Hello,

The leaking of white sap from the trunk of a peach tree is commonly referred to as gummosis. This condition can be caused by biotic (living) and abiotic (nonliving) factors. Here are some potential causes:

Insect Damage: Borer insects, such as the Peach Tree Borer and the Lesser Peach Tree Borer, can bore into the trunk and branches, causing sap to ooze out. More information at these links:

Peach Gummosis - UF/IFAS Extension Lake County (ufl.edu)

Peach Tree Gummosis | Forestry | Extension | USU

Water Damage: Overwatering or improper irrigation that allows water to accumulate on the trunk can lead to gummosis. More information at this link:

Peach Gummosis - UF/IFAS Extension Lake County (ufl.edu)

Chemical Injury: Using herbicides like glyphosate (commonly found in Roundup) can be absorbed through the thin bark and exacerbate the problem. More information at this link:

Peach Gummosis - UF/IFAS Extension Lake County (ufl.edu)

Physical Damage: Mechanical injuries to the tree, including those from wind or physical impact, can cause gummosis. More information at these links:

Peach Gummosis - UF/IFAS Extension Lake County (ufl.edu)

Peach Tree Gummosis | Forestry | Extension | USU

Fungal Infections: Fungi like Botryosphaeria can infect the tree through wounds or lenticels, leading to cankers that ooze sap. More information at this link:

Peach Gummosis - UF/IFAS Extension Lake County (ufl.edu)

Management of gummosis involves reducing stress on the tree, practicing good sanitation, and avoiding damage from the abovementioned factors. It’s also recommended that affected areas be pruned and pruning tools sanitized to prevent the spread of disease. Fungicide applications may help suppress fungal infections in young trees. More information at this link:

Peach Gummosis - UF/IFAS Extension Lake County (ufl.edu)

For a confirmed and precise identification of the problem, I recommend you send all your images by e-mail to the MSU Plant & Pest Diagnostics Lab. The experts there can also provide you with the best treatment options. Their email is <personal data hidden>. Please include your name. The lab will let you know if they need a sample sent. FYI, the lab may also ask for additional images.

Their website is at this link:

Plant & Pest Diagnostics (msu.edu)

Their Contact Information is at this link:

Contact Us - Plant & Pest Diagnostics (msu.edu)

This link will explain the details of submitting a sample to MSU Plant & Pest Diagnostics Lab:

Submit Samples - Plant & Pest Diagnostics (msu.edu) 

I hope this helps