disease is caused by the fungus Mycosphaerellaligulicola. The ray
flowers (marginal flowers of an inflorescence) are attacked, so that the blooms
are deformed and one-sided. Early infection may cause blasting of the buds.
mancozeb, myclobutanil, thiophanate methyl or propiconazole are effective as a
foliar spray when applied at label rates.
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