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Title: Effectiveness of flameless catalytic infrared radiation against life stages of three stored-product insect species in stored wheat

Author
item KHAMIS, M - Kansas State University
item SUBRAMANYAM, B - Kansas State University
item DOGAN, H - Kansas State University
item Flinn, Paul
item GWIRTZ, J - Kansas State University

Submitted to: Stored Products Protection International Working Conference Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 5/15/2010
Publication Date: 12/9/2010
Citation: Khamis, M., Subramanyam, B., Dogan, H., Flinn, P.W., Gwirtz, J.A. 2010. Effectiveness of flameless catalytic infrared radiation against life stages of three stored-product insect species in stored wheat. In: Stored Products Protection International Working Conference Proceedings, June 27 - July 2, 2010, Estoril, Portugal. p. 695-700.

Interpretive Summary:

Technical Abstract: A benchtop flameless catalytic infrared emitter was evaluated in the laboratory to disinfest wheat containing different life stages (ages) of the lesser grain borer, Rhyzopertha dominica; rice weevil, Sitophilus oryzae; and red flour beetle, Tribolium castaneum. The emitter produces infrared in the 3 to 7 um range. A non-contact infrared thermometer obtained real-time grain temperatures during exposures of uninfested and infested wheat containing various life stages of the three insect species. The grain temperatures attained were influenced by wheat quantity, distance from the emitter, and exposure time, which in turn influenced effectiveness against various life stages of the three species. In general, higher grain temperatures were attained in 113.5 g of wheat as opposed to 227.0 g, at 8.0 cm from the emitter surface rather than at 12.7 cm, and during a 60-sec exposure compared to a 45-sec exposure. Logistic regression indicated the probability of death of various life stages of R. dominica, S. oryzae, and T. castaneum was temperature-dependent. About 99 to 100% mortality of all life stages of the three species occurred when the mean wheat temperatures were in the range of 108 to 114°C. The promising results show flameless catalytic infrared technology to be a viable option for disinfestation of stored wheat, provided such high temperatures do not affect grain quality.