The symptoms are also called wheat yellow spot. The disease mainly damages the leaves and can form macular alone, sometimes mixed with other leaf spot diseases. The leaves were infected with a yellow-brown spot and later expanded to an elliptic to spindle-shaped large spot with a size of 7 to 301 to 6 (mm). The lesions were dark in the center and there were not obvious rounding lines. The borders were not obvious at the periphery. Yellow halos, late lesions fusion, causing leaves yellow and dry, all wheat areas occur, serious damage. The pathogen Drechslera tritici-repentis (Died) Shoesm called the dermatophyte of wheat, belonging to the fungus Aspergillus Suberii. Synonyms Helminthosporium tritici-vulgaris Nisikado. The sexual state is Pyrenophora tritici-repentis (Died) Drechsler. Ascospores are colorless to yellow-brown, long oval, with 3 diaphragms, 0 to 1 mediastinum, and sizes 42 to 6914 to 29 (μm). Non-sexual conidia pale to blight, cylindrical, straight or slightly curved, the top obtuse, the lower end was snakehead-shaped sharp, umbilicus cavity depression, with 1 to 9 off the diaphragm, size 80 ~ 25014 ~ 20 (μm). Transmission routes and disease conditions The more pathogens in the soil or manure along with the diseased bodies See the control method of wheat leaf spot root rot.
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