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Viral diseases; Apple chlorotic leafspot genus Trichovirus, ... Cherry rasp leaf virus (CRLV) Apple mosaic genus Ilarvirus, Apple mosaic virus (ApMV)
A. mali can still penetrate the stomates and hydathodes of leaves. [4] As with most pathogens, Alternaria mali resistance involves a gene-for-gene relationship. [4] Apple trees can recognize invading pathogens and mount a defense. [4] Often, the plant may be able to resist the pathogen, even though it has no genetic resistance to same.
Apple trees offer ample food resources for D. mali larvae, while the managed nature of orchards provides shelter and protection from natural predators and adverse environmental conditions. [10] The larval feeding gall inducing behaviour leads to the characteristic symptom of rolled or twisted leaves on apple trees. [13]
Apple trees are susceptible to many diseases, and because pruning involves leaving open wounds from branch cuts, it's best to do so when the trees are dormant, says Ferguson.
However, the most common host, the apple tree, tends to produce pale yellow irregular spots or bands along the major veins on the leaves as they expand in the spring. [1] The amount and severity of infected leaves with ApMV has a large dependence on temperature. Severe symptoms are pronounced during moderate spring temperatures.
On the apple tree, the infections occur on leaves, fruit and young twigs. [4] The brightly colored spots produced on the leaves make it easy to identify. Small, yellow-orange spots appear on the upper surfaces of the leaves, anytime from April to June. [5] These spots gradually enlarge and turn orange or red and may show concentric rings of color.
Apple chlorotic leafspot virus ... This virus reduces tree vigor (50% on pear), reduces yield (40% on pear), and causes quality reduction on fruits (if symptomatic).
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 ...
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