Susceptibility of larval stage of Tribolium confusum Duval (Col., Tenebrionidae) to IGR insecticides in vitro

Subject Areas : entomology and othea arthropods

S. Loni ¹ (Department of Entomology, Islamic Azad University, Arak Branch, Young Researchers club of Arak, Iran)
H. Farazmand ² (Iranian Research Institute of Plant Protection, Tehran, Iran)
A. Sheikhi-Gorjan ³ (Iranian Research Institute of Plant Protection, Tehran, Iran)
Z. Rafiei-Karahrodi ⁴ (Entomology Department, Agricultural faculty, Islamic Azad University, Arak, Iran)

Received: 2009-11-16 Accepted : 2010-06-03 Published : 2010-08-23

Keywords:

Abstract :

Confused flour beetle, Tribolium confusum Duval (Col., Tenebrionidae) is one of the most      important stored product pests in Iran. Regarding the environmental risks of pesticides, scientists are exploring substitute compounds with less hazard to man and environment, such as RGRs. The purpose of this project is to evaluate the efficacy of three IGR insecticides, Teflubenzuron, Hexaflumuron and Pyriproxyfen on T. confusum larvae in laboratory condition. Different concentrations of the above insecticides have been used on 3-4 (young) and 17 day-old (old) larvae. Bioassay tests showed that Teflubenzuron (LC50=116.47) and Hexaflumuron (LC50=307.04) had the most and the least efficacy on young larvae, respectively. The most and the least efficacy, on old larvae have been induced by Teflubenzuron (LC50=135.51) and Pyriproxyfen (LC50=1513.95), respectively. Results showed that, mortality was directly correlated with the IGRs concentrations, and so young larvae of T. confusum were the most susceptible to IGR insecticides. These results revealed that, Teflubenzuron, chitin biosynthesis inhibitor, were the most effective and can be used safely for controling pest.