Pathogenicity ofPythiumspp. to seeds and seedling roots

摘要

Sixteen species ofPythium, two atypical species, and nine heterothallic isolates ofPythiumwere tested for their ability to infect the roots of tomato seedlings in a laboratory assay. Isolates of the same species, with the exception ofP. megalacanthum, were also tested in a glasshouse trial for capacity to cause damping-off of germinating seeds and seedlings of tomato cv. #x2018;Potentate#x2019;, pea cv. #x2018;Victory Freezer#x2019;, andIpomoea violaceaL. cv. #x2018;Heavenly Blue#x2019;.