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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.
Managing Resistance of Venturia inaequalis to the Strobilurin Fungicides ; Apple Scab, Plant Diagnostic Clinic, Cornell University ; Apple Scab, NYS IPM Tree Fruit Crops Fact Sheet Series (Revised), Wayne Wilcox ; Venturia inaequalis: Tom Volk's Fungus of the Month, September 2002 ; Apple and Pear Scab, Keepers Nursery
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 ...
Its ancestry includes the 'Rome Beauty', 'Melba', 'Golden Delicious' and 'Wealthy' apples, as well as the Malus floribunda crabapple for scab resistance. "PRI" is impressed in the cultivars name "PRI"ma. [2] 'Prima' was originally very resistant to apple scab due to having the Vf gene. However scab has since evolved around that resistance, and ...
A potentially deadly strain of fungus is spreading at "an alarming rate" and has shown resistance to multiple antifungal medications, the CDC warned. Deadly, drug-resistant fungus spreading at an ...
Malus floribunda, common name Japanese flowering crabapple, [1] [2] Japanese crab, [3] purple chokeberry, [2] or showy crabapple, [2] originates from Japan and East Asia. It may be a hybrid of M. toringo with M. baccata , in which case it would be written as Malus × floribunda .
Fungicide sprays applied in a timely manner are highly effective against the rust diseases during the apple cycle. [12] Most protective fungicide sprays are applied four times at 7- to 10-day intervals, starting with pink bud on crabapples. These applications are to protect the apples from spores being released from the cedar host in mid-spring.
Malus baccata is an Asian species of apple known by the common names Siberian crab apple, [2] Siberian crab, [3] Manchurian crab apple and Chinese crab apple. [4] [5] [6] It is native to many parts of Asia, but is also grown elsewhere as an ornamental tree and for rootstock.