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First Report of Cephalosporium gramineum, Causal Agent of Cephalosporium Stripe of Wheat, in a Commercial Winter Wheat Field in Virginia

First Report of Cephalosporium gramineum, Causal Agent of Cephalosporium Stripe of Wheat, in a Commercial Winter Wheat Field in Virginia

Plant Disease 91(3): 329

Cephalosporium stripe (CS) (2) was identified in a commercial field of winter wheat (Triticum aestivum) near Riner, Montgomery County, Virginia in May 2006. Nearly 15% of the field was severely affected. Broad, yellow-brown stripes were observed on the leaf blades of affected plants, and many plants were stunted and had ripened prematurely. Symptomatic plants were associated with low acidic (pH 5.2), wet spots of the field. Leaves and nodes of affected plants were surface disinfested for 1 min in 5% sodium hypochlorite, plated on corn meal agar (CMA), and incubated at 20°C for 5 days. Cephalosporium gramineum was isolated from numerous plants. Cultures of the fungus produced hyaline conidiophores approximately 5 μm long and unicellular conidia 3 to 7 μm long. Aqueous suspensions of mycelia and conidia were prepared from pure cultures. Several spring wheat cultivars were wounded by severing the root mass and were inoculated when the fifth stem node was detectable (35 on Zadoks scale). Noninoculated plants were wounded as controls. Plants were kept in the greenhouse at temperatures of 22 to 27°C. After 14 days, inoculated plants produced symptoms of CS, and the fungus was reisolated from the leaves of these plants. No symptoms were observed on noninoculated control plants. Though CS had been observed in Virginia in research nurseries (1), to our knowledge, this is the first confirmed report of the disease in a commercial wheat field in Virginia. References: (1) J. B. Jones et al. Plant Dis. 64:325, 1980. (2) C. M. Stiles and T. D. Murray. Phytopathology 86:177, 1996.

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Accession: 066510002

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PMID: 30780590

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