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ARS Home » Plains Area » Manhattan, Kansas » Center for Grain and Animal Health Research » Stored Product Insect and Engineering Research » Research » Research Project #431611

Research Project: Efficacy of Two Formulations of Centynal® (deltamethrin) as a Long-Term Commodity Protectant

Location: Stored Product Insect and Engineering Research

Project Number: 3020-43000-033-23-T
Project Type: Trust Fund Cooperative Agreement

Start Date: Jun 1, 2015
End Date: May 31, 2020

The objective of this test is to evaluate a new formulation of the insecticide deltamethrin, alone and combined with the insect growth regulator methoprene, as a protectant of stored grains. Cooperate with Central Life Sciences to determine if a new insecticidal formulation of the insecticides pyrethrin plus methoprene, and the synergist piperonyl butoxide, can replace older insecticides for inclusion into pest management programs for stored product insects.

Tests will be conducted on wheat, corn, and brown rice. Test insects for wheat and brown rice will be the lesser grain borer and the rice weevil, test insects for corn will be the maize weevil and the red flour beetle. There will be 10 treatments: the existing Centynal formulation used alone (label rate of 0.5 ppm) or combined with 1.25 or 2.5 ppm Diacon IGR, the new Centynal formulation used alone (at 0.5 ppm or 5 ppm) or combined with the two rates of Diacon IGR, along with an untreated control. Residual testing period will be 12 months. Experimental methods would be as follows. We will have four replicates of 25lb (11 kg) treated lots stored in 5-gallon buckets, which are in turn stored on the floor of one of our grain bins at the Center. Bioassays will be conducted every two months by placing 10 adults of the test species in vial containing 100-kg of the treated commodity, and holding these vials for three months. Tests will be conducted by treating different commodities with the insecticide, taking samples every three months, and exposing selected stored product insects on the commodities to determine if insects can be killed before the cause economic damage. Tests will also be conducted to determine how long the insecticide can control dermestid insect larvae on different flooring surfaces.