Efficacy of fungicide tebuconazole in barley varieties with different resistance level

Authors

• Pille Sooväli Jõgeva Plant Breeding Institute, Aamisepa 1, 48309 Jõgeva, Estonia; Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, 51014 Tartu, Estonia
• Mati Koppel Jõgeva Plant Breeding Institute, Aamisepa 1, 48309 Jõgeva, Estonia

DOI: https://doi.org/10.2137/145960610791015069

Keywords:

springbarley, net and spot blotch, tebuconazole, application time, yield, quality

Abstract

Efficacy of the fungicide tebuconazole was tested in 2 treatment regimes in 3 spring barley varieties over three years (20032005). The impact of the fungicide on the control of major barley pathogens Pyrenophora teres and Cochliobolus sativus, as well as kernel yield was studied in the course of field trials. The fungicide treatments had a strong impact on the control of infection of P. teres and increased kernel yield in variable disease infection conditions. For the more resistant genotype, fungicide application had relatively low returns because of the much higher level of biological resistance and small disease-related yield reductions. For the susceptible genotype, severe disease infection caused bigger yield reduction, not compensated by the use of fungicides. Use of fungicide demonstrated the highest economic return in the case of the moderately susceptible barley variety.;