Mycelial growth of Pyricularia oryzae on amended potato-dextrose agar was inhibited to 50% of controls by ≥1250 ppm AH010 (40% benzalkonium chloride, 60% urea) and almost completely prevented by 10,000 ppm AH010. P. oryzae spore germination was completely inhibited by ≥18.6 ppm AH010 in sterile deionized water, and inhibition at 18.6 and 46.5 ppm AH010 was abolished by potato-dextrose broth. Sub-inhibitory concentrations of salicylic acid (SA; 50, 75, and 100 μM) negated the delaying effect of 9.3 ppm AH010 on spore germination. Maximal protection of perennial ryegrass plants from gray leaf spot disease (70–80% symptom reduction) was obtained with 2000 ppm foliar-applied AH010. Foliar-applied SA (2 mM) provided modest disease suppression that was dependent upon time of application and light regime. However, 2 mM SA antagonized disease suppression by AH010. Phytotoxicity of AH010 to L. perenne was observed, and this was conditioned by AH010 concentration and light regime.
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Vol. 67 • No. 2