why are the leaves falling off my plum tree?

Answer #1 · Maple Tree's Answer · Hi Peggy-There are several reasons that may be causing your plum tree to lose leaves. First inspect the leaves closely for any leaf damage or specs on the leaves that may be signs of insects. Is there any leaf discoloration (turning yellow or brown) or spotting of any kind on the leaves? Normally if the tree has been healthy and had no insect infestations the problem is most likely cultural and or environmental in nature. Inadequate water or nutrients can cause leaf drop. Has the tree been fertilized? Nutrient deficiencies such as a boron, iron, manganese, sulfur or nitrogen can cause leaf drop. You can consult your local nursery or garden center for a fertilizer formulated for fruit trees. Watering properly is important to prevent leaf drop. Trees should be watered in 6-8 inches down in the soil about two to three times a week through the fall. Organic mulch around the tree will help to keep soil moist during the hot summer months. Too much water can cause leaf drop. Too wet a soil can cause fungal disease and or root rot causing leaf drop. Have you had a lot of rain this year? I would first check the soil moisture. Dig down 6 to 8 inches in several spots around the root ball. The soil should feel cool and moist but never wet or dry. Has there been any insecticides or fungicides such as neem oil or insecticidal soaps sprayed on the tree or other plants in the area? These products used when temperatures are over 80 degrees F can cause leaf drop.

Let me know what you find when checking for any signs of insects and soil moisture.

John)