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  • 1 Agricultural Research Institute Kromeriz Havlickova 2787 Czech Republic
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The current study was focused on fungi colonizing the stem bases of wheat. Particularly, fungal species with significant harmful effect on wheat were studied. The dynamics of the stem base colonization by these fungi over the growing season were observed, and the association between individual pathogenic fungi was also evaluated. In addition, the fungal leaf sheaths penetration, which can cause physical disturbance, was assessed. The asymptomatic presence of fungal DNA in wheat tissue was confirmed. Microdochium nivale was found on the stem bases most frequently. Other fungi, such as Oculimacula spp., Rhizoctonia cerealis and Fusarium spp., were presented considerable less frequently. The statistical significant association was confirmed only between M. nivale var. nivale and M. nivale var. majus . Out of these, M. nivale tended to decrease in summer season, the frequency of occurrence of Oculimacula spp. and R. cerealis increased at later growth stages. Along with this, these species infected only plants previously colonized by M. nivale . Asignificant relationship between visual symptoms and presence of M. nivale DNA in the host tissue was confirmed.

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