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Corn+Soybean Digest

Soybean Rust Spray Tips

Asian soybean rust is a serious disease, but it can be controlled if the right fungicide is applied with the most effective equipment at the right time. Here are some key recommendations for obtaining thorough, uniform spray coverage to the plant:

  • Choose the appropriate size and type of nozzles and operate them at a pressure that will allow them to produce small- to medium-size droplets.

  • Keep spray volume (application rate) above 15 gal./acre for best results.

  • Try running the sprayer at slightly higher pressures than usual. Higher spray pressure usually helps the droplets penetrate into the canopy better.

  • Choose “low-drift” nozzles, and operate them at slightly higher pressures (60-70 psi). These nozzles allow you to increase pressure without increasing the number of small, drift-prone droplets.

  • Use directed spraying to improve coverage, if applicable.

  • Use twin nozzle/pattern technology. Two nozzles (or spray patterns) angled (one forward, one backward) work better than single nozzles spraying down.

  • Employ air-assisted technology, if affordable, to provide the best coverage and droplet penetration into the canopy when soybeans reach their full or near-full growth stage.

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