies on evaluation of the efficacy of b-cyfluthrin against stored product insects (Arthur, 2000;Toews et al, 2009Toews et al, , 2010Athanassiou et al, 2013;Sehgal et al, 2014), there are no data on the new deltamethrin formulations, or little published information on the efficacy of these products related to residual efficacy on dermestid species. The new formulation of b-cyfluthrin, Tempo ® SC Ultra, has replaced the previous emulsifiable concentrate [EC] and wettable powder [WP] formulations (Arthur et al, 2015).…”

Susceptibility of Tribolium castaneum (Coleoptera: Tenebrionidae) and Trogoderma inclusum (Coleoptera: Dermestidae) to cold temperatures

“…The T. castaneum strain was a field-collected strain that had been in culture since 2005, while the T. inclusum strain was collected from the field in 2012 and cultured in the lab since that time. There are studies that show field strains of stored product beetles can vary in their susceptibility to insecticides, and may be more tolerant than pesticide-susceptible strains that have been reared for long time periods in the laboratory (Sehgal et al, 2013(Sehgal et al, , 2014. Thus, while our results can be used as general guidelines for susceptibility of different life stages of T. castaneum and T. inclusum and to compare relative susceptibility of the two species, field strains exist in fluctuating temperatures and may show susceptibility different from our results.…”

Susceptibility of Trogoderma granarium Everts and Trogoderma inclusum LeConte (Coleoptera: Dermestidae) to residual contact insecticides

“…Thissuggests potential exposure of the field strains to insecticides and thus greater natural tolerance. There are number of studies that report reduced susceptibility to insecticides in field strainsof stored-product insects compared to laboratory strains (Sehgal et al, 2013(Sehgal et al, , 2014Kljajic and Peric, 2006).…”