My Azaleas have yellowing leaves that appear as if the green has been partially scraped off with sandpaper. There are dark shiny spots on the undersides of the leaves. What is causing this to occur and how can I stop it?
|The yellowing on your Azaleas leaves is from the feeding activity of Azalea Lacebugs. The shiny black spots on the undersides of the leaves are excrement from these pests. Lacebugs are tiny insects with lacy clear wings that are often unnoticed because they feed on the underside surface of leaves.|
During the summer heat most lawn weed killers should be avoided to prevent injuring the grass. The herbicide Image is an exception to this general rule. Image can safely control a number of difficult weeds such as Dollarweed, Nutsedge, Bahiagrass, and Dandelions in Bermuda, Centipede, St. Augustine and Zoysia lawns. Bring us examples of the weeds that you would to like to control to see if they are labeled. Several of the weeds that Image can control will require repeat applications spaced 6 weeks apart.
The Crape Myrtle Aphid is causing the leaves to get a black coating. Crape Myrtle Aphids are small pale yellow insects that feed on plant sap. These insects secrete a sugary substance called honeydew as they feed. The black coating that you see is is called sooty mold. Sooty Mold forms on the honeydew secretion not directly on the leaves. To stop the problem you can kill the aphids with Insecticidal Soap, Ortho Systemic Insecticide, Hi- Yield Malathion or SunSpray Ultra-fine Oil.