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agrostis breviculmis/nécrose
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Identification and Pathogenicity of Bacteria Associated with Etiolation and Decline of Creeping Bentgrass Golf Course Putting Greens.
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Bacterial etiolation and decline has developed into a widespread issue with creeping bentgrass (CBG) (Agrostis stolonifera) putting green turf. The condition is characterized by an abnormal elongation of turfgrass stems and leaves that in rare cases progresses into a rapid and widespread necrosis
First Report of a Bacterial Disease on Creeping Bentgrass (Agrostis stolonifera) Caused by Acidovorax spp. in the United States.
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In June of 2009, a golf course putting green sample of creeping bentgrass (Agrostis stolonifera L.) cv. Penn G-2 from a golf club in North Carolina was submitted to the Michigan State University Turfgrass Disease Diagnostic Laboratory for diagnosis. The sample exhibited symptoms of general wilt,
First Report of Colletotrichum cereale Causing Anthracnose Foliar Blight of Creeping Bentgrass in Mississippi and Alabama.
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Colletotrichum cereale Manns, formerly C. graminicola (Ces.) G.W. Wils., is the causal agent of anthracnose foliar blight (AFB) of creeping bentgrass (Agrostis stolonifera L.) and other grass species (1). AFB is most prevalent on creeping bentgrass during summer heat stress (2). Symptoms of AFB
Identification of Waitea circinata as a Pathogen of the Moss Bryum argenteum var. argenteum on a Golf Course Fairway.
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Waitea circinata Warcup and Talbot (also referred to as W. circinata var. circinata) is an important fungal pathogen of amenity turfgrasses and is especially problematic on Poa annua in putting greens in the late spring or early summer. The pathogen was first identified in 2005 from Japan and has
First Report of Brown Ring Patch Caused by Waitea circinata var. circinata on Creeping Bentgrass in Arizona.
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A disease resembling brown ring (Waitea) patch was observed on a 'Dominant Extreme' creeping bentgrass (Agrostis stolonifera) green on a golf course in Maricopa County, Arizona in February 2010. The green was 17 months old and built with 95% sand and 5% peat moss. The superintendent reported seeing
First Report of Dollar Spot Caused by Sclerotinia homoeocarpa on Agrostis stolonifera in Argentina.
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During the summer of 2000, circular, yellow-to-brown, blighted, 2- to 4-cm-diameter patches were observed on creeping bentgrass (Agrostis stolonifera) putting greens (cv. Pennlinks) maintained at a 4- to 5-mm height on a golf course in Pilar (Buenos Aires, Argentina). Symptomatic leaves had
Phytotoxins from the leaves of Laggera decurrens.
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Upon biological screening of a series of African medicinal plants, substantial phytotoxic activity was found in the leaves of Laggera decurrens (Vahl.) Hepper & Wood (Asteraceae), using a Lemna minor bioassay. Bioassay-guided fractionation of the leaves led to the isolation of two physiologically
Identification of a New Waitea circinata Variety Causing Basal Leaf Blight of Seashore Paspalum.
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Seashore paspalum (Paspalum vaginatum) is a saline-tolerant, warm-season turfgrass species popular for golf course use in tropical and subtropical climates. A new variety of Waitea circinata (proposed as W. circinata var. prodigus) is described as the causal agent of basal leaf blight, a novel
Isolation of a phytotoxic isocoumarin from Diaporthe eres-infected Hedera helix (English ivy) and synthesis of its phytotoxic analogs.
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BACKGROUND
The fungus Diaporthe eres was isolated from a fungal pathogen-infected leaf of Hedera helix (English ivy) exhibiting necrosis. It is hypothesized that the causative fungus produces phytotoxins as evidenced by necrotic lesions on the leaves.
RESULTS
The fungus was isolated and grown in
Bermudagrass Dead Spot: A New Disease of Bermudagrass Caused by Ophiosphaerella agrostis.
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Hybrid bermudagrass (Cynodon dactylon (L.) Pers. × C. transvaalensis Burtt-Davy) is widely used on golf course putting greens in the southern United States. In March and April 1998, circular patches of dead grass 2 to 10 cm in diameter were observed on a bermudagrass putting green in College
Hepatic damage in sheep fed annual ryegrass, Lolium rigidum, parasitised by Anguina agrostis and Corynebacterium rathayi.
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Annual ryegrass (Lolium rigidum) parasitised by Anguina agrostis and Corynebacterium rathayi causes neurological signs and brain lesions thought to be associated with a vasoconstrictor effect of the toxic grass. In three separate experiments of six to 112 days duration parasitised ryegrass was fed
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