ISHS Acta Horticulturae 177: IV International Symposium on Flower Bulbs
INDICATIONS FOR TRANSMISSION OF COLLETOTRICHUM ACUTATUM VIA ROOTS OF ANEMONE CORONARIA |
| Author: | A.W. Doornik |
| Abstract:
Corms of Anemone coronaria infected by Colletotrichum acutatum Simmonds may give rise to curled or necrotic leaves. Spread of the disease in the field is mainly caused by spores present on necrotic leaves or stems, that are dispersed by rain or dew. Subsoil spread of the disease may be possible by transmission of C. acutatum via roots of anemone. Corms from a diseased stock yielded less necrotic plants when planted separately in pots than when planted in groups of 40 corms in a container. Mycelium of C. acutatum did not grow through unsterilized soil (personal observation). Healthy corms planted at distances of 10, 20, 30 or 40 cm from inoculum, however, showed symptoms of necrosis within 60 days after inoculation. Meanwhile the roots of the plants had grown the length of the container and had reached the inoculum. Isolation of the fungus was possible from roots of plants showing necrosis. When roots of these plants, used as inoculum, were placed either on top of or 2 cm under healthy planted corms, plants showed symptoms of necrosis. It therefore seems probable that C. acutatum is transferred from diseased to healthy surrounding plants via roots. | |
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