Perhaps your problem is one of the most common, the plum curculio, a weevil.
From the chron.com
The fruits of many of these are not cherries, and have other common names, including plum, apricot, peach, and others.
From the en.wikipedia.org
Your plum tree probably has shot hole, also called coryneum blight, which was common on flowering plum trees after last year's long, wet spring.
From the sacbee.com
Some mounds support persimmon, not common in the Delta swamps, and Mexican plum, not all that common anywhere, but certainly not in cypress swamps.
From the al.com
This year the union fought for another breakthrough that would tie pension benefits to the cost of living, a plum common to public employees but still almost unknown in the private sector.
From the time.com
Dessert gooseberries, which are pink, are less common but can be eaten as one would a grape or plum.
From the themercury.com.au
There are many varieties of plum with as many different origins, but the European plum, which is the most common today, dates back 2,000 years.
From the orlandosentinel.com
While this is a fairly common French dish, Solomko pulls it off perfectly, blending the plum, citrus and savory duck flavors into something intoxicating.
From the pe.com
Many common deciduous fruit trees, including apple, crabapple, plum, peach, and cherry, are in the rose family and all are susceptible to powdery mildew where sunlight is not plentifully available.