Contarinia pyrivora Riley Pear midge

This univoltine midge is a damaging pest of pear but tends to occur mainly on garden trees rather than in commercial orchards. Adult midges are active in the spring, when they deposit eggs in the open blossoms. The relatively large, up to 5 mm long, yellowish-white larvae feed gregariously within the developing fruitlets and become fully grown in about 6 weeks. They cause severe distortion; affected fruitlets also turn black and, on reaching approximately 15-20 mm in diameter, usually crack open and decay. Fully fed larvae overwinter in the soil, and adults emerge in the spring.

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