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Title: Residual efficacy of pyriproxyfen and Hydroprene applied to wood, metal, and concrete for control of stored-product insects

item Arthur, Franklin

Submitted to: Pest Management Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 12/16/2008
Publication Date: 4/9/2009
Citation: Arthur, F.H., Liu, S., Zhao, B., Phillips, T.W. 2009. Residual efficacy of pyriproxyfen and Hydroprene applied to wood, metal, and concrete for control of stored-product insects. Pest Management Science. 67(7): 791-797. Doi:

Interpretive Summary: Pyriproxyfen (trade name Nylar®) is a new insect growth regulator that has been tested on insect pests of field crops but not on stored-product insects. We conducted a test by exposing older larvae of four beetle species and the Indian meal moth on plywood, metal, and tile treated with Nylar and Gentrol®, which is also an insect growth regulator. Nylar gave generally greater residual control, as determined by adult emergence of exposed larvae, than Gentrol on all surfaces, even though it was applied at much lower rates. Gentrol was most persistent on metal compared to wood and concrete. The Indianmeal moth larvae were generally more tolerant to both insecticides than the beetle larvae, but there were variations in susceptibility among the different beetle species. However, the overall results showed that Nylar was effective and it could be used as a residual surface treatment in management programs for control of stored-product insects.

Technical Abstract: Pyriproxyfen and hydroprene are insect growth regulators (IGRs) that have been evaluated to control insect pests of field crops, but there are limited reports of efficacy against stored-product insects. A laboratory study was conducted to determine residual efficacy of pyriproxyfen and hydroprene on wood, metal, and concrete surfaces. Pyriproxyfen was applied to the surfaces at 1.15 and 2.3 mg active ingredient [AI]/m2 while hydroprene was applied at the label rate of 19 mg [AI]/m2. Late-instar larvae of Tribolium confusum, Tribolium castaneum, Oryzaephilus surinamenis, Lasioderma serricorne, and Plodia interpunctella were exposed with a food source on the treated surfaces. Hydroprene was the least persistent IGR on concrete and generally the most persistent on metal. Pyriproxyfen gave greater residual persistence than hydroprene and there was no consistent difference in efficacy among the three surfaces. Efficacy varied among the five insect species, but generally P. interpunctella was the most tolerant species to both IGRs. Pyriproxyfen gave effective residual control of primary stored-product insect species by inhibiting adult emergence of exposed larvae. Results show pyriproxyfen can be a useful addition for pest management programs in mills, warehouses, and food storage facilities.