Cultivar-specific differences in disease severity after ABA-treatment. Abscisic acid (20 μM) or mock-solution were sprayed onto seven-days-old primary leaves of barley cultivars Ingrid, Steptoe, Morex, Pallas, Golden Promise, Hannah and Sultan5. Inoculation with M. oryzae isolate TH6772 (200,000 conidia mL−1) took place one hour after treatment. Disease severity was evaluated six days after inoculation by counting blast lesions. Means and standard deviations of at least nine leaves per cultivar and treatment are shown. Significant differences between mock- and ABA-treatment were determined individually for each cultivar using t-test (p ≤ 0.05) and marked with an asterisk. The experiment was repeated twice with similar results.