Role ofPythiumin Sugarcane Stubble Decline: Pathogenicity and Virulence ofPythiumSpecies

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Abstract
Ten isolates of Pythium arrhenomanes and a single isolate of P. spinosum caused root rot and significant reductions in growth of sugarcane cultivar CP 70-321 in pathogenicity tests. Isolates of six other Pythium spp. were tested, and none consistently affected plant growth. Disease severity was greatest in experiments conducted under moderate temperature conditions. In tests conducted at high temperatures, the predominant symptoms were root discoloration and feeder root necrosis, and a range in virulence was apparent among isolates of P. arrhenomanes.

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