Virginia Cotton: Unprecedented Hot Weather for Defoliation

As October approaches, we are now moving to the more normal period for defoliation and by the end of next week, we will perhaps start to see some fall temperatures and crisp mornings.  Still nothing that looks like cool weather is in the forecast.

  • Defoliation for the rest of this week and a good part of next week needs to continue to have a strong emphasis on defoliating with Dropp.
  • When using Prep as our boll opener, it looks like we can cut back to 6 ounces of Def when we use more than 3 ounces of Dropp and down to 4 ounces of Def when we use 4 ounces of Dropp.
  • When a quart of Finish is in the picture, it has not needed very much help at all.
  • In this hot weather, all Finish needs is 1.6 to 2 ounces of Dropp to get close to 100%.
  • A few folks are adding an ounce or 2 of Def for some assurance, and several of us actually like the smell of Def.
  • Once we get back into the 70’s, we can probably start thinking about some different combinations with more emphasis on Def and the herbicides and less on the Dropp. With 80 degrees, more than this is working great, but is overkill.
  • I feel like even my suggestions here are too much because it all looks so good.
  • We should be able to get 2/3 to 3/4 of our cotton defoliated before the cooler weather gets here around October 4.
  • Cotton planted on May 21th has now hit that 2100 heat unit mark which is the typical maturity threshold. I think much of this third week of May planted cotton will be reaching maturity next week.
  • Seems like the fields we will wait on until that second week of October are the fields that were planted in the last week of May, particularly with a large top crop.
  • Nevertheless, we still have time to wait on the latest cotton as we should maintain good heat unit accumulation on until the middle of October and still have some decent defoliation weather.



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