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Palmer, C. L., Bonde, M. R., Nester, S. E., Revell, J. M., and Luster, D. G. 2014. Fungicide impact on in vitro germination of basidiospores of Puccinia horiana, the causal agent of chrysanthemum white rust. Plant Health Progress doi:10.1094/PHP-RS-14-0032. Puccinia horiana is an actionable pathogen that, upon diagnosis, triggers an eradication protocol combining destruction of symptomatic chrysanthemums and a strict fungicide regime for asymptomatic plants. Symptoms typically appear during the fall as growers prepare to ship their crops. To expand the list of effective fungicides and develop fungicide sensitivity baselines, we screened in vitro germination of P. horiana basidiospores in 0.05% water agar solution amended with varying concentrations of 14 fungicides: azoxystrobin, boscalid + pyraclostrobin, fluoxastrobin, mancozeb, mandestrobin, metconazole, myclobutanil, propiconazole, tebuconazole, triadimefon, trifloxystrobin, trifloxystrobin + triadimefon, and triticonazole. Leaves with pustules ready to sporulate were affixed to petri plate lids over bases containing fungicide-amended agar. After 2 days in the dark, percent basidiospore germination was assessed. Concentrations required for 50% germination (EC50) grouped according to fungicide mode of action. Benzimidazoles exhibited EC50 values ranging from 9 to 244 ppm, while strobilurins ranged from 2 to 27 ppb. Mancozeb exhibited an EC50 of 7 ppm, and chlorothalonil was 205 ppb. Combinations of strobilurins with other modes of action exhibited EC50 values in the same range as the strobilurins. These data provide a baseline for monitoring resistance development to P. horiana over time.

Fungicide Impact on in vitro Germination of Basidiospores of Puccinia horiana, the Causal Agent of Chrysanthemum White Rust