Some Biological Studies of the Cotton Leaf-Worm Spodoptera littoralis (Boisd.) Lepidoptera: Noctuidae

Abstract

Cotton leaf- worm Spodoptera littoralis (Biosd.) was considered to be an important economic insect pest on Solanacae plants, the insect cause damage to the seeding, leaves, flowers and fruits. The insect's life cycle was studied under four different temperatures included 15, 20, 25, 30C°, The Laboratory results revealed that the great influence of  the temperature on the development periods of the insect stages being was  10.67 ,34.16 ,4 ,22.3 and 71.13 Days for eggs , larvae ,pre- pupae , pupae and total life cycle respectively eggs to adults was From at 20C°, while it was  3.2 , 15.5 , 1.1 , 8.6 and 28.22 days respectively for eggs, larvae, pre-pupa, pupae and to adults respectively at 30 C°. The temperature 15C°did not suitable for larval development, therefore,it was neglected.