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U.S. Plant Patent 7197 and Report 225-1992 (AD-MR-5877-B) from the Horticultural Research Center indicated that the Honeycrisp was a hybrid of the apple cultivars 'Macoun' and 'Honeygold'. [1] However, genetic fingerprinting conducted by a group of researchers in 2004, which included those who were attributed on the US plant patent, determined ...
Viral diseases; Apple chlorotic leafspot genus Trichovirus, Apple chlorotic leafspot virus (ACLSV) Apple dwarf (Malus platycarpa)
Bitter rot of apple is a fungal disease of apple fruit that is caused by several species in the Colletotrichum acutatum and Colletotrichum gloeosporioides species complexes. [1] It is identified by sunken circular lesions with conical intrusions into the apple flesh that appear V-shaped when the apple is cut in half through the center of the ...
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.
Bitter pit in the 'Summerred' cultivar Signs of bitter pit beginning on one apple, lower left. Bitter pit is a disorder in apple fruits, now believed to be induced by calcium deficiency. It occurs less commonly in pears. The disease was probably first reported in Germany where it was known as Stippen. [1]
The MN55 cultivar apple developed by David Bedford, a senior researcher and research pomologist at the University of Minnesota's apple-breeding program, and James Luby, PhD, professor, Department of Horticultural Sciences, Horticultural Research Center, is a cross between Honeycrisp and MonArk (AA44), a non-patented apple variety grown in Arkansas.
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.
Phacidiopycnis washingtonensis, is a species of fungus in the family Phacidiaceae, first described by C.L. Xiao & J.D. Rogers in 2005. [1] It is a weak orchard pathogen and a cause of rubbery rot, also known as speck rot, in postharvest apples.