Efficiency of certain insecticides and insect growth regulators alone or in mixture with chlorpyrifos for the integrated control of the Egyptian cotton leafworm

The scientists of pest control and environmental protection oriented their activities to control or at least to limit the environmental pollution. Alternative pest control methods represent the major target of many research programs all over the world because of its impact on decreasing the manipulation of pesticides which led to environmental pollution. The efficiency of certain insecticides and insect growth regulators (IGRs) alone or in combinations with chlorpyrifos against the cotton leafworm, Spodoptera littoralis (Boisd.) for integrated management was carried out under field conditions. The results revealed that the acute insecticide, chlorpyrifos was highly effective (100% initial kill) while, the tested IGRs have low initial effect but relative high residual effect. The mortality percentages were increased by increasing factor about 1.7 and 1.3 after mixing of chlorpyrifos with chlorfluazuron according to residual effect and general effect, respectively. Also, the increasing factor was about 1.2 for (oxymatrine/prosuler) and chromafenozide. The insecticidal efficiency (initial, residual and general effect) was improved by Tank-mixing of half recommended rate of the insecticide, chlorpyrifos with that of IGR, chlorfluazuron or chromafenozide. Therefore, the mixture of chlorpyrifos (500 ml/Fed.) with either chlorfluazuron (200 ml/Fed.) or chromafenozide (12.5 g/Fed.) can be integrated in an IPM program on cotton crop against the Egyptian cotton leafworm, S. littoralis.