Aphids will suck the tree's sap and damage the leaves, aided by ants who are all too happy to see your tree's aphid population — and the resulting supply of honeydew — boom. If this sounds familiar, ...

Garden columnist Dan Gill answers readers' questions each week. To send a question, email Gill at gnogardening@agcenter.lsu.edu. My problem is with black stuff on my crape myrtles' leaves and bark. It ...