EFFECT OF ADDING SOME LOCAL MATERIALS ON THE PHYSICO-CHEMICAL PROPERTIES INSECTICIDES AND BIOLOGICAL ACTIVITY OF CERTAIN

Abstract

For integrated pest management, the minimal usc of pesticides is a goal to conserve the environment natural enemies. Field and laboratory experiments were carried out to investigate the role of the local materials which might serve as additives to increase the insecticidal efficiency and reduce the dosage rate of the recommended dose to about 50% of candidate insecticides against the cotton leafworm, Spodoptera littoralis. Data indicated that most compatible additives showed improvements in the physico-chemical properties of candidate insecticidal spray solutions. Such improvements led to increase in their retention and deposit on the treated plant surface. Examination of the results indicated that all the synergistic additives increased the initial and residual effect for all combinations except ascorbic acid when added to carbaryl. As a result of increasing the residu­ al effect, the dosage rate of candidate insecticides could be reduced to about 50% of the recommended dose "hen combined with those materials. It could be con­ cluded that the six investigated additives appeared promising in combinations with tested insecticides as recorded in laboratory and field investigations except ascor­ bic acid when added to carbaryl. The dosage rate of cyanophos could be reduced . to about 50% of the recommended dose when used in combination with ascorbic acid at 0.2%, castor oil at 50%, and glue at 0.3%. Also, the dosage rate of deenate could be reduced to about 50% of its recommended dose when combined