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Title: Soil treatments against Fusarium oxysporum f. sp. vasinfectum race 4

Author
item Bennett, Rebecca
item Spurgeon, Dale
item DETAR, WILLIAM - Retired ARS Employee
item Hanson, Bradley
item Gerik, James
item HUTMACHER, ROBERT - University Of California
item DAVIS, MICHAEL - University Of California

Submitted to: American Phytopathological Society
Publication Type: Abstract Only
Publication Acceptance Date: 5/4/2009
Publication Date: 6/1/2009
Citation: Bennett, R., Spurgeon, D.W., Detar, W.R., Hanson, B.D., Gerik, J.S., Hutmacher, R.B., Davis, M.R. 2009. Soil treatments against Fusarium oxysporum f. sp. vasinfectum race 4. American Phytopathological Society. Phytopathology. 99:S10.

Interpretive Summary:

Technical Abstract: Few economically feasible disease management options are available for California cotton producers with fields infested with race 4 of Fusarium oxysporum f. sp. vasinfectum. For treating soil to reduce inoculum levels, past studies indicate that solarization and fumigation with metam-sodium may be affordable, yet effective solutions. To test their applicability to race 4 in cotton, we compared four soil treatments: a six-week-long summertime solarization, metam-sodium (75 gal/acre), methyl bromide-chloropicrin (50:50, 350 lbs/acre, tarped) and 1,3-dichloropropene-chloropicrin (40:60, 31.5 gal/acre, tarped). The treatments were applied in plots in a field naturally infested with race 4, using a split-plot design, with soil treatment as the whole plot factor and cotton cultivar as the subplot. Four cultivars representing a range of susceptibilities to race 4 were used to evaluate the treatments. We will present observations from the first season indicating that soil solarization worked as well as more costly, tarped fumigants (methyl bromide-chloropicrin and 1,3-dichloropropene-chloropicrin) as evidenced by plant survival.