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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Ron Vargas, Fann Advisor, Madera County
Brian Marsh, Fann Advisor, Kern County
Tome Martin Duvall, SRA, Madera County
University of California Cooperative Extension
559-675-7879, Ex1. 212

BXN (Buctril) transgenic tolerant cotton has been tested on a limited basis in University trials in 1997 and 1998 with extensive testing in 1999. In 1999, due to the changes in “One Quality Law” governed by the SJY Cotton Board, several thousand acres o f Stoneville BXN-47 cotton are now being commercially grown. Results of University trials, as well as grower experience, has indicated excellent control of most summer annual broad leaf weeds when…


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