Leaf Spot Problem Increases In Georgia
Amanda Huber
Southeast
More Traditional Disease
"Since around 2004 and 2005, consultants in southwest Georgia have been talking about leaf spot getting on bolls, bracts and leaves of their crops. We've always assumed it was Stemphyllium leaf spot or Cercospora gossypina," Kemerait says. "However, we are seeing a completely different aspect: Corynespora leaf spot disease."
Kemerait says the wetter conditions this year have likely played a role in the expression of this leaf spot.
"To demonstrate what it can do, across varieties you will see most of the upper canopy intact, but much of the underneath will be missing. In some fields that were five or 10 weeks away from harvest, the bottom 60 percent of the canopy was missing. One consultant pulled up a cotton plant and counted 21 nodes, and the bottom 11 nodes were void of any leaves."
source : cottonfarming
Amanda Huber
Southeast
More Traditional Disease
"Since around 2004 and 2005, consultants in southwest Georgia have been talking about leaf spot getting on bolls, bracts and leaves of their crops. We've always assumed it was Stemphyllium leaf spot or Cercospora gossypina," Kemerait says. "However, we are seeing a completely different aspect: Corynespora leaf spot disease."
Kemerait says the wetter conditions this year have likely played a role in the expression of this leaf spot.
"To demonstrate what it can do, across varieties you will see most of the upper canopy intact, but much of the underneath will be missing. In some fields that were five or 10 weeks away from harvest, the bottom 60 percent of the canopy was missing. One consultant pulled up a cotton plant and counted 21 nodes, and the bottom 11 nodes were void of any leaves."
source : cottonfarming
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