Abstract
Spot blotch of barley, caused by Bipolaris sorokiniana, has increased its intensity during the last growing seasons in Argentina. The in vitro inhibitory effect of different fungicide premixes on the mycelial radial growth of 10 B. sorokiniana isolates from different locations was assessed. Effective fungicide concentration that caused 50% inhibition of mycelial growth (EC50) was determined using a linear log analysis. The EC50 values varied from 0.05 to 0.37 µg mL−1 among fungicides. The lower EC50 values were obtained with premixes containing carboxamides. An additional in vivo experiment was performed to test the SB control when fluxapyroxad + pyraclostrobin + epoxiconazole was applied preventively or curatively. The fungicide significantly reduced the SB intensity (incidence, severity, number and size of lesions) when applied preventively. To our knowledge, this is the first report of sensitivity of B. sorokiniana and EC50 estimation to fungicides worldwide.
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