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On leaf tissue, symptoms of blight are the initial appearance of lesions which rapidly engulf surrounding tissue. However, leaf spots may, in advanced stages, expand to kill entire areas of leaf tissue and thus exhibit blight symptoms. Blights are often named after their causative agent.
The tissue then turns soft due to pectolytic enzymes produced by the pathogen and the center of the lesion takes on a straw-color. Complete blighting can be seen about 12 days after initial infection. Symptoms towards the later stages also include leaf tip dieback and necrosis. These necrotic spots are the sites of secondary conidial production ...
Southern corn leaf blight (SCLB) is a fungal disease of maize caused by the plant pathogen Bipolaris maydis (also known as Cochliobolus heterostrophus in its teleomorph state). The fungus is an Ascomycete and can use conidia or ascospores to infect. [ 1 ]
Northern corn leaf blight (NCLB) or Turcicum leaf blight (TLB) is a foliar disease of corn caused by Exserohilum turcicum, the anamorph of the ascomycete Setosphaeria turcica. With its characteristic cigar-shaped lesions, this disease can cause significant yield loss in susceptible corn hybrids.
Often, plants that have wilt symptoms also have leaf blight symptoms. [citation needed] The second, more common phase of the disease is the leaf blight phase, which occurs on the leaves at any vegetative growth stage. [3] At first, the leaf lesions appear long and irregularly shaped and are light green to yellow and later on, straw colored.
Plant diseases caused by Botryotinia species appear primarily as blossom blights and fruit rots but also as leaf spots and bulb rots in the field and in stored products. The fungi induce host cell death resulting in progressive decay of infected plant tissue, whence they take nutrients.
Other forms of leaf spot diseases include leaf rust, downy mildew and blights. [4] Although leaf spot diseases can affect a small percentage of the host's leaves, more severe consequences of leaf spot disease results in moderate to complete loss of leaves.
Nutrient deficiencies can cause chlorosis and necrosis of leaf tissue which then in turn creates a wound necessary for disease inoculation. [ 1 ] Based on the amount of disease on the leaves, pruning the leaves may treat the disease, but one needs to decide if pruning the leaves is worth the nutrient deficiency that could follow depending on ...