Q.the leaves on my plum tree are curling
The leaves on my plum tree are curling and tiny little holes in them. Killed 2 tiny black insects. Don’t know what plum tree it is and pruned when I planted. Was given tree because it did not yield but quite a nice little crop on now.
One possibility is leaf curl plum aphids: https://www.gardeningknowhow.com/edible/fruits/plum/control-leaf-curl-plum-aphids.htm
However, there are also a number of fungal and bacterial infections that can cause leaf curl or little holes. If you take some samples of leaves and branches to the local Extension Service, they should be able to diagnose and prescribe treatment. This link will help you locate one: https://www.gardeningknowhow.com/extension-search/