Abstract
Development of tan spot epiphytosis in wheat and triticale has been investigated during three years of cropping seasons 1998-2001. The infection level of plants was scored in four stages of cereals development at the end of tillering (GS 29), shooting (GS 35-37), heading (GS 55-59) and milk maturity (GS 73-77). The monitoring performed on population of 327 wheat and 352 triticale genotypes indicated that the both cereals can be heavy infected by <i>P. tritici</i>-<i>repentis</i>, although the reaction of these hosts differed significantly. On triticale developed small, minute black spots usually without typical for wheat yellow halo. Moreover, the progress of tan spot of triticale over time was less rapid and disease intensity lower in the all plant growth stages during three years of studies.
Highlights
Tan spot beside Septoria complex is one of the most important, common and widespread leaf spot disease of cereals
The infection level of plants was scored in four stages of cereals development i.e. at the end of tillering (GS 29), shooting (GS 35-37), heading (GS 55-59) and milk maturity (GS 73-77) according to Tottman system of plant growth classification (To ttman, 1987)
In our studies the first disease symptoms on wheat and triticale were observed at tillering stage already in the fall
Summary
Tan spot beside Septoria complex is one of the most important, common and widespread leaf spot disease of cereals. The causing factor Pyrenophora tritici-repentis (Died.) Drechsler [anamorph Drechslera tritici-repentis (Died.) Shoemaker] was described on over 25 species from Gramineae family including wheat and triticale which are principal hosts among cereals (Krupinsky, 1992). For several years heavy outbreaks of tan spot has been reported mostly in USA, Brazil and Australia (Murray and Brown , 1987, Schilder, 1989), during the last decade the disease became more and more common in several countries of Europe (C o o k and Ya r h a m, 1989, Gindrat et al, 1988, Ve rreet , 1991). In the paper results of comparative analysis of tan spot epiphytosis in wheat and triticale are presented. Wojciech Wakuliñski, Czes3aw Zamorski, Ma3gorzata Schollenberger, Bogdan Nowicki and Piotr Kachlicki
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