Taphrina pruni being larger than the healthy one. As a fungus, cool and wet weather conditions promote the germination of spores, whilst warm and dry weather results in infection rarely taking place. Colonisation can become extensive and eradication very difficult. The disease can to some degree be controlled by carefully removing infected branches, witch's brooms and fruit before the infective air borne spores are produced. Applications of copper-containing fungicides have a degree of control over the fungus. Taphrina pruni Taphrina pruni is a fungal plant pathogen of blackthorn (Prunus spinosa) that causes the Pocket or bladder Plum gall, a chemically induced distortion
Prunus alleghaniensis bark is fissured in older specimens. The flowers are plentiful and white, eventually turning pink. The dark reddish purple fruit is half an inch (13 mm) wide, with a whitish bloom. "Prunus alleghaniensis" is not common in moist woodlands. It is typically found in elevations between . Prunus alleghaniensis Prunus alleghaniensis, the Allegheny plum, is a species of New World plum, native to the Appalachian Mountains from New York to Kentucky and North Carolina, plus the Lower Peninsula of Michigan. There are old reports of it growing also in New Jersey and Connecticut, but it now appears to have been