Elm trees usually produce sap from cuts and wounds on the tree. Sap production is also commonly initiated by bacterial infections causing sap to ooze from the openings. 

Sap Production From Elm Tree

Sap is important for nutrient circulation in trees, and some plants produce more than others, like sugar maples which are harvested for maple syrup. Elm trees can also produce excess sap due to bacterial wetwood, which can weaken the tree. Contact a tree care professional for help and look out for signs.

Elm Tree Types' Sap Production

American Elm or White Elm

This is one of the most common types of elms. It is usually identifiable by its unique height of about 90 feet. They have a vase-shaped spread of about 75 feet. It is found in Eastern North America in the USDA growing zones 2 to 9. Sap-sucking insects usually leave a residue of "honeydew sap" on the leaves and stem of the American elm.

Chinese Elm

The Chinese elm is highly adaptable to different conditions. It has the same vase shape as the American elm. It is well-rounded and has a dark grey bark shade, making it more unique. It can be found in areas like Japan, China, and North Korea. It is about 50 feet tall. The Chinese elm is adaptable to different types of well-drained soil. It also drips sap as a result of cuts or bacterial infections. 

Slippery Elm

This elm is medium size, unlike its counterparts. It also has a vase shape but is also broad and rounded. The name comes from the slick and slimy secretion in the tree's inner bark.  It is susceptible to Dutch elm disease caused by elm bark beetles. The beetles can easily get attached to the slippery bark of the elm.

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