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 fruticosa the pun are "fructus" or "frux", from "fruor", "enjoy" - a fruit is a result enjoyed - and "frutex", "shrub", adjective "fruticosus", "bushy", from a totally different root. "Prunus" is a grammatical feminine, so "Prunus fruticosa" agrees in gender. However, Pallas says "Haec mihi tantum fructibus suis innotuit, qui distinctam itidem speciem indicare videntur", "It came to my attention at last because of its fruit, which repeatedly seemed to indicate a distinct species." The fruit seemed "fere Pruni forma", "nearly in the form of "Prunus"", especially because "praedita oblongo nucleo", "furnished with an oblong seed." So, Pallas moved it from