Resistance of ten red common bean (Phseolus vulgaris) genotypes to Onion thrips (Thrips tabaci) under field conditions

Onion thrips, Thrips tabaci Lindeman, is a serious pest of a wide range of economically important crops in many parts of the world. Common bean, Phaseolus vulgaris L. is one of the most important host plants of this pest in Lorestan province. This research was conducted to investigate the resistance of ten genotypes of red common bean to T. tabaci under field conditions in Borujerd, Lorestan province, Iran in 2014. In this research the responses of T. tabaci to ten red common bean genotypes was examined in a randomized complete block design with three replications. The results showed that there were a significant differences among the number of Thrips on genotypes in different sampling dates. According to the number of first and second instar larvae of T. tabaci, out of 10 red common bean genotypes, KS31285 and KS31169, respectively, with average of 0.323 and 0.331 thrips/plant were as susceptible genotypes, KS31288, KS31286, KS31290, KS31292 and KS31287, respectively, with average of 0.210, 0.206, 0.262, 0.241 and 0.208 thrips/plant were as semi susceptible genotypes and KS31289, KS31291 and Goli, respectively, with average of 0.196, 0.179 and 0.191 thrips/plant were as resistant genotypes to T. tabaci.