Potency of Esrel and Reldan on some biological and biochemical aspects of cotton leaf worm Spodoptera Littoralis (Boisd.) [electronic resource].

Includes references.

The present study aims at comparing the effect among Esrel as plant growth regulator (PGR),Reldan (organophosphorus insecticide) on the lethal effects of tow compound in the cotton leaf worm Spodoptera littoralis larvea as well as the effects of sublethal on development and reproduction of surviving insects. and biochemical parameters . On basis of this knowledge it will be possible to design combinations and strategies for use of both ingredients in Integrated Pest Management Programmes.The response of, S. littoralis to lethal and sublethal concentrations of Esrel and the conventional insecticide reldan were determined using leaf dipping technique. Result showed that mortality of the newly molted 4th instar larvae increased with the concentration resulting LC50 values of 2.89x105ppm and 85.83 ppm after 5 and 2 days, for Esrel and reldan respectively. Sublethal effects were studied by treating the 4th instar larvae with a concentration equivalent to LC50 . The larval development time from treatment until pupation was prolonged significantly in both treatments. The pupation period of the survivors was shorted in both sex but was significantly with female pupa and without significantly with male pupae with the two products treatments.

Summary in Arabic.

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