Cherry black fly

Symptoms

During late spring and early summer, the undersides of the leaves and the shoot tips are covered with shiny black aphids. The leaves become crumpled and curled. Later in the summer the damaged leaves dry up and turn brown. The infestation gradually dies out during July but damaged leaves remain visible for the rest of the summer.

Spot them

Cherry black flies are slightly smaller than the common house fly and have wings marked with distinctive black bands.