Assessment of Fusarium in the San Joaquin Valley: Field Evaluations and Variety Screening


Fusarium w.ilt of cotton in California has been considered a potentially serious fungal disease caused by the organism Fusarium oxysporum vas infectum (also called ”FOV”) for many decades in several areas of the San Joaquin Valley (SJV). In the past, however, damage associated with FOV in SJV cotton has been notable only in areas with the combination of: (a) moderate to high populations of one or more specific races of FOV (usually race 1 ); (b) soils with a sandy or sandy loam texture; and (c) where root lrnot nematodes were present in high-enough populations to cause some significant root damage. Past research generally indicated that FOV damage was worst when both FOV inoculum and nematodes were present in relatively high…


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Germplasm evaluation of cotton accessions from the U.S. Cotton Germplasm Collection, USDA-ARS (Landraces ofMexico)


The Gossypium hirsutum gene pool from Mexico encompasses a wide range of habitats and is one of the primary sources for improvement of most of the Acala and Upland cotton growing in the world today. Despite the existence oflarge collections of landraces of G. hirsutum, they are poorly evaluated and difficult to characterize for their value in
the collection and potential for cotton…


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