Ask Alys: what are the white larvae on my cherry tree? | Alys Fowler

Our gardening expert has the answerLast summer, the fruit from my cherry tree had pinpricks and I found tiny white larvae in some of the cherries, even though I had treated the tree with a spray. What shall I do?I think you may have the spotted winged drosophila (SWD) fruit fly, which looks like a common fruit fly, except the adult male has a distinct spot on each wing. While the common fruit fly is harmless to fruit with undamaged skin, female SWDs pierce the skin of cherrie