Diseases
Leaf spots of colonial bentgrass
Agrostis capillaris L.
A complex of fungal diseases of colonial bentgrass caused by species of Ascochyta, Bipolaris, Drechslera, Helminthosporium, and others. It manifests as small purple to brown spots that, if the condition progresses, can lead to yellowing and thinning of the stand.
In the reference 5 varieties crop Common bent, where this is mentioned in the description.
The pathogens causing leaf spots on colonial bentgrass include various genera, such as Ascochyta agrostidis, which is specific to this genus, as well as a wide range of fungi from the genera Bipolaris, Drechslera, Helminthosporium, Septoria, Leptosphaerulina, and Cercospora. These pathogens are often multifactorial in nature.
Symptoms of the disease are characterized by the appearance of purple to chocolate-brown spots on the leaf blades, which merge as they expand, often bleaching to a straw color in the center. The infection progresses from the leaf tips down to the sheath, and in necrotic tissues, fungal fruiting bodies may develop, visible as small yellow, brick-red, or black dots.
Under favorable conditions for the pathogens, such as high humidity and moderate temperatures, the disease can transition into a 'melting-out' stage, accompanied by massive yellowing and thinning of the turf. There is no information in current scientific sources regarding specific resistance genes to these pathogens in colonial bentgrass.
General information about the subject — on the page Leaf spot diseases.
Varieties of Common bent mentioned in the description
Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.
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