End of Season Glomerella / Bitter Rot Considerations

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GLS Early Leaf

I’ve been out of the office for the past couple of weeks at a national conference and on puppy parental leave. I finally had an opportunity to drive through our research orchards today and with these neverending afternoon rain showers GLS has finally exploded on our unsprayed trees in our “Glomerella Gala” block. With conditions still favorable for GLS and bitter rot, I encourage you to continue on 7 to 10 day fungicide application intervals throughout harvest. In some low-lying, particularly wet blocks you may even want to consider tightening to 5 day intervals for the final few weeks. While it might be extremely inconvenient to diversify fungicide programs based on cultivar harvest date, adapting cultivar-specific fungicide programs for cultivars highly susceptible to bitter rot may save a lot of heartache (and money) during storage. Here are some strategies:
Bitter Rot Susceptible Cultivars 14 days prior to harvest:
Plan A:
  • ~14 days out: Captan 80WDG 3.75lb/A (or 4L 2.5 qt/A) + Prophyt 4 pts/A
  • ~7 days out: Merivon 5.5 floz/A + Captan 80WDG 2.5 lbs
  • ~Day of Harvest: Merivon 5.5 floz/A + Captan 80WDG 2.5 lbs

Plan B:

  •  ~14 days out: Captan 80WDG 2.5 lb/A + Ziram 3 lb/A
  • ~7 days out: Merivon 5.5 floz/A + Captan 80WDG 2.5 lbs ~Day of
  • Harvest: Merivon 5.5 floz/A + Captan 80WDG 2.5 lbs

Plan C:

  •  ~14 days out: Captan 80WDG 2.5 lbs + Prophyt 4pts/A
  • ~7 days out: Captan 80WDG 3.75lb/A (or 4L 2.5 qt/A) + Prophyt 4 pts/A
  • ~Day of Harvest: Merivon 5.5 floz/A + Captan 80WDG 2.5 lbs

Glomerella Susceptible Cultivars more than 14 days from harvest:

Application of Captan 80WDG 3.75 lb/A (or different formulation equivalent)+ Prophyt 4 pts/A OR Captan 80WDG 2.5 lb/A + Ziram 3 lb/A on a 7 to 10 day interval has worked well for us. If flyspeck/sooty blotch, or bot rots are a concern, you may want to include Inspire Super, Cevya, Topsin (or different t-methyl product), or Aprovia tank mixed with Captan + Prophyt. Keep in mind, Inspire Super, Topsin, or Aprovia applied alone will NOT provide adequate control of Glomerella leaf spot or fruit rot.