Occurrence ofFusariumSpecies in Roots and Stalks of Symptomless Corn Plants During the Growing Season

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Abstract
The same Fusarium spp. were isolated throughout 2 seasons (1974-1975) from roots and stalks of 3 corn [Zea mays] hybrids differing in resistance to root lodging. Whereas Fusarium spp. infected 90% of the plants sampled by July and 100% by mid-Aug., they were isolated infrequently from stalks in July until after silking. By early Sept., about 90% of the stalks were infected, even though no symptoms of stalk rot were apparent. As the season progressed, often more than 1 Fusarium sp. was isolated from a single stalk and as many as 5 spp. were isolated from some stalks by mid-Oct. F. oxysporum and F. solani were isolated from roots more frequently than from stalks and F. moniliforme and F. tricinctum were isolated from stalks more frequently than from roots. F. roseum appeared more frequently in roots than in stalks until the end of Aug. when it occurred more frequently in stalks. Of F. roseum populations, those in cultivar Equiseti predominated followed by Acuminatum; Graminearum was only occasionally isolated from roots or stalks. When cornstalk stubble was sampled from the same plot in the spring of 1976, the Fusarium spp. were the same as those isolated the previous fall, except that F. moniliforme was absent.

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