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The pear slug is an important pest that eats leaves of cherry, pear, and plum trees, leaving behind a skeleton of veins. The larvae cover themselves in green slime, making themselves unpalatable to predators. The larva molt between five and eight times before being fully grown. [1]
Chondrostereum purpureum is a fungal plant pathogen which causes Silver leaf disease of trees. It attacks most species of the rose family Rosaceae, particularly the genus Prunus. The disease is progressive and often fatal. The common name is taken from the progressive silvering of leaves on affected branches.
Brachycaudus helichrysi overwinters as fertilised eggs which hatch during the winter or early spring, before the plum and damson trees on which they are laid come into leaf. The fundatrices (viviparous parthenogenetic females produced on the primary host) feed at first at the base of buds but as the buds begin to expand, they move on to softer ...
Prunus × cistena (purple leaf sand cherry), a hybrid of Prunus cerasifera and Prunus pumila, the sand cherry, also won the Award of Garden Merit. [16] [17] [18] These purple-foliage forms (often called 'purple-leaf plum'), also have dark purple fruit, which make an attractive, intensely coloured jam. They can have white or pink flowers.
Prunus americana, commonly called the American plum, [7] wild plum, or Marshall's large yellow sweet plum, is a species of Prunus native to North America from Saskatchewan and Idaho south to New Mexico and east to Québec, Maine and Florida. [8] Prunus americana has often been planted outside its native range and sometimes escapes cultivation. [9]
Cherry leaf spot has been present in the United States and mainland Europe since the 19th century. It has only become common and a problem in the United Kingdom since the 1990s. [21] The severity of the disease is very variable from year to year. In 1945 there was a serious outbreak in southern Pennsylvania. Trees began to defoliate early in ...
Prunus umbellata, called flatwoods plum, hog plum and sloe plum, is a plum species native to the United States from Virginia, south to Florida, and west to Texas. [3] [4] Prunus umbellata can reach 6.1 meters (20 feet) in height with a 4.6 m (15 ft) spread. It has alternate serrate green leaves that turn yellow in autumn. Flowers are white ...
Prunus subcordata is an erect deciduous shrub or small tree growing to 8 meters (26 feet) in height with a trunk diameter of up to 15 centimeters (6 inches). [2] It sprouts from its roots and can form dense, spiny thickets. The bark is gray with horizontal brown lenticels, similar in appearance to that of the cultivated cherry tree.