1. a Institute of Pesticides and Environmental Protection , Banatska 31‐b, Zemun‐Belgrade, 11080, Yugoslavia
2. b Teodora Drajzera 9, P.O. Box 936, Institute for Plant Protection, Belgrade, 11001, Yugoslavia
3. c Faculty of Agriculture, Department of Pesticides , Nemanjina 6, Zemun‐Belgrade, 11080, Yugoslavia