Abstract

                                Two field experiments were conducted to study the effect of amitraz and selected insecticides either alone or their combinations on the growth and yield components of cotton when used for pest control. in the first experiment, omitraz 004% 0.06% and 0 08% treatments recorded the highest parcentage of increase in yield over untreated control and the lowest porcentage of shedding of reproductive parts due to bollworms as compared to standard monocrolophos 01%) Amitraz treat- ments were effective in increasing both vegetative and reproductive growth of cotton plant and were also effective in inducing early maturity. In the second experiment, growth and yield components were high in endosulfan 005%+amitraz 0.03% monocrotophos 0.05% + amitraz 0.03% and carbaryl 0 1% + amitraz 0.03% treatments as compared to endosulfan 0.1% monucrotophos 0.1% and carbaryl 02% alons respectively. Endosulfan 0.05% + amitraz 0.03% recorded the lowest percen- tage of shedding of reproductive parts due to bollworms. None of the insecticides/ insecticide combination tested was phytotoxic to cotton plant.

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