Сельскохозяйственная биология, 2011, № 3, с. 98-101.

УДК 631.46:579.64:582.288.45:582.14

STUDY OF Fusarium culmorum DEVELOPMENT IN SOIL FOR SEARCH OF PROTECTIVE ACTIONS AGAINST BARLEY ROOT ROT

O.K. Strunnikova

Fusarium culmorum macroconidia were introduced into soil on surface of the membrane filters. Immunofluorescent staining was used for identification of fungus structures on the filters and on barley roots. Fungus development was evaluated under different soil conditions leading to different disease incidence. The relation between formation of particular structures by fungus and its pathogenic activity was not established. It was shown that soil bacteria are the natural antagonists of F. culmorum. Population of F. culmorum soil and intensity of root rot decreased in soil with high native microbial activity and in soil with introduced strain of antagonist bacterium. On the contrary, cellulose introduced into soil has led to increase of fungus soil population but disease intensity decreased. Soil amendments with cellulose may be the way which will promote transition facultative phytopathogen F. culmorum to saprotrophism.

Keywords: growth of Fusarium culmorum in soil, soil conditions, population density, root rot.