Evaluation of barley disease development depending on varieties
¹Institute of Soil and Plant Science, Latvia University of Agriculture, Liela 2, Jelgava, Latvia;e-mail: Biruta.Bankina@llu.lv
²Institute of Agrobiotechnology, Latvia University of Agriculture, Liela 2, Jelgava, Latvia;e-mail: Zinta.Gaile@llu.lv
Resistance against diseases is one of the key factors for plant varieties used in organic farming systems. Official variety trials in a certified organic field were inspected during 2004–2008 in the Research and Study farm “Vecauce”of LLU.Net blotch (caused by Pyrenophora teres) and mildew (caused by Blumeria graminis f.sp. hordei) were the most significant diseases in spring barley. Rust (caused by Puccinia hordei (syn. P. anomala) was observed very seldom and leaf scald (caused by Rhynchosporium secalis) was noted only in 2008 for a new breeding line, G 131.The incidence of net blotch fluctuated from 0–100% depending on year and variety, butthe incidence of mildew was 3–100%. The incidence of barley rust did not exceed 29% (severity only 0.7%).The obtained data gave general information about the spectrum of diseases, but they areinconsistent and are seriously influenced by meteorological conditions: artificial inoculation is necessary for better variety selection, especially for organic farming.