Some bio-ecological observations on asymmetrasca decedens and empoasca decipiens (homoptera: cicadellidae)

This study was conducted in cotton, maize, and wheat fıelds, and in peach, plum, citrus and quince plantations placed in the Adnan Menderes University Faculty of Agriculture. Cicadellids were sampled by using sticky traps and svveeping net. As a result, it was determined that A. decedens and E. decipiens overwintered in adult female stage in Aydın. So, it is supposed that these female adults have already mated before overwintering. That was the reason that spring hoşt plants were important for the population dcvelopment. The fırst generation has occured on wheat, plum, peach, and apricot. Second and thirth generations have occured on summer crop plants. The last fourth generations occured on citrus and quînce in autmn. in general, A. decedens and E. decipiens were abîe to feed on many kind of plants from early spring to İate fail. They constituted higher popiilations on cotton than the other hosts. So, it was important that cotton fıelds contributed to the İate popiilations. On the other hand, since cicadellids were active from early spring to İate fail and were able to feed on many hosts and additionally having high breeding potential, their populations eould reach to high levels in a short periot. Key words Asymmetrasca decedens, Empoasca decipiens, hosts, population, sampling.