Comparative Virulence ofAphanomyces euteichesf. sp.phaseoliandPythium ultimumonPhaseolus vulgarisat Naturally Occurring Inoculum Levels

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Abstract
A. euteiches f. sp. phaseoli occurred commonly in the sandy soil of Wisconsin''s [USA] major snap bean production area. In greenhouse testing of soil inoculum levels typical for the area, this pathogen caused more damage to beans than did P. ultimum at 24 and 28.degree. C. The 2 pathogens were equally damaging to beans at 20.degree. C, and at 16.degree. C P. ultimum caused more severe disease than did A. euteiches f. sp. phaseoli. When plants were infected by both pathogens simultaneously, disease severity was similar at all temperatures tested. Plants were seldom killed by either pathogen alone, but 30-40% of the plants grown at 20 or 24.degree. C were killed if simultaneously infected by both pathogens.

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