crepe myrtle black soot - Knowledgebase Question

vernon, Fl
Avatar for curlygrandm
Question by curlygrandm
April 5, 2009
Last year, black soot ruined my (3 yr old)crepemyrtle blooms. How do I stop it before it takes hold this year?

Answer from NGA
April 5, 2009
If the black substance is shiny and can be scraped off with a fingernail, it is sooty mold. This substance is the result of insect feeding higher up in the plant. As insects such as aphids feed, they exude a sticky substance called honeydew. There is just enough sugar content in the excretion to grow mold and the substance is then called sooty mold. Insecticidal soap is effective against aphids so once you get the aphid population under control you shouldn't have any more problems with sooty mold. If the black substance cannot be scraped off but in fact the leaves are turning black and falling off, it indicates over watering or overly soggy soils. Correct the water stress problems and your crape myrtle should rebound. Best wishes with your garden!

You must be signed in before you can post questions or answers. Click here to join!

« Return to the Garden Knowledgebase Homepage

Member Login:

( No account? Join now! )

Today's site banner is by RootedInDirt and is called "Red Blown Glass"

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.