Dasineura tetensi Riibsaamen Black currant leaf midge

This midge is often a persistent pest of black currant. The larvae feed in the shelter of the young leaves. The infested leaves fail to develop properly and become crumpled and discoloured, affected tissue often turning black. Attacks are particularly significant on young bushes and cuttings. Adults are active from April onwards. Eggs are then deposited in small batches in the folds of the unfurling leaves, usually at the shoot tips. The translucent to whitish larvae feed gregariously for about 2 weeks and then drop to the ground to pupate in cocoons in the soil. New adults appear about 2 weeks later. There are normally three overlapping generations annually but sometimes a partial fourth.

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