Editorial board Sustaining Members of ASPP RESEARCH PAPERS Effect of photoperiod on the biology of different stages of the cotton leaf-worm, Spodoptera littoralis (BOISD.) (Lepidoptera: Noctuidae). S.I. El Sharif, E.A. Nasr and N.A.A. Badr (EGYPT) Pages 3-7 Effect of cooling on certain biological aspects of the different stages of the cotton leaf-worm, Spodoptera littoralis (BOISD.) (Lepidoptera: Noctuidae). S.I. El