OTHER INCITANTS ASSOCIATED WITH PYTHIUM ROOT DIEBACK OF MUCK-GROWN CARROTS IN BRITISH COLUMBIA

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Abstract
Pythium sulcatum was recovered with a much higher frequency from necrotic compared to symptomless carrot rootlets and was isolated only from carrots grown in Pythium root dieback (PRD) problem soils. Fast-growing Pythium species were recovered with equal frequency both from necrotic and symptomless carrot rootlets grown in both PRD problem and non-problem soils. These facts implicate P. sulcatum as the primary incitant. Both necrotic and symptomless carrot rootlets from problem and non-problem soils contained Olpidium brassicae. Tobacco necrosis virus (TNV) was also recovered from both rootlet types, but only from carrots grown in problem soils. This association suggests that the TNV-O. brassicae complex may be involved in the PRD syndrome. Fast-growing Pythium species, O. brassicae, and TNV, but not P. sulcatum, were recovered from the rootlets of several common weeds. P. sulcatum was also recovered from lettuce, a common rotation crop.

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