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1 September 2006 Inhibition of Pyricularia oryzae, the Gray Leaf Spot Pathogen of Perennial Ryegrass (Lolium perenne), by AH010, a Novel Fungicidal Material
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Abstract

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.

Norman E. Strobel "Inhibition of Pyricularia oryzae, the Gray Leaf Spot Pathogen of Perennial Ryegrass (Lolium perenne), by AH010, a Novel Fungicidal Material," Journal of the Kentucky Academy of Science 67(2), 117-124, (1 September 2006). https://doi.org/10.3101/1098-7096(2006)67[117:IOPOTG]2.0.CO;2
Published: 1 September 2006
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