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Nine species of aphids have been identified in fruit plantations in the Crimea. The species composition and percentage varies depending on the zoning of the plantings. The correlation coefficient between the hydrothermal conditions of April-June and the number of green apple aphids r=0,55, and gray apple (rosy leaf-curling) aphids - r=0,46. Mass reproduction of apple aphids was recorded in May, which was facilitated by dry and warm weather. Low temperatures in April during the beginning of hatching of larvae restrained the growth of the number of phytophages and provoked the almost complete death of the woolly aphid population.