The effect of late sowing of pinto bean, line COS16 on population and damage of Empoasca decipiens and Thrips tabaci

In order to study the effects of sowing date and damage of two insect pest, Empoasca decipiens Paoli (Hemiptera.:Cicadellidae) and Thrips tabaci Lindeman (Thysanoptera: Thripidae) on seed yield and yield components of pinto bean, line COS16, an experiment was conducted at Boroujerd Agricultural Research and Education Campus, in  2008 and 2009. The experiment design was a split plot arranged in RCBD with 4 replications. Two pest managements (spraying with pesticide and no spraying) were assigned to main plots and three sowing date (early May, late May and mid June) were randomized to subplots. The results showed that except of seed yield, more of yield components were not significantly decreased by these pests. Results of combined analysis of variance, showed that, seed number per plant, weight of seeds per plant, 100-seed weight, seed yields and pest damage index were significantly affected by sowing dates. Based on this study, the highest yield components (pod number/plant, seed number/plant and seed weight/plant) were obtained in the first sowing date. The lowest pest damage indices was in the third sowing date, which was significantly different with the first and second sowing dates.