Unfortunately, treatment for bacterial canker is disappointingly inconsistent and ineffective.

Sep 21, Plum trees drop fruit naturally in two major cycles. The first drop happens in spring when the tree sheds infertile plums over a two- or three-week period after blooming. The second drop happens in midsummer.

Not all plum varieties exhibit this June drop, which most commonly affects the Italian prune plum. Jun 27, Extreme cold during flowering will cause the blooms to drop too early, and a plum tree fails to bear fruit.

Freezing temperatures before blooms open will also kill the flowers. Without flowers, you will have no fruit. Insects that chew the terminal ends, shoots and flowers will also cause no fruit on plum trees.

A plum tree’s growth cycle undergoes a period of dormancy during cold weather conditions. Extreme cold weather during flowering will make the blossoms drop too early, and the plum tree fails to bear fruit. Insects which chew the flowers, shoots, and terminal ends also cause no fruit on the plum trees.

Problems with Plum Tree Flowering and Fruiting. Plum trees can fail to bloom or form fruit for any of the following reasons: Insufficient chill –hours, Lack of pollinator tree nearby, Insects and disease, Incorrect pruning and fertilizing.

Chill Hours: Each variety has its own requirement for hours below 45ºF (7ºC), known as bushdig.barted Reading Time: 3 mins. Jun 22, If the blossoms, fruit, and/or twigs and branches of your plum tree are covered with a dark brown slime, it is probably infected with the fungus known as brown rot (Monilinia fructicola). Brown rot will cause the plums to become soft and shriveled, and eventually drop off the tree.

This plum should have been pruned in early summer to reduce the effects of alternate bearing.

Remove and destroy infected fruit in late summer or fall. Feb 27, It can cause leaf drop and a reduced plum yield, but it is unlikely to kill the tree. Plum trees are usually impacted at the end of the growing season, making it more resistant to the mal effects of the fungus. Source and Treatment of Plum Rust. The spores spread easily on the wind, but the fugus can be treated with fungicides.

Rotate your chemicals to manage any resistant fungi.

NEEM oil is a natural infection control medium that smothers insects and spores alike.

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Plum trees are normally relatively sappy trees, so a little sap leaking from plum trees may not be reason for alarm. However, if you notice your plum tree is bleeding sap, your tree may have a bushdig.bar