Mummy Berry 2020 - Post #2

Saturday, May 2, 2020

A quick update on Mummy Berry Development.

Floral bud counts on Friday May 1, 2020 from the Annapolis Valley Nova Scotia.
Duke block at 40 - 60% F2 bud development (Figure 1). 
Figure 1
Other varieties in the same field only at 25 - 36% F2 bud development and many are still immature (Figure 2).

Figure 2
A lot of apothecia are developing and some of the mature apothecia are releasing ascospores (Figures 3 and 4).

Figure 3
Figure 4
Given the anticipated rain and warmer weather expected this weekend, there is a risk of an infection for earlier fields and varieties.

In preparation for an infection period, make sure you have product on-hand.

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 off 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 spore cups are present, and temperature and moisture levels are ideal. The decision to spray should be based on these conditions being observed in your particular field. For detailed information please check out Perennia's Management of Mummy Berry Disease in Highbush Blueberry