Resource: 2023 Fungicide Decision Table

Thursday, March 2, 2023

Mancozeb, the active ingredient in the widely used products Manzate, Dithane, and Penncozeb underwent a review by the Pest Management Regulatory Agency. As a result of this review, the products have had their labels updated to include significant changes that came into effect on November 2022. 

The new label for a mancozeb product states that apple trees: 
  • May be treated with a maximum of only 4 applications each year.
  • Have a re-entry interval (REI) for hand thinning of 35 days.
  • Have a pre-harvest interval (PHI) of 77 days.
In conjunction with last year's changes to captan and other product label updates, I recognize that your decision making becomes even more complicated. I highly recommend that you create a spray plan for the upcoming season (that is open to modification) instead of making decisions in the moment. Planning ahead is becoming even more important with the reduced options and limitations.

I have compiled a '2023 Fungicide Decision Table' to summarize the remaining fungicide options including activity on summer diseases, compatibility with oil, REI, PHI etc. Thank you to Erika Bent with Agricultural Pest Monitoring (APM) and Danny Davison with Scotian Gold for their review and excellent suggestions.

(Please click the image to access the full size file for printing.)

NSFGA Spring Workshop Addresses Mancozeb

Please save the date for the NSFGA spring workshop that will be held on March 28th and March 29th. 

March 28th, 9:00am-12:00pm
Learning Session
Waterville Fire Hall
* virtual option available
Current topics include a presentation and panel on mancozeb label changes as well as a research update from Keith Fuller on replant disease.

March 29th, 9:00am-10:30am
Pruning demo: "Pruning for vigor: too much and too little"
CAP Farms, Grafton
Session will be held at CAP Farms in Grafton, and will be a demonstration on how to manage pruning in challenging blocks.

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