Tan Spit

Tan Spit

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Nebraska IANR Nebraska Extension CropWatch Management Plant Diseases Wheat Tan Spot

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By Stephen Wegulo, Extension Plant Pathologist
Tan spot is caused by Pyrenophora tritici-repentis. The fungus can survive and reproduce on wheat straw. Early in the growing season, spores called ascospores are released from pseudothecia (tiny black, raised fruiting structures formed on wheat straw) and spread by wind or blowing rain. They are the primary source of infection of the lower, more mature leaves during tillering and early jointing. After the initial infection, the fungus spreads within a field or to neighboring fields by a different type of spore called a conidium that is produced in the tan spot lesions themselves.
Pseudothecia Tan spot symptoms usually appear in early April. On leaves, the disease first appears as small, tan to brown lens or diamond-shaped spots. Characteristic symptoms are elliptical to elongate spots that are tan colored, have a dark brown spot near the center and are surrounded by a yellow border. As the lesions increase in size they tend to coalesce, producing larger, irregular areas of dead tissue. When leaves are young and actively growing, the spots typically remain small. Where spots are abundant, leaves may yellow giving the field an overall yellow cast. The lower, more mature leaves are infected first and the pathogen spreads to the upper leaves as the disease progresses. As plants mature the fungus invades the straw where it produces pseudothecia in the fall. By mid-August, pseudothecia are visible on the stubble that remains after harvest and are diagnostic of tan spot. They feel like coarse sandpaper to the touch.
For additional information, see the UNL Extension NebGuide, Tan Spot Disease of Wheat (G429).
Pathogen, disease symptoms, favorable conditions, and management information.
Nebraska plant pathology specialists, their focus areas, and contact information:
Robert Harveson Phone: (308) 632-1239 rharveson2@unl.edu Focus: Dry bean, sugar beet, and sunflower
Tamra Jackson-Ziems Phone: (402) 472-2559 tjackson3@unl.edu Focus: Corn, sorghum and soybean
Stephen N. Wegulo Phone: (402) 472-8735 swegulo2@unl.edu Focus: Wheat
Dylan Mangel Phone: (402) 472-2559 dylan.mangel@unl.edu Focus: Soybean

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Wheat Doctor / Doctor Trigo by CIMMYT, Int. is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 2.5 Mexico License . Permissions beyond the scope of this license may be available at http://www.cimmyt.org .
Also known as yellow leaf spot, red smudge Pyrenophora tritici-repentis (Died.) Drechs. [teleomorph] Drechslera tritici-repentis (Died.) Shoemaker [anamorph]

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