Resistance of spring barley cultivars to the new disease Ramularia leaf spot, caused by Ramularia collo-cygni
Lithuanian Institute of Agriculture, Instituto al. 1, Akademija,Kėdainiai distr., LT-58344, Lithuania; e-mail: alge@lzi.lt
Abstract:
In 2004 and 2005, the occurrence of Ramularia leaf spot was monitored at breeding nurseries of spring barley. Higher Ramularia severity developed in the dryer and sunnier year of 2005. Generally, resistance of cultivars to Ramularia leaf spot was similar between years. Half of the tested cultivars were more damaged by Ramularia in the second year. Average disease severity increased from 7.0% in 2004 to 13.4% in 2005. The correlation analysis showed no relationship between Ramularia and other diseases severities. The effect of Ramularia AUDPC on the yield in 2005 showed weak negative correlation (r = -0.37*). It can be explained by higher Ramularia and lower severities of other diseases. Among the tested cultivars there were identified genotypes with a high complex resistance to all foliar diseases. Such cultivars were Jersey, Philadelphia and Wikingett.
Key words:
Ramularia, resistance of cultivars, spring barley