Efficacy Determination of Commercial Deltamethrin-Treated Storage Bags on <i>Trogoderma granarium</i> Everts Adults and Larvae
2020
Deanna S. Scheff | Frank H. Arthur | Scott W. Myers | Michael J. Domingue
<i>Trogoderma granarium</i> Everts, the khapra beetle, is a serious stored product pest known to feed on >100 different products worldwide and is a major threat to global food security. Deltamethrin-treated storage bags are a resource that could be used to limit infestations during storage of grain in bags. We investigated the efficacy of deltamethrin-treated bags against <i>T. granarium</i> adults and larvae. Deltamethrin-treated and untreated packaging materials were affixed into the bottom of plastic Petri dishes (62 or 137 cm<sup>2</sup>) to create a bioassay arena. Adult <i>T. granarium</i> were exposed and observed to determine the time to knockdown and the subsequent mortality rate within 24 h. Adult <i>T. granarium</i> were knocked down in <60 min, and 100% of adults were knocked down or dead after 24 h. <i>Trogoderma granarium</i> larvae were exposed for 0.33, 1, 2, 3, or 4 d or continually exposed and monitored for larval death and adult emergence. Larvae exposed for 4 d had 50% mortality versus 97% if continually exposed. Utilizing this deltamethrin-treated packaging could cause disruptions in natural populations of <i>T. granarium</i> found in storage facilities, and the treated packaging is an effective tool that could be implemented into an integrated pest management program for bagged grain.
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