Cotton Variety Response to Verticillium Wilt - Farwell, TX

Trial Objective

  • ​Verticillium wilt, caused by the soilborne fungus Verticillium dahliae, can be a yield-limiting disease in cotton grown on the High Plains of Texas. 
  • Selecting tolerant cotton varieties is the primary option for managing Verticillium wilt.
  • Field tests were conducted for the Deltapine® brand to evaluate cotton varieties in West Texas for yield potential and tolerance to diseases such as Verticillium wilt. This information can be used to help determine how cotton varieties may fit on fields with a history of the disease.

Research Site Details

 
  • ​The field test site has a known history of Verticillium wilt disease.
  • Cotton varieties were planted at 3-4 seeds/ft on 40-inch rows. Understanding the Results Table 1 ranks the cotton varieties by the yield produced from highest to lowest at this location.
  • DP represents Deltapine® cotton varieties from Bayer Crop Science (i.e. DP 1822 XF). 
  • FM represents FiberMax® cotton varieties from BASF Corporation (FM 2484B2F and FM 2334GLT). 
  • NG represents NexGen® cotton varieties from Americot® cotton seed (NG 3500 XF and NG 4545 B2XF)
 
  • ​Across all varieties, the average cotton lint yield was 1,334 lb/acre and the median yield was 1,364 lb/acre. The average disease rating for Verticillium wilt was 7 at this location, with a range of 4 to 9. The seven cotton varieties that yielded above the median had an average disease rating of 5.8, and the seven cotton varieties that yielded below the median had an average disease rating of 7.3. 
  • DP 1822 XF had the highest cotton yield at this location, yielding 5% and 8% more than the Verticillium wilt-tolerant checks NG 3500 XF and FM 2334GLT, respectively. DP 1822 XF also yielded 13% and 23% higher than the Verticillium wilt-tolerant checks FM 2484B2F and NG 4545 B2XF, respectively. DP 1822 XF is an XtendFlex® cotton variety developed for West Texas with Verticillium wilt tolerance. 
  • DP 1820 B3XF is a Bollgard® 3 XtendFlex® cotton variety that also showed tolerance to Verticillium wilt and good yield potential at this location. DP 1909 XF also showed good yield potential and is adapted to the Northern High Plains and Panhandle. Yielding near the average for lint yield at this location was DP 1908 B3XF, which is adapted to the Northern High Plains and Panhandle. 
  • DP 1823NR B2XF and DP 1851 B3XF were the lowest yielding cotton varieties at this location, showing poor tolerance to Verticillium wilt. These varieties are not particularly well adapted to West Texas.

What Does This Mean for Your Farm?

  • ​Producers have many choices when selecting cotton varieties for Verticillium wilt-infected acres in the latest germplasms with the latest technologies. One of the best management strategies is to select tolerant varieties.
  • In fields with a history of Verticillium wilt, growers should plant varieties with good Verticillium wilt tolerance and high yield potential. • This trial is conducted on an annual basis and will be repeated next year.
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