Field evaluation of fungicides for the control of Chrysanthemum flower blight

Seventeeen fungicidal spray treatments were evaluated in the field to determine their efficiency in controlling flower blight of chrysanthemums. The fungi in the disease complex were Altenaria alternata, Botrytis cinerea, Itersonilia perplexans, Mycosphaerella ligulicola, and Stemphylium vesicarium. Appreciable disease control was obtained with all the fungicides tested, chlorothalonil being the most satisfactory individual chemical; mancozeb and captafol also gave reasonable control. Combinations of two fungicides did not offer any major advantage.