Toxicity comparison of Three IGR Agents on Oryzaephilus surinamensis L. (Col., Silvanidae) Under Laboratory Conditions

The saw-toothed grain beetles, Oryzaephilus surinamensis L. (col., Silvanidae) is one of the most important pests that damage to stored products in Iran. The efficacies of three IGR insecticides, Tebufenozide, Chromafenozide and Lufox® have been evaluated on eggs and larval stages of O. surinamensis during this study. The Efficiencies of these  insecticides have been  considered by different concentrations on one day old eggs, 5 day old (young) and 19 day-old  larvae. The results of bioassay tests showed that Lufox® has the most and Tebufenozide has the least efficacy on eggs and larval stages. Also, the mortality effects directly increased by raising the IGRs concentrations. In the other aspect, the eggs of O. surinamensis were the most susceptible stage in response to IGR insecticides. The LT50 value of Lufox® was shorter than that of Tebufenozide and Chromafenozide. Finally the high toxicity and strongest efficiency can be resulted by using of Lufox® in comparison with Tebufenozide and Chromafenozide.