Secondary Kill of Adult Male German Cockroaches (Dictyoptera: Blattellidae) Via Cannibalism of Nymphs Fed Toxic Baits
- 1 October 1999
- journal article
- Published by Oxford University Press (OUP) in Journal of Economic Entomology
- Vol. 92 (5) , 1133-1137
- https://doi.org/10.1093/jee/92.5.1133
Abstract
Five commercially available bait formulations were evaluated for primary kill of 1st- and 2nd-instar German cockroaches, Blattella germanica (L.), and secondary kill of adult male German cockroaches via cannibalism of bait-fed nymphs. Chlorpyrifos and fipronil baits killed 1st- and 2nd-instar cockroaches significantly faster than hydramethylnon, boric acid, or abamectin baits. Secondary kill was observed for all baits tested. Adults that consumed bait-treated nymphs had significantly higher mortality than those fed untreated nymphs. The LT50 values calculated for secondary kill of adult male cockroaches were 1.84 d for adults consuming fipronil-fed nymphs, 6.69 d for hydramethylnon-fed nymphs, 7.21 d for boric acid-fed nymphs, 7.94 d for abamectin-fed nymphs, and 8.48 d for chlorpyrifos-fed nymphs. Adult LT50 values for boric acid, abamectin, and chlorpyrifos were not significantly different. Because secondary kill was observed for all bait formulations tested, it is possible that the importance of toxicant transmission via cannibalism has been underestimated in laboratory and field evaluations.Keywords
This publication has 0 references indexed in Scilit: