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Apple scab is a common disease of plants in the rose family that is caused by the ascomycete fungus Venturia inaequalis. [1] While this disease affects several plant genera, including Sorbus, Cotoneaster, and Pyrus, it is most commonly associated with the infection of Malus trees, including species of flowering crabapple, as well as cultivated apple.
2 Fungal diseases. 3 Nematodes, parasitic. 4 Viral diseases. 5 Viroid diseases. 6 Suspected viral- and viroid-like diseases. ... Viral diseases; Apple chlorotic leafspot
Additionally, pruning and disposing of galls from infected cedar trees would reduce sources of inoculum for infection of apple trees, however this would likely be time consuming and uneconomical. [6] For those doing bonsai, it is common to have the trees within feet of each other and on the central eastern seaboard of the United States, eastern ...
The infection cycle begins in the springtime, when suitable temperatures and moisture promote the release of V. inaequalis ascospores. These spores rise into the air and land on the surface of a susceptible tree, where they germinate and form a germ tube that can directly penetrate the plant's waxy cuticle.
Apple scab is spread through fungus growing in old apple leaves on the ground and spreads during warm spring weather to infect the new year's growth. [61] Among the most serious disease problems is a bacterial disease called fireblight, and three fungal diseases: Gymnosporangium rust, black spot, [62] and bitter rot. [63]
Age factors into P. expansum infection, in that overripe or mature fruits are most susceptible to infection, while those picked underripe are less likely to become infected. In apples, the colors of the lesions may vary with variety, from lighter-brown on green and yellow apple varieties to dark-brown on the deeper-red and other darker-color ...
Trimming away dead or diseased branches improves air circulation, minimizes the risk of fungal diseases, and boosts yield. Ahead, experts explain how to prune a fig tree to ensure it stays healthy ...
Rosellinia necatrix is a fungal plant pathogen infecting several hosts including apples, apricots, avocados, cassava, strawberries, pears, hop. citruses and Narcissus , [ 1 ] causing white root rot. References