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Viral diseases; Apple chlorotic leafspot genus Trichovirus, Apple chlorotic leafspot virus (ACLSV) Apple dwarf (Malus platycarpa)
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.
Pages in category "Apple tree diseases" The following 47 pages are in this category, out of 47 total. This list may not reflect recent changes. * List of apple ...
Planting of less susceptible apple cultivars, horticultural practices that promote tree health and reduce fruit wetness hours, removal of overwintering diseased twigs and fruit, and fungicides Bitter rot of apple is a fungal disease of apple fruit that is caused by several species in the Colletotrichum acutatum and Colletotrichum ...
The second reason is if the apple tree has a disease, like fire blight. If your tree has this problem, consult a professional certified arborist to help diagnose the disease and recommend treatment.
A study by Hunter et al. 1959 was conducted, where buds from virus infected trees were grafted onto healthy trees. The healthy trees with the buds were then incubated at 37 °C for 28, 30, 36 and 40 days. A year following the incubation, there were no symptoms present on the healthy tree other than from the buds. [10]
The disease is favoured by temperatures between 77 and 86 °F (25–30 °C), and by wet conditions. [1] Infection occurs at optimum temperatures with 5.5 hours of wetting, [2] and an outbreak can become serious within two days of infection. The fungus attacks susceptible cultivars using a chemical toxin. [1]
Apple rubbery wood virus, also known as apple rubodvirus is a viral disease that causes apple rubbery wood in apple and pear cultivars. There are two varieties: ARWV 1 and ARWV 2. It gets its name from its distinctive effect that it has on its host trees, which show unusual flexibility in the stems and branches after a few years of infection.