Mummy Berry Post #4: May13th, 2021

Thursday, May 13, 2021

A quick update on Mummy Berry Development: 

Floral bud counts on May 12, 2021 from the Annapolis Valley Nova Scotia.

Early variety with 100% floral buds well advanced of the F2 stage (Figure 1).

Figure 1. Floral buds of an earlier variety well advanced of the F2 stage.

Significant floral bud development was observed for Burlington with 88% of buds at F2 stage (Figure 2). 

Figure 2. Floral buds of Burlington.

Whereas Duke had 80% buds at F2 stage (Figure 3).

Figure 3. Floral buds of Duke.

Most of the apothecial cups of Mummy berry have reached maturity level and may have released many ascospores (Figures 4).

Figure 4. Mature apothecial cups.


Given the rain for the last couple of days, and warmer weather on May 13-15, the conditions will be conducive to disease establishment with high risk of infection on all varieties.  We expect most of the growers have made one application to protect against mummy berry already. Otherwise, they should plan for the spray within the coming 2-3 days.

Products with the active ingredient propiconozole (Pivot, Bumper, Tilt, Mission, Fitness, and Propi Super) can be applied after an infection event, providing up to 72 hour ‘back action’, in addition to being excellent protectants against future infections for 7-10 days after application. Quilt is listed as a preventative fungicide, but also displays systemic and curative properties.

A complete list of registered products can be found in Perennia's Highbush Blueberry Disease and Insect Management Guide.

 As a reminder, these recommendations are based on conditions observed in the Annapolis Valley, Nova Scotia and may not be applicable to your location. Infection periods only occur when bud development has reached the F2 stage, monilinia apothecial cups are present, and temperature and moisture levels are ideal.