A composition comprising a pesticide (A) selected from avermectin and a photo-protecting agent, wherein the mean diameter of the pesticide (A) particles is from 0.1 to 100 &mu；m and where the amount of photo-protecting agent in the composition does not exceed 20% of the total weight of the pesticide (A) particles plus the agent, and its use in agriculture. The avermectin particles are preferably coated with the photo-protecting agent.
