Plant two different European plums or two different Japanese plums in a landscape to ensure a crop. Good care practices will help reduce pests and diseases. Two major pests of plum trees are the peach tree borer and the pear slug. Peach tree borers attack the lower part of the trunk. They can be controlled with pesticides applied to the lower trunk during the first part of July.
Pear slugs are the larvae of sawflies.
They suck juices from leaves, leaving only a skeleton. Dusting leaves with wood ashes will kill the larvae. These Insects can also be controlled with almost any general purpose insecticide. Permission is hereby given to duplicate this Plant talk Colorado TM script as is if credit is given to the sources.