Septoria tritici
Encyclopedia
Septoria tritici is the causal agent of S. tritici leaf blotch, a foliar disease of wheat
Wheat
Wheat is a cereal grain, originally from the Levant region of the Near East, but now cultivated worldwide. In 2007 world production of wheat was 607 million tons, making it the third most-produced cereal after maize and rice...

, and occasionally infects other grasses including barley
Barley
Barley is a major cereal grain, a member of the grass family. It serves as a major animal fodder, as a base malt for beer and certain distilled beverages, and as a component of various health foods...

. It is found in all wheat growing areas of the world
and is the major disease of wheat in the UK.

The teleomorph is Mycosphaerella graminicola
Mycosphaerella graminicola
Mycosphaerella graminicola is a wheat plant pathogen that is difficult to control due to resistance to multiple fungicides.-External links:* *...

(Fuckel) Schröter

Morphology

Asexual state: Pycnidiospores are hyaline and threadlike and measure 1.7-3.4 x 39-86 μm, with 3 to 7 indistinct septations. Germiniation of pycnidiospores can be lateral or terminal. Cirrhi are milky white to buff. Sometimes in culture nonseptate, hyaline microspores, measuring 1-1.3 x 5-9 μm, occur outside pycnidia by yeastlike budding.

Sexual state: Perithecia are subepidermal, globose, dark brown, and 68-114 μm in diameter. Asci measure 11-14 x 30-40 μm. Ascospores are hyaline, elliptical, and 2.5-4 x 9-16 μm, with two cells of unequal length.

Epidemiology

The period between infection and formation of sporulating structures (latent period) was estimated to be 20.35 ± 4.15 days for S. tritici and decreased with increasing temperature.

External references

The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
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