Journal of Economic Entomology (1998) 91, 309-319

Frank H. Arthur (1998)
Residual studies with cyfluthrin wettable powder: Toxicity toward red flour beetles (Coleoptera: Tenebrionidae) exposed for short intervals on treated concrete
Journal of Economic Entomology 91 (1), 309-319
Abstract: Red flour beetles, Tribolium castaneum (Herbst), were exposed for 0.5, 1, 2, and 4 h on concrete treated with 20% cyfluthrin wettable powder at rates of 100, 150, and 200 mg (20, 30, and 40 mg [Al] /m²). Beetle recovery was assessed at 0, 24, 48, and 168 h postexposure, and residual bioassays were conducted at 3-wk intervals for 24 wk after treatment. At the low application rate of 100 mg/m², initial knockdown after exposure increased as the exposure interval increased, but by week 18, 60-80% of the beetles had recovered and were mobile after 168 h postexposure. As the application rate increased to 150 and 200 mg/ m², initial knockdown increased as the exposure interval increased, and survival decreased after 168 h postexposure. The percentage of beetles that remained mobile after they were exposed on the treated concrete was usually correlated with the percentage that were active at 168 h postexposure. Of the 48 possible concentration-exposure-recovery combinations, 4 were described by nonlinear regression, 33 were described by linear regression, and regressions on week were not significant for the remaining 11combinations (P > 0.05). The period during which survival was < 10% was 3.7-10.5 times longer for beetles exposed to the maximum label rate of 200 mg/ m² compared with the minimum label rate of 100 mg/m².
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Database assignments for author(s): Frank H. Arthur

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Tribolium castaneum	Stored grain
	Tribolium castaneum	Stored nuts