Wound-Healing Process in Geranium Cuttings in Relationship to Basal Stem Rot Caused byPythium ultimum

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Abstract
Cuttings of P. .times. hortorum Baily cv. Blaze, Yours Truly and Salmon Irene were inoculated with an isolate of P. ultimum at various stages in the wound-healing process. Disease severity and incidence decreased as the period of time between wounding and inoculation increased, particularly with ''Yours Truly''. Extensive basal stem rot occurred on all freshly broken cuttings but was restricted on cuttings that had been healing 1 day before inoculation. Basal stem rot rarely occurred on cuttings that had been healing for 2 days or longer before inoculation. Disease severity decreased in all 3 cultivars when Rootone F or Hormodin No. 1 was used before inoculation. Severity ratings generally increased as the time of air-drying before inoculation increased.

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