Poor spray application and excessive dust affect weed control in sprayer wheel tracks. This fact sheet shows how to improve weed control in wheel tracks during summer fallow spraying.

Key points

• Using extra wheel-track nozzles for knockdown herbicides (non-residual) can improve spray application.
• Assess application in and near the wheel-tracks with fluorescent dye or water-sensitive paper.
• Generally, dust is only reduced when:
  • soil moisture is present
  • speed is reduced or
  • more permanent wheel tracks are used.

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