Effect of Cropping Systems on Densities of Verticillium dahliae
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The Cotton Foundation 2014. The density of Verticillium dahliae (causal agent of Verticillium wilt of cotton) microsclerotia was monitored over a 7-yr period in fields located in the Southern High Plains of Texas. Included in the project were eight sites that were essentially in continuous cotton (short to no rotation from cotton); six sites that were planted with hosts for V. dahliae approximately 50 to 71% of the time (intermediate rotation from cotton); and 12 sites that were primarily planted to grain crops (< 2 cotton crops) (long rotation from cotton). There was a decline in the density of microsclerotia at a rate of 1.4 microsclerotia (MS)/cm3 soil per year in fields that were in a long rotation from cotton, but no consistency in microsclerotia dynamics in the intermediate and short rotations from cotton over time. There was an average of 6.7, 6.9, and 26.1 MS/cm3 soil, for the long, intermediate, and short/no rotation from cotton, respectively, in the tested sites. Irrigation rate was associated positively with microsclerotia density for both continuous cotton and in a cotton/cotton/ sorghum rotation. Microsclerotia density was correlated (R2 = 0.23) with the incidence of wilt when combined across 26 sites. In sites that have a high density of microsclerotia, it might be necessary to manage irrigation to create a less conducive environment for wilt development, rather than using crop rotation to reduce microsclerotia density.
JOURNAL OF COTTON SCIENCE
author list (cited authors)
Wheeler, T. A., Bordovsky, J. P., Keeling, J. W., & Woodward, J. E.
complete list of authors
Wheeler, Terry A||Bordovsky, Jim P||Keeling, J Wayne||Woodward, Jason E