Q.Plum tree leaves
What is eating my plum tree’s leaves?
Plum Trees can have several pests and disease issues.
In the spring Plum Trees can be attacked by Tent Caterpillar and Gypsy Moth. Japanese Beetles can also attach the tree.
Inspect the tree and look for signs of these pests.
Here are some links with more information.
https://www.gardeningknowhow.com/plant-problems/pests/insects/tent-worms-control.htm
http://msue.anr.msu.edu/news/what_is_eating_my_leaves_spring_leaf_eaters_gardeners_should_know
https://www.gardeningknowhow.com/edible/fruits/plum/plum-tree-diseases.htm
https://www.gardeningknowhow.com/edible/fruits/plum/control-leaf-curl-plum-aphids.htm
https://www.gardeningknowhow.com/edible/fruits/fegen/fruit-tree-spraying.htm
https://www.gardeningknowhow.com/edible/fruits/plum/plum-curculio.htm