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Abstract Four novel insecticides with mode of action different than that known with the conventional insecticides were evaluated for their potency against bollworm larvae Earias insulana (Boisd.) and Pectinophora gossypiella (Saund.). Three conventional insecticides recommended for bollworm control were used for comparison. Under laboratory conditions emamectin- benzoate was the most potent compound followed by indoxacarb, while the OP compound was the least toxic one. Joint action between the novel and conventional insecticides were tested under laboratory conditions at LC 25 levels .Results indicated that the most potentiation effect was recorded with the mixture (imidacloprid+alpha-cypermethrim). An experiment was conducted at 2012 and 2013 seasons at sakha agricalture research station using cotton Var GIZA 86. Three sprays were applied from each insecticide at interval of 15 days. The obtained results indicated that the four used novel compounds, were significantly more effective against bollworm larvae than the three used conventional ones. The least significant effect was observed with the carbamate compound methomyl. Results reflected that the novel compounds were long acting on bollworm larvae than the conventional compounds. Data indicated that potentiation of the effect was recorded when mixtures of imidacloprid with the three conventional insecticides were applied under field conditions which was more significant with alpha-cypermethrin. The results concluded that, the four tested insecticides can used effectively in controlling bollworms and a mixure of imidacloprid with alpha-cypermethrin can be used effectively for controlling bollworms in cotton.To study the antioxidant properties of imidacloprid compared with salicylic,they were applied at early and late season (in a field study).Some enzymes and nonenzymatic component in cotton extracts were analyzed.Data showed that a significant reduction was recorded with glutathione reductases, transferases, catalases and peroxidases with imidacloprid treatment ,While salicylic acid exhibited slight increase in activity. The activity of polyphenol oxidase was increased with slight ratioes in all treatments. Total protein content was increased after all treatments.While imidacloprid decreased H202 content salicylic increased it. Finally the major phenolic syringic acid was completely absent with both compounds at early treatment while it was reduced by intermediate ratio with late season. The other major phenolic compounds increased following early seasons, but decreased after late one. |