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Black knot occurs only on the woody parts of trees, primarily on twigs and branches, but can spread to larger limbs and even the trunk. Olive-green swellings from the disease are visible in the late spring; as it spreads and matures, typically by autumn, rough black knots circle and kill affected parts. The knots vary in diameter from one inch ...
Taphrina pruni is a fungal plant pathogen of blackthorn (Prunus spinosa) that causes the pocket or bladder plum gall, a chemically induced distortion of the fruit (sloes), producing swollen on one side, [1] otherwise deformed and flattened fruit gall without a stone. [2] The twigs on infected plants may also be deformed with small strap-shaped ...
5.3 Other fruit disease. 6 Prevention ... from the tree leaf litter of ... of Dibotryon morbosum which causes black knot disease in cherry, plum, and ...
A fungus in the genus Taphrina often attacks the plums; the young ovaries swell, often much larger than full grown plums, become hollow and often persist on the tree in winter. Known as "plum pockets", they appear pale green, leathery to the touch, and hollow with the exception of a few fibrous bands. The disease reduces regeneration of the plums.
Slime flux, also known as bacterial slime or bacterial wetwood, is a bacterial disease of certain trees, primarily elm, cottonwood, poplar, boxelder, ash, aspen, fruitless mulberry and oak. A wound to the bark, caused by pruning, insects, poor branch angles or natural cracks and splits, causes sap to ooze from the wound. Bacteria may infect ...
Inonotus obliquus causes a white heart rot to develop in the host tree. The chaga spores enter the tree through wounds, particularly poorly healed branch stubs. The white rot decay will spread throughout the heartwood of the host. During the infection cycle, penetration of the sapwood occurs only around the sterile exterior mycelium mass. [4]
The disease spreads most quickly during hot, wet weather and is dormant in the winter when temperatures drop. [citation needed] The pathogen spreads through the tree from the point of infection via the plant's vascular system, eventually reaching the roots and/or graft junction of the plant. Once the plant's roots are affected, the death of the ...
Leucostoma canker is a fungal disease that can kill stone fruit (Prunus spp.). [1] 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.