While the Ferti-Lome Fruit Tree Spray with Neem Py should not cause any issues on a pruned tree, the product label indicates not to apply to plants under stress. Since pruning could stress the tree, you may want wait 2-3 days after prunging to spray.
Ferti-Lome Fruit Tree Spray with Neem Py is labeled to treat for grasshoppers. Please view the product label for full application instructions and information.
Ferti-Lome Fruit Tree Spray with Neem Py is not labeled for ants at all and there are no products currently labeled for leaf cutter ants as they are very difficult to control. We have some guides here that can help.