THE PATHOGENICITY OF COLLETOTRICHUM DEMATIUM TO TABLE BEETS AND OTHER HOSTS

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Abstract
Colletotrichum dematium caused a root disease of table beet. Compared with C. atramentarium it was more pathogenic on beet and spinach and less pathogenic on carrot, potato, and tomato. With both species of fungi, at least 60 hours at high humidity was best for foliage infection to become well established. Beet seedlings were more susceptible to C. dematium than partially grown beet roots. Pathologically and morphologically, the beet isolate of Colletotrichum conformed to descriptions of C. spinaciae, a synonym of C. dematium.A culture seeding rate of 200,000 spores/ml was required for optimum spore production with C. dematium. Optimum growth and sporulation occurred at 22° to 24 °C. Growth and sporulation of the fungus was inhibited at 5° and 31 °C and 10° and 29 °C, respectively.C. dematium may not be an important pathogen of beets as it only occurred where beets were grown successively in the same soil.

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