تأثير تجويع الأعمار اليرقية المختلفة لدودة ورق القطن Spodoptera littoralis (BOLSD.)‎ (Lepidoptera : Noctuidae)‎ على بعض الجوانب الحياتية لها

Abstract EN

At constant laboratory conditions of 25+ 1 C° and 70 +3 % R.H., 1st.

- 6 th.

instar larvae of the cotton leaf-worm, Spodoptera littoralis (BOISD.) (Lepidoptera: Noctuidae), tolerated starvation for mean periods of 18,23,40,59,61 and 71 h., respectively.

Starvation of 1 st.

or 2 nd.

instars prevented molting.

Starvation of 3 rd.

or 4 th.

instars allowed 2 % of the larvae to continue development.

Starvation of 5 th.

or 6 th.

instar larvae resulted in 45 and 97 % larval survivals, respec-tively.

Starvation of 6 th.

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 1 St., 2 nd., 3 rd.

or 4 th.

larval instars.