[Effect of starvation of the different larval instars of the cotton-leaf-worm, Spodoptera littoralis (BOISD.). (Lepidoptera: Noctuidae) on certain aspects of its Biology]
1992
El-Sherif, S.I. (j"a:mi3at al-qa:hirat (Egypt). Kuliyyat al-zira:3at) | Badr, N.A.A.
At constant laboratory conditions of 25+1 deg and 70+3 R.H., 1st 6th instar larvae of the cotton leaf-worm, Spodoptera littoralis (BOISD.) (Lepidoptera: Noctuidae), tolerated starvation for mean periods of 18, 23, 40, 59, 61 and 71h, respectively. Starvation of 1st or 2nd instars prevented molting. Starvation of 3rd or 4th instars allowed 2 of the larvae to continue development. Starvation of 5th or 6th instar larvae resulted in 45 and 97 larval survivals, respectively. Starvation of 6th instar larvae affected certain aspects of the pest's biology including significant decreases of pupal period, pupal weight and egg-laying capacity. Adult moths failed to emerge when starvation occurred during the 1st, 2nd, 3rd or 4th larval instars
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