white spot on leaves is a symptoms of grey mildew and bacterial leaf blight of cotton.at this stage sucking pest symptoms also observing.
Management:
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for white spot and sucking pest of cotton spray Kresoxim-methyl 44.3% SC@10 ml + difenthuron 50% WP@20g + amino acid@40 ml/15 liters of water.
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after above solution install pheromone trap, light trap and bird purches in the field.