Dasineura pyri Bouche Pear leaf midge

This pest occurs on pear, especially on young trees, where the larvae cause a distinctive longitudinal curling of the young leaves. The larvae, which are whitish and up to 2 mm long, feed gregariously on the upper epidermis, within the shelter of the tightly rolled leaf margins. Infested leaves are discoloured; they frequently turn red and, finally, black. There are usually three generations annually, and the pest tends to become more numerous later in the season. In dry summers, the number of generations may be restricted to two.

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