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THE STABILITY OF RESISTANCE TO ERGOT (CLAVICEPS PURPUREA /FR./TUL.) IN KENTUCKY BLUEGRASS IN DIFFERENT CONDITIONS

B. Cagas¹, W. J. Johnston² and J.W. Sitton²

¹OSEVA PRO s.r.o., Grassland Research Station, 756 54 Zubrí, Czech Republic

²Department of Crop and Soil Sciences, Washington State University

Pullman, WA, 99164-6420, USA

The degree of resistance to ergot (Claviceps purpurea /Fr./Tul.) was investigated in four Czech (Bohemia, Krasa, Moravanka, Slezanka) and four American (Coventry, Chateau, Midnight, Plush) Kentucky bluegrass varieties.  The study was performed under field conditions (natural and semi-artificial infection) at Pullman (USA) and Zubrí (Czech Republic), and in the glasshouse (Zubrí) with Czech and American ergot populations (artificial infection) in two years (1997 and 1998).  An exceptional stability of resistance under different conditions was observed in the variety Slezanka, whereas stable susceptibility was not found.

Keywords: ergot; kentucky bluegrass; stability of resistance.