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honey locust diseased? #757344
Asked June 20, 2021, 7:20 PM EDT
Arapahoe County Colorado
Expert Response
Thank you for your question.
The granular substance you describe is probably honeydew, a sugary liquid secreted by aphids and some other bugs. It will attract ants and other insects. Usually this is a temporary problem but with big infestations it can be a nuisance.
There are several insects that can cause problems for honey locust trees. Here is a Fact Sheet specifically about these insects:
https://extension.colostate.edu/topic-areas/insects/insect-and-mite-pests-of-honeylocust-5-571/
Additionally, look for aphids on the leaves and twigs. Aphids also secrete honeydew. They can cause curling of the leaves as well. Here is a Fact Sheet on aphids:
https://extension.colostate.edu/topic-areas/insects/aphids-on-shade-trees-and-ornamentals-5-511/
I hope you will find this information helpful.