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A leaf spot is a limited, discoloured, diseased area of a leaf that is caused by fungal, bacterial or viral plant diseases, or by injuries from nematodes, insects, environmental factors, toxicity or herbicides.
Gray leaf spot (GLS) is a foliar fungal disease that affects grasses. In grasses other than maize it is caused by Pyricularia grisea , which only infects perennial ryegrass , tall fescue , and St. Augustine grass in places with warm and rainy climates.
These spots eventually appear on the leaf sheaths. The fungus then begin to move down and invade the crowns and the roots of the plants. From far away, the turf appears yellow or blackish brown. The colors that appear on the turf directly reflect the nitrogen levels in the plant. When turfgrass has low levels of nitrogen it turns yellow and ...
The disease cycle starts with fungi overwintering in leaf and plant clippings/debris of infected grass plants. Spores are produced and can be dispersed through wind and rain splash, machines, and many other mechanisms, although clippings and debris are the main source of the inoculum. [3]
Ascochyta sorghi infects grain crops such as sorghum (Sorghum bicolor), Johnson grass (Sorghum halepense), Sudan grass (Sorghum sudanense), and barley (Hordeum vulgare). [1] It can also infect wild sorghum species. [2] Symptoms of rough leaf spot can appear on leaf blades, leaf sheaths, peduncles, stalks, and glumes of susceptible species. [2]
Dollar spot is a fungal disease of turfgrass caused by the four species in the genus Clarireedia, in the family Rutstroemiaceae. [1] The pathogen blights leaf tissues but does not affect turf grass roots or crowns.
The purpose of disease management is to prevent the amount of secondary disease cycles as well as to protect leaf area from damage prior to grain formation. Corn grey leaf spot is an important disease of corn production in the United States, economically significant throughout the Midwest and Mid-Atlantic regions.
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 ...
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