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Downy Mildew Control Demands Quick Action

March 24, 2021
This agronomic image show downy mildew

Downy mildew is a difficult disease to control in leafy vegetables, and it’s become more challenging in recent years as the pathogen adapts to resistance genes and some chemical modes of action.

Preventive action is the most efficient path to economical control. Foliar applications should be made prior to disease development.

We know the best management is to prepare a plan, watch the weather and quickly trigger a treatment in the sprayer when cool, wet weather is on the way. Following that first application, continue treatment on a 7- to 10-day interval.

When downy mildew threatens the yield and quality of your leafy vegetable crop, consider a preventive application of Orondis® Ultra fungicide, a pre-mix with 2 effective modes of action, to help manage against resistance and provide the control you need. With higher pressure a given in this environment, we recommend treating downy mildew control in leafy vegetables at the maximum label rate: 8 fl oz/A.

In addition to consistent, effective control, key advantages of employing Orondis Ultra include:

  • Preventive and residual control from 2 active ingredients. Mandipropamid (FRAC group 40) is also the active ingredient in Revus® fungicide, a stand-alone product with proven performance against downy mildew. Oxathiapiprolin (FRAC group 49) delivers systemic, translaminar movement within the plant to help protect developing leaves and provide residual control.
  • Resistance management. Oxathiapiprolin is the only member of FRAC group 49 so it has no cross resistance to other fungicides. This makes it a good foundation product or rotation partner in a downy mildew control program.
  • Flexible application. Can be applied by ground or air. The pre-harvest interval is 1 day, and the re-entry interval is 4 hours.

For more information about Orondis Ultra or any other Syngenta product, please reach out to your local Syngenta representative or visit: http://www.syngenta-us.com/current-label/orondis_ultra_premix.

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All photos are either the property of Syngenta or are used with permission.

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