THE ROLE OF CULTIVARS AND SOWING DATE IN CONTROL OF BROAD BEAN WEEVIL (BRUCHUS RUFIMANUS BOH.) IN ORGANIC CULTIVATION

During 2010-2011 the studies were conducted on the cultivation of three broad bean cultivars Windsor Bia?y, Makler and Bartom with organic and conventional method. The aim of research was to determine the influence of cultivar and sowing date on the seed damage caused by broad bean weevil and on the total seed yield. Seeds were sown on April 10 and 20th. At the harvest the yield was divided into following grades: marketable, small seeds, damaged by Bruchus rufimanus Boh. and diseased. Plants selected on each plot were examined towards the relation between plant architecture and seed damage. The effect of applied treatments on seed yield and damage was found. The lowest percentage of injured seeds presented cv. Makler irrespectively on sowing date and growing method. The differences were proved statistically. Delay of sowing restricted the percent of damaged seeds but also decreased the yield in both growing methods. Cluster located at upper parts of a plant contained lower amount of damaged seeds.