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OSO Fungicide

OSO is a polyoxin D zinc salt fungicide that controls diseases on vegetable and fruit crops.

Oso hero image

OSO is for use against the following diseases/pathogens on the following crops:


  • Anthracnose
  • Early blight
  • Gray mold
  • Gummy stem blight
  • Powdery mildew
  • Scab
  • Target leaf spot/Corynespora leaf spot

Pome and Stone Fruits:

  • Alternaria leaf spot
  • Leaf blotch
  • Powdery mildew
  • Scab
  • Botrytis blossom blight


  • Black scurf
  • Early and late blight
  • White mold


  • Alternaria brown spot
  • Botrytis rot
  • Septoria spot

OSO Applications

Active Ingredient: Polyoxin D zinc salt

Rates: Low rate (3.75 fl. oz/acre) for preventive applications before onset of visible disease, in periods of low disease pressure or in a tank mix with other fungicides for resistance management. Higher rates (6.5 to 13.0 fl. oz/acre) when disease pressure is high or in stand-alone applications.

Re-entry Interval: 4 hours

Pre-harvest Interval (PHI): 0

Exempt: Residue tolerance (no MRLs)

Application Method: Ground, chemigation

PPE: Long-sleeved shirt and long pants, socks, shoes and chemical-resistant gloves


FIFRA Recommendation 2(ee) Labels