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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.
In regions of apple production where the year's weather is conducive to infection up to 70% of the pesticides applied are used to control for the effects of apple scab. [9] While the main host of economic interest are various apple cultivars the other host species are still affected by the pathogen.
Apple scab: Venturia inaequalis Spilocaea pomi ... Brown rot blossom blight and spur infection Monilinia laxa. ... Apple stem pitting = apple Spy 227 epinasty and decline
Common scab, a plant bacterial disease caused by Streptomyces species; Fusarium head blight, a fungal disease of plants, e.g., grain crops (especially wheat and oats), golf course grass, caused by the several species of Fusarium; Pear scab, a pear fungal disease caused by Venturia pirina or Fusicladium pyrorum
Strong growth within the root area dams up moisture and facilitates infection. [2] A prognostic model called Sooty Blotch RIMpro has been developed, which still awaits validation. Similar to the apple scab model it numerically grades risk and degree of infection and can serve as a warning system. It allows conventional growers to spray more ...
“Signs that scalp scabs may be related to an infection or underlying health condition include persistent itch, redness, pus, hair loss, or lack of response to over-the-counter treatments ...
In areas with a reduced risk of canker, it is recommended that a scab fungicide be applied in the spring-summer and copper oxychloride applied at leaf-fall to avoid infection. Although scab fungicides are commonly used for managing apple scab , cankers are also controlled when applied at the correct time. [ 5 ]
Scab infects leaves, fruit, and twigs in almonds causing dark spots to form. Scab lesions look greasy and oily. The major concern with almond scab is partial or complete defoliation of the tree. [9] As with leaf blight use of captan and ziram has been shown to reduce total incidence of almond scab infection. [6]