Second Post-bloom Spray Growth Stage Product (rate/A) FRAC Code Relative cost Target Diseases (per acre/application) Second post-bloom Same fungicides as immediate BR, PM, DM spray pre-bloom to early bloom (no longer than 10 days after the last PLUS* spray) Ridomil Gold MZ (2.5 lb)** 4 + M $$$$ DM or Ridomil Gold Copper (2 lb)** 4 + M1 $$$ or Revus (8 fl oz) 40 $$$ or Presidio (3-4 fl oz) 43 $$$ or Ranman (2.1-2.75 fl oz) 21 $$ or Forum (6 oz) 40 $ or Zampro (11-14 fl oz) 45 + 40 $$$ * The second post-bloom spray is near the end of the critical period (immediate pre-bloom through 3 to 4 weeks after bloom) for controlling fruit infection by black rot, powdery and downy mildew. However, cluster stems (rachis) and leaves will remain susceptible to powdery and downy mildew throughout the growing season; therefore, a good fungicide program needs to be maintained throughout the season. **If conditions are highly conducive for downy mildew development (rainy and cool to warm temeratures (64 to 76 degrees F )), Ridomil Gold MZ or Ridomil Gold Copper is recommended.
Second Post-bloom Spray Growth Stage Product (rate/A) FRAC Code Relative cost (per acre/application) Target Diseases Second post-bloom spray (no longer than 10 days after the last spray) Same fungicides as immediate pre-bloom to early bloom PLUS* Ridomil Gold MZ (2.5 lb)** or Ridomil Gold Copper (2 lb)** or Revus (8 fl oz) or Presidio (3-4 fl oz) or Ranman (2.1-2.75 fl oz) or Forum (6 oz) or Zampro (11-14 fl oz) 4 + M 4 + M1 40 43 21 40 45 + 40 $$$$ $$$ $$$ $$$ $$ $ $$$ BR, PM, DM DM * The second post-bloom spray is near the end of the critical period (immediate pre-bloom through 3 to 4 weeks after bloom) for controlling fruit infection by black rot, powdery and downy mildew. However, cluster stems (rachis) and leaves will remain susceptible to powdery and downy mildew throughout the growing season; therefore, a good fungicide program needs to be maintained throughout the season. **If conditions are highly conducive for downy mildew development (rainy and cool to warm temeratures (64 to 76 degrees F )), Ridomil Gold MZ or Ridomil Gold Copper is recommended.
2017-Grape-Fungicide-Spray-Guide-FINAL-12matmm.docx