2024 Production Updates and Seasonal Outlook for NS_ 7th Blight Line Post_ May 15

Wednesday, May 15, 2024

Hello everyone, 

Here are the mid-week wild blueberry production updates. The weather across the province is looking decent and there are some good windows to spray.

Wild blueberry crop fields in Nova Scotia are in the middle to late susceptible period to Monilinia Blight (Figure 1). Please monitor your local weather forecasts and crop development to plan management activities accordingly.


Figure 1. Susceptible stages of wild blueberry to Monilinia Blight infection


GDD Updates_ May 14, 2024


Figure 2. GDD Summary, May 14, 2024

Wild Blueberry Sprout and Crop Development Stages

Sprout fields:

Pre-emergence herbicides should be applied ASAP. Sprout fields and areas with more than 230 GDD are risky to receive treatment applications, especially if you are going to put on Chikara and Ignite.


Crop fields:

Most areas in mainland Nova Scotia are now well above the 40% F2 stage of plant development which makes them susceptible to infection. A couple of sites we monitor in the Cumberland area are around 80-90% F2 in a tight cluster stage (Figure 3). Watch and monitor your weather forecasts closely. Higher temperatures require less duration of wetness to bring a high risk of infection. We are looking at around 15- 20 degrees Celsius in the next couple of days/

Please note, that an application should give protection to plants for about 7-10 days. If you already applied 1st spray, please check your record and note your own protection windows. There is a chance a second spray might be needed if we are getting some wet periods in the next few days.

We also recommend growers apply fungicides before a forecasted rain or soon after the rain stops and your fields are dry. Ideally, within 48 hours.


Figure 3. Wild blueberry tight cluster stage