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1 April 2014 Residual Efficacy of Chlorfenapyr for Control of Stored-Product Psocids (Psocoptera)
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The residual effect of chlorfenapyr (Phantom) was evaluated for residual control of three stored-product psocid species: Liposcelis bostrychophila Badonnel, Liposcelis entomophila (Enderlein), and Liposcelis paeta Pearman (Psocoptera: Liposcelididae). Chlorfenapyr was applied to individual arenas with a concrete surface at rates of 0, 2.8, 13.8, 20.6, 27.5, 55, and 110 mg active ingredient (AI)/m2. Adults were exposed on the treated arenas and mortality assessed after 1, 2, and 3 d. The procedures were repeated weekly on the same treated arenas for 3 wk to assess residual efficacy. At each week, mortality of all species was low after 1 d of exposure but notably increased after 2 or 3 d. L. entomophila was the most susceptible species, with 99–100% mortality at rates of 13.8 mg/ m2 or higher. Similarly, mortality of L. paeta after 3 d of exposure at the same concentration ranged from 92 to 100%. L. bostrychophila was the least susceptible species, with mortality of <60% during the third week after application at rates ≤27.5 mg/m2. However, even for this species, mortality after 3 wk was 90% or higher at rates >27.5 mg/m2. Complete mortality of all species occurred after 3 d exposure at the highest rate tested of 110 mg/m2. Thus, our results show that chlorfenapyr is effective against major psocid species at the application rates evaluated in this study.

Christos G. Athanassiou, Nickolas G. Kavallieratos, Frank H. Arthur, and James E. Throne "Residual Efficacy of Chlorfenapyr for Control of Stored-Product Psocids (Psocoptera)," Journal of Economic Entomology 107(2), 854-859, (1 April 2014).
Received: 29 August 2013; Accepted: 1 November 2013; Published: 1 April 2014

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