Abstract
Tan spot (<i>Pyrenophora tritici</i>-<i>repentis</i>) is one of the most important wheat diseases in Latvia. Significant spreading of this disease was observed from 1998. Field experiments were carried out at the Research and Training Farm "Peterlauki" of the Latvia University of Agriculture, during 1998-2003. Development of diseases was observed on 14 winter wheat varieties, dynamics of development was investigated on 'Donskaja polukarlikovaja' and 'Stava'. Assessments of the disease severity were carried out on the upper three leaves each week from the start of stem elongation to full ripening. Tan spot was observed at the stage of stem elongation in 2003, and only after flowering in 1999. Increase of the disease severity was slow until stage of milk ripeness, and only in late stages of wheat development sharp increase of the disease was observed. Total rate of infection (through the session of vegetation) was very slow (0,01-0,19), but during ripening rate achieved 0,5-0,6. The main reason of so unequal development of the disease seems changes in amount of infection sources. Other possible reason of rapid increase of the disease development is the relationship between leaf age and susceptibility to the disease. Further research is necessary for better understanding of tan spot life cycle.
Highlights
Tan spot, caused by Pyrenophora tritici repentis (Died.) Drechs., anamorph Drechslera tritici-repentis is one of the most important wheat diseases in the world, especially in the regions of intensive wheat growing, in Latvia from 1998 until present (Wo l f et al, 1998; Bankina, 2002)
Severity of tan spot fluctuated between varieties and years (Bankina, 2002)
Rate of infection was very slow until stage of milk ripeness (Tab.1), only in some cases it increased at the time of flowering
Summary
Tan spot, caused by Pyrenophora tritici repentis (Died.) Drechs., anamorph Drechslera tritici-repentis is one of the most important wheat diseases in the world, especially in the regions of intensive wheat growing, in Latvia from 1998 until present (Wo l f et al, 1998; Bankina , 2002). The rate of tan spot progression depends upon host, temporal and environmental components. Strong association between availability of moisture and infection. Association with other weather parameters was less evident (Wo l f et al, 1998). Changes in the epidemic of the disease are reflected by alterations in the disease progress curve. The most important parameters are rate of infection, shape of the curve and area under the disease progress curve (Campbell and Madden , 1990)
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