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Dibotryon morbosum is a fungus that affects the genus Prunus. Included in this genus are multiple species of trees and shrubs, such as: Dibotryon morbosum infects are Prunus serotina (wild cherry trees), Prunus persica (peach trees), Prunus domestica (plum trees), and Prunus cerasus (sour cherry trees). [3]
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 the spring and eventually 25,000 trees died by the end of the growing season. This was 10 percent of Pennsylvania's cherry tree acreage at the time. [22]
The disease is caused by the plant pathogens Leucostoma persoonii [2] and Leucostoma cinctum [3] and Cytospora leucostoma and Cytospora cincta [4] . The disease can have a variety of signs and symptoms depending on the part of the tree infected. One of the most lethal symptoms of the disease are the Leucostoma cankers.
Leaf spots can vary in size, shape, and color depending on the age and type of the cause or pathogen. Plants, shrubs and trees are weakened by the spots on the leaves as they reduce available foliar space for photosynthesis. Other forms of leaf spot diseases include leaf rust, downy mildew and blights. [4]
Monilinia laxa is an ascomycete fungus that is responsible for the brown rot blossom blight disease that infects many different types of stone fruit trees, such as apricots, cherries and peaches. [2] It can also occasionally affect some pome fruits; for example, apples and pears. [ 3 ]
It is one of the most common wood-rotting fungi for instance in urban North America. It is inedible. [3] The fungus has been identified as a cause of pulmonary infections in immuno-compromised humans. [4] Infested, of possible Irpex lacteus growth on a deceased section of a cherry tree.
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Taphrina padi, a 'tongue fungus', produces a distinctive, elongated, tongue-like growth on bird cherry, [3] similar to other closely related species such as Taphrina alni on ader (Alnus glutinosa) and Taphrina pruni on blackthorn (Prunus spinosa). [1] The growth is the distorted fruit and not the fungus itself. [4]