Inoculum Densities ofPythium aphanidermatumin Soils of Irrigated Sugar Beet Fields in Arizona

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Abstract
Inoculum densities of P. aphanidermatum in commercial sugar beet fields were estimated by using a species-specific isolation medium. Fields were not uniformly infested with P. aphanidermatum; intrafield inoculum densities exhibited a moderately clustered pattern of distribution (for the negative binomial probability distribution, k = 1.15) and interfield inoculum densities exhibited a highly clustered pattern of distribution (k = 0.28). No fluctuations in inoculum densities were detected in soil samples collected periodically from infested fields prior to the onset of root infection, which occurred about 9 mo. after planting. Subsequent to root infection, high population densities of the fungus (232-5120 propagules/g of soil) were detected in rhizosphere soil immediately adjacent to lesions on infected sugar beet tap roots.

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