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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.
Tree has good disease resistance to apple scab and powdery mildew. [6] The initiators of the PRI disease resistant apple breeding program have discovered that Malus floribunda has resistance to the apple scab and founded the program to introduce this VF gene into cultivated apples. Their work had been progressing with great success.
Apple scab: Venturia inaequalis Spilocaea pomi [anamorph] Apple ring rot and canker Botryosphaeria berengeriana = Physalospora. Armillaria root rot = shoestring root rot
Trunk injection or endotherapy also known as vegetative endotherapy, [1] [2] [3] is a method of target-precise application of pesticides, [4] [5] [6] plant resistance activators, [7] or fertilizers [8] into the xylem vascular tissue of a tree with the purpose of protecting the tree from pests, or to inject nutrients to correct for nutrient deficiencies.
A separate project was initiated by C.S. Crandall of the University of Illinois to breed scab-resistant apples by introducing the VF gene from the crabapple Malus floribunda. His work has been continued by the PRI disease resistant apple breeding program with great success. [5] Among the scab-resistant apples that carry the VF gene are ...
Gymnosporangium juniperi-virginianae is a plant pathogen that causes cedar-apple rust. [1] In virtually any location where apples or crabapples and eastern red cedar (Juniperus virginiana) coexist, cedar apple rust can be a destructive or disfiguring disease on both the apples and cedars.
Malus trilobata, the Lebanese wild apple, erect crab apple or three-lobed apple tree, is a species in the family Rosaceae in the genus Malus. [2] Some authorities place it in the segregate genus Eriolobus , as E. trilobatus .