EFFECT OF DIFFERENT HOST PLANTS AS LARVAL FOOD ON DEVELOPMENT AND FECUNDITY OF THE COTTON LEAFWORM, SPODOPTERA LITTORALIS (BOISD.)

Document Type : Original Article

Authors

Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt

Abstract

The effect of different host plants as larval food on the develop­ment and the fecundity of Spodoptera littoral's (Boisd.) was investigated in the laboratory under 15±0.5C and 65±5% RH. Suitable larval food was mallow (shortest larval period with lowest larval mortality and heavi­est pupae without deformities). Castor affected the fecundity by the highest numbers of eggs. Strawberry affected intrmediately the devel­opment and the fecundity of the pest while no oviposition occurred from moths resulting from larvae reared on kidney beans or squash. The cot­ton hybrid 85 (Upper Egypt 93) was the most suitable larval food among the cotton hybrids and varieties (shorter larval and pupal periods, lower larval mortality and pupal deformities, higher egg numbers and egg masses). The cotton hybrid Giza 83 (Upper Egypt 93) was the least suitable larval food (prolonged larval and pupal periods and higher larval mortality with shortest oviposition period and the least number of de­posited eggs).

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