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Rabbits and rodents can cause injury to the thin bark and twigs of young trees.
Rhytisma acerinum is a plant pathogen that commonly affects sycamores and maples in late summer and autumn, causing tar spot. Tar spot does not usually have an adverse effect on the trees' long-term health. [1] R. acerinum is an Ascomycete fungus that locally infects the leaves of trees and is a biotrophic parasite. [2]
Pruning and treatment dots also give a heads-up to property owners near the trees. This way, when the city notifies them of an upcoming pruning or treatment, they know which trees will be affected.
Haematomma accolens, commonly known as the tree bloodspot, is a species of crustose lichen in the family Haematommataceae. [5] It forms thin to moderately thick patches on tree bark, appearing yellowish-white to greenish-grey in colour, and features vivid red to deep reddish-orange spore-producing structures ().
An early sign is what looks like a bleeding spot on the tree. A reddish-brown fluid will ooze from the wound site, giving it this appearance. Later, perithecia will form around the dead spot, which is another sign of the disease. [1] [2] Symptoms of beech bark disease can be observed in the foliage and on the bole of the tree. Foliage may ...
Aleurodiscus oakesii on white oak bark, found in Illinois, US. Aleurodiscus oakesii is a cluster of small, gray-white, irregular cup-shaped saprotrophic fungi that grows on decaying hardwood tree bark. This fungus may also be called hophornbeam discs, [1] and it causes smooth patch disease.
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 ...
In addition some species of birds are considered pests by Christmas tree farmers, examples include the pine grosbeak (Pinicola enucleator) and the yellow-bellied sapsucker (Sphrapicus varius). [16] The pine grosbeak feeds on buds on conifers, including Christmas trees, which stunts tree growth, causes abnormal formation, and thins the foliage.