Penelope Harris forwarded these photos of a friend’s cherry tree in Bakersfield, Vermont. She was curious: what had caused the gelatinous material seen on the tree?
Answer
The gelatinous substance is sap produced by the tree as a response to damage or injury. This response by the tree is known as gummosis and can be triggered by insects such as the cambium miner, fungal or bacterial cankers, or mechanical damage. Gummosis is common in many stone-fruit species. Here’s a more detailed look at the condition and possible culprits.
This week’s contest winner was Karen Sutherland