IN VITRO ACTIVITY OF FUNGICIDES AGAINST COLLETOTRICHUM FRAGARIAE
Twenty-eight fungicides were tested for in vitro activity against Colletotrichum fragariae Brooks, the causal fungus of strawberry anthracnose crown rot. After five days growth on fungicide-amended potato dextrose agar, colony diameter was significantly reduced compared to the control by all fungicides at concentrations of 50 parts per million active ingredient (a.i.) or greater, and by all fungicides except folpet at 5 ppm. Diniconazole, flusilazol, benomyl, propiconizole, nuarimol, fenarimol, and bitertanol severly limited growth at 0.5 ppm a.i. and higher concentrations. PCNB, mancozeb, maneb, myclobutanil, thiram, DCNA, iprodione, triforine, chlorothalonil and triadimefon reduced colony diameter by 20% or more at 5 ppm a.i. In general the systemic fungicides (particularly the ergosterol biosynthesis inhibitors) reduced growth of C. fragariae much more than the conventional fungicides tested. However, most of these systemic fungicides currently are not registered for use on strawberries in the United States.
Smith, B.J. and Black, L.L. (1993). IN VITRO ACTIVITY OF FUNGICIDES AGAINST COLLETOTRICHUM FRAGARIAE. Acta Hortic. 348, 509-512