A Gardona-Vapona Mixture for Control of Stored-product Insects in Railway Boxcars1

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Abstract
Adult confused flour beetles, Tribolium confusum Jacquelin duVal, adult granary weevils, Sitophilus granarius (L.), adult lesser grain borers, Rhyzopertha dominica (F.), and Trogoderma inclusum LeConte larvae were exposed in railway boxcars to 3 dosages of a Gardona®: Vapona®, (2-chloro-1-[2,4,5-trichlorophenyl] vinyl dimethyl phosphate): (2,2-dichlorovinyl dimethyl phosphate) formulation. Following application, some of the Vapona concentrations were monitored. With few exceptions a 3.78 liter/boxcar application rate provided 80–100% mortality of the test insects. However, all dosages above 0.95 liter/boxcar resulted in a Vapona air concentration above the 1 mg/liter allowed for human exposure.

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