Plum trees are easy to grow once a maintenance plan has been created. There are several varieties of plum trees available with some reaching a height and spread up to 20 feet. Plum trees are susceptible to several fungal infections and require spraying on an annual basis throughout the growing season. Pruning the tress annually assists with size control and makes spraying less labor intensive. General maintenance and care of the trees increases their health and prevents the introduction of disease.
Prune last season’s new growth by approximately 20 percent during the dormant season. Remove all broken and diseased branches.
Spray plum trees during the dormant period with dormant oil for trees. This will prevent aphid and mite egg production.
Spray trees in the spring with a fungicide to prevent brown rot as the blossoms begin to appear. Spray two to three times if the weather is rainy to make sure that the trees get a thorough application.
Spray organic neem oil or zinc sulfate on the tree if aphids are present on the tree in the spring.
Spray the trees with fixed copper at the time of leaf fall or before heavy rains begin. This will prevent shot hole fungus growth.