Fruit stem end and calyx infection by apple leafcurling midge

 Leafcurling midge adults lay their eggs on and among the very young unfolding leaves at the tips of the terminal shoots and other actively-growing shoots. The hatching larvae cause shoot distortion by rolling the edges of the young leaves, often rolling two young leaves together and preventing them from opening properly. The rolls remain on the leaves as they mature and early season damage can affect flower clusters, sometimes leading to fruit distortion. Leafcurling midge larvae and pupae can infect the calyx of fruit at harvest, where they spin cocoons.

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