HOT-WATER TREATMENT TO CONTROL COLLETOTRICHUM ACUTATUM ON CORMS OF ANEMONE CORONARIA

A.W. Doornik
Anemone corms may be contaminated with the fungus Colletotrichum acutatum causing leaf curl and leaf necrosis. It was investigated whether a hot-water treatment (hwt) could control the disease. More than 99% of spores suspended in water were killed by hwt of 1 minute at 47.5°C. A treatment of contaminated corms for 1.5 h at 47.5°C or 1 h at 50°C resulted in more than 99% plants without symptoms of necrosis. Presoaking of corms in water did not alter the lethal effect on the fungus, nor did the date of application of hwt between harvest and normal planting time influence the results.

Germination of corms after hwt at either temperatures was only slightly reduced. However, germination was severely reduced after hwt of corms that had a poor germination potential. Storage of the treated corms in moist vermiculite at 20°C for 4 days improved germination.

It is concluded that a hot-water treatment of 1.5 h at 47.5°C or 1 h at 50°C can be used as an effective method against Colletotrichum acutatum in Anemone coronaria.

Doornik, A.W. (1990). HOT-WATER TREATMENT TO CONTROL COLLETOTRICHUM ACUTATUM ON CORMS OF ANEMONE CORONARIA. Acta Hortic. 266, 491-494
DOI: 10.17660/ActaHortic.1990.266.65
https://doi.org/10.17660/ActaHortic.1990.266.65

Acta Horticulturae