Weeping Mulberry Trees
Q.

Weeping mulberry tree

Zone Lee's Summit Mo 64081 | Vanxbebb added on August 31, 2016 | Answered

My weeping willow, which is approximately 40 years old, has developed some brown sap looking places on the bark, plus it seems to be dripping the sap. Can you tell me what this could be and how do I stop it? Pat VanBebber

A.
A.Answers to this queston: Add Answer
Alisma
Certified GKH Gardening Expert
Answered on August 31, 2016

The most common cause of dripping willow trees is an insect infestation. Most likely, the dripping substance is actually honeydew, the waste of aphids and scale insects that consume sap. Both commonly infest willows. In this case, you will probably be able to see the insects themselves, though they are tiny:

https://www.gardeningknowhow.com/plant-problems/pests/insects/aphids-tree-disease.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/control-plant-scale.htm

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