ISHS Acta Horticulturae 177: IV International Symposium on Flower Bulbs
INVESTIGATION OF FUNGICIDE TREATMENTS TO CONTROL ANEMONE LEAF CURL DISEASE CAUSED BY A SPECIES OF COLLETOTRICHUM |
| Author: | T.M. O'Neill |
| Abstract:
Twenty-nine fungicides were screened for activity against isolates of a species of Colletotrichum obtained from anemone with leaf curl symptoms. Prochloraz, propiconazole, and fentin acetate at 100 ppm completely inhibited mycelial growth on PDA and at 10 ppm strongly inhibited growth. Benomyl, captafol, dichlofluanid, imazalil, thiram and tolclofos-methyl at 100 ppm inhibited growth by more than 80%. Two isolates of a species of Colletotrichum from anemone and single isolates of C. coffeanum and C. gloeosporioides did not differ greatly in their sensitivity to 15 fungicides. In glasshouse pot experiments, a single drench of captafol and thiram, but not of benomyl, imazalil, prochloraz and propiconazole, significantly reduced disease incidence. Sprays of benomyl, captafol and propiconazole gave a small reduction in disease incidence. The effectiveness of seven fungicides in limiting spread of leaf curl was tested in a replicated field trial. Plants drenched twice with benomyl, captafol, prochloraz and propiconazole had a lower disease incidence three months after infection was established in the trial area than control plants drenched with water. Fosetyl-Al, imazalil and thiram did not reduce disease incidence. Propiconazole was phytotoxic and greatly reduced plant growth and flower production. | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
