TAXONOMY Effect of sub-lethal concentrations of the insecticides buprofezin and lufenuron on some nutritional parameters of cotton leaf worm Spodoptera littoralis (Boisd) N.M. Mallah (Iraq) Pages 193-199 CHARACTERIZATION Molecular characterization of some Syrian isolates of Tomato mosaic virus F. Ismaeil, A.A. Haj Kasem, S. Al-Chaabi and A. Abdulkader (Syria) Pages 200-207 METHODOLOGY Improve the efficiency of aphids to screen