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Mycosphaerella musicola was first reported from Java in 1902 and by 1962 was found in most banana growing regions of the world. Although it is spread over short distances by conidia and ascospores, over long distances it is the movement of infected germplasm such as diseased leaves and suckers that is likely to be responsible.
Laminated root rot also known as yellow ring rot is caused by the fungal pathogen Phellinus weirii. Laminated root rot is one of the most damaging root disease amongst conifers in northwestern America and true firs , Douglas fir , Mountain hemlock , and Western hemlock are highly susceptible to infection with P. weirii .
It has been shown that the fungus usually requires wounds to infect the plant and necessary for the fungus to develop. The first symptoms of Pestalotiopsis palmarum begin as very small yellow, brown or black discoloration of the leaves. The disease can be restricted to the leaf blade or may only appear on the petiole and rachis right away.
Symptoms can overlap across causal agents, however differing signs and symptoms of certain pathogens can lead to the diagnosis of the type of leaf spot disease. Prolonged wet and humid conditions promote leaf spot disease and most pathogens are spread by wind, splashing rain or irrigation that carry the disease to other leaves.
Macadamia shoots showing zinc deficiency symptoms. The youngest leaves show chlorosis (yellowing), dwarfing and malformation. Visible deficiency symptoms include: [3] Chlorosis - yellowing of leaves; often interveinal; in some species, young leaves are the most affected, [4] but in others both old and new leaves are chlorotic; [3] [5]
The pathogen causes a disease originally named yellow spot but now commonly called tan spot, yellow leaf spot, yellow leaf blotch or helminthosporiosis. [2] [3] At least eight races of the pathogen are known to occur based on their virulence on a wheat differential set. [4] The tan (yellow) spot fungus was first described by Nisikado in 1923 in ...
Didymascella thujina occurs on western red cedar (T. plicata) and T. plicata var. atrovirens on the west coast of North America, where it is a significant leaf blight. It also occurs in eastern white cedar (T. occidentalis) in eastern North America, although its effect is insignificant. [7]
Blister is the any several disease caused by leaf curl fungi of genus . It thrives in tea growing regions of Asia with elevations over 700 m and high relative humidity. E. vexans prefers to attack the young leaves on the lower half of hosts and presents as small yellow translucent leaf spots which progress to lesions. These lesions give the ...
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