Abstract
Several Pythium species are isolated commonly from roots of sugarcane plants (interspecific hybrids of Saccharum) grown in field soils. To compare the effects of infection by one or several Pythium species, pathogenicity tests were conducted with P. arrhenomanes, P. catenulatum, P. irregulare, P. spinosum, and two unidentified Pythium species. Isolates of P. arrhenomanes caused significant growth reductions and severe root rot. Isolates of P. irregulare and P. spinosum caused significant reductions in root weight but varying effects on shoot number and weight (.)
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