Karen from Va writes
The wooly aphids end up causing sooty mold on hackberry trees.
Fertilome Tree and Shrub Systemic Insect Drench is not labeled for hackberry trees. It should only be applied to outdoor trees and shrubs including listed fruit and nut trees: Apple, Loquat, Oriental Pear, Crabapple, Mayhaw Pear, Pecan, Quince. We recommend that you contact your local coopreative extension office to locate a product that will fit your needs.
Answer last updated on: 02/11/2018