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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.
Hard spot lesions on an orange host. Hard spots are the most common lesions. They are small, round, and sunken. The average diameter of hard spot lesions ranges from 3–10 mm (.12-.4 in). [13] [14] They have dark red to chocolate brown margins and often have pycnidia in the gray-colored centers. [15] A green halo may be present around the ...
Theses leaf spots are an orange-brown rust in color and usually occur entirely on the upper leaf surface, although leaf spots on the undersides of infected leaves have been reported. The spots are fuzzy in texture and approximately 2 cm (0.8 in) in diameter. [2] In some cases, commonly in more susceptible hosts, stem and fruit spots can occur ...
Cedar-apple rust disease, for example, can persist despite removal of one of the hosts since spores can be disseminated from long distances. The severity of cedar-apple rust disease can be managed by removal of basidiospore producing galls from junipers or the application of protective fungicides to junipers. [24]
Apple flat apple genus Nepovirus, Cherry rasp leaf virus (CRLV) Apple mosaic genus Ilarvirus, Apple mosaic virus (ApMV) genus Ilarvirus, Tulare apple mosaic virus (TAMV) Apple stem grooving = Apple decline of Virginia crab genus Capillovirus, Apple stem grooving virus (ASGV) Apple stem pitting = apple Spy 227 epinasty and decline
5. Low Humidity. Light brown spots scattered across fiddle leaf fig leaves can be caused by dry air. If the brown spots in question have a pox-like look instead of being in a single area of the ...
Greasy spot and greasy spot rind blotch Mycosphaerella citri Stenella citri-grisea [anamorph] Green mold Penicillium digitatum: Heart rot Ganoderma applanatum Ganoderma brownii Ganoderma lucidum and other basidiomycetes Hendersonula branch wilt Hendersonula toruloidea: Leaf spot Mycosphaerella horii Mycosphaerella lageniformis. Mal secco Phoma ...
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