Apple Disease Update: Glomerella End Game

— Written By
en Español

El inglés es el idioma de control de esta página. En la medida en que haya algún conflicto entre la traducción al inglés y la traducción, el inglés prevalece.

Al hacer clic en el enlace de traducción se activa un servicio de traducción gratuito para convertir la página al español. Al igual que con cualquier traducción por Internet, la conversión no es sensible al contexto y puede que no traduzca el texto en su significado original. NC State Extension no garantiza la exactitud del texto traducido. Por favor, tenga en cuenta que algunas aplicaciones y/o servicios pueden no funcionar como se espera cuando se traducen.

English is the controlling language of this page. To the extent there is any conflict between the English text and the translation, English controls.

Clicking on the translation link activates a free translation service to convert the page to Spanish. As with any Internet translation, the conversion is not context-sensitive and may not translate the text to its original meaning. NC State Extension does not guarantee the accuracy of the translated text. Please note that some applications and/or services may not function as expected when translated.

Collapse ▲

Pre-harvest Glomerella Considerations

Glomerella

With ‘Gala’ apple harvest soon approaching in Western NC, it’s a good time to review fungicide application schedules prior to harvest. While it might be extremely inconvenient to diversify fungicide programs based on cultivar harvest date, adapting cultivar-specific fungicide programs for Glomerella-susceptible cultivars may save a lot of heartache (and money) during storage.

Glomerella 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 + Prophyt 4 pts/A
  • ~Day of Harvest: Merivon 5.5 floz/A + Captan 80WDG 2.5 lbs + Prophyt 4 pts/A

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 + Prophyt 4 pts/A
  • ~Day of Harvest: Merivon 5.5 floz/A + Captan 80WDG 2.5 lbs + Prophyt 4 pts/A

Plan C:

  • ~14 days out: ~ Merivon 5.5 floz/A + 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 + Prophyt 4 pts/A

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, 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.

 Cultivars not-susceptible to Glomerella:

  • -Scout the orchard. If little to no rot is present, you might be able to get by on a 14 day interval (depending on rains). Inspire Super, Aprovia, Topsin (if no resistance), Merivon, Luna Sensation can be applied to control other rots, however mix with ½ rate of Captan 4L or Captan 80WDG for resistance management. Merivon applied on day of harvest might help keep rots down in storage.