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Summary

Metribuzin is a soybean herbicide that possesses a triazine mode of action. The candidate was involved in a three-year research project evaluating the potential of metribuzin applications for the management of glyphosate-resistant Palmer amaranth after corn and other fallow field situations.The results of this research are expected to change the current metribuzin label during 2020 providing Georgia growers another tool to manage the Palmer amaranth seed bank after corn is harvested and the year before planting cotton.

Situation

Metribuzin is a soybean herbicide that possesses a triazine mode of action. Metribuzin and atrazine both contain the triazine mode of action. This herbicide offers Georgia growers a unique ability to utilize a unique herbicide mode of action that would provide effective control while mitigating additional resistance development. The candidate was involved in a three-year research project evaluating the potential of metribuzin applications for the management of glyphosate-resistant Palmer amaranth after corn and other fallow field situations. It is critical to prevent Palmer amaranth from going to seed after corn harvest because the female Palmer amaranth plant can produce between 400,000 to 500,000 seed per plant. A residual herbicide can be an effective tool in preventing emergence after harvest. However, producers realize selecting an herbicide to use for this approach must be well thought out to avoid additional resistance development and damage to the next crop.

Response

The project consisted of two experiments conducted to generate research-based information about the possible use of metribuzin from 2017 to 2019. The candidate assisted Dr. Stanley Culpepper, UGA Cotton Weed Specialist, with the implementation, data collection and harvest for the duration of these experiments.

Impact

The results of this research are expected to change the current metribuzin label during 2020 providing Georgia growers another tool to manage the Palmer amaranth seed bank after corn is harvested and the year before planting cotton. According to Georgia Ag Statistics, in 2019 Georgia growers planted 395,000 acres of corn and 1,400,000 acres of cotton. If an updated label is obtained, growers are expected to reduce hand weeding costs by $4.00 an acre in their cotton crop after corn which could potentially save $1,580,000.

State Issue

Plant Production

Details

  • Year: 2020
  • Geographic Scope: State
  • County: Colquitt
  • Location: College Station, Athens
  • Program Areas:
    • Agriculture & Natural Resources

Author

  • Kichler, Jeremy M
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