Mummy Berry Forecast Post #4– April 29th, 2022

Friday, April 29, 2022

Early emerged apothecia were still active when checked this morning.  Other sites in the valley have newly emerged apothecia.  Cool, wet weather will lengthen the window for activity and emergence of the apothecia.  

Some varieties did not advance a great deal through the week while others have, therefore it is very important to check your own plantings during this wet weather in order to correctly time spray applications for Monilinia blight control.  

Early varieties this morning were at 62% F2 stage, Duke/Bluegold/Draper were at 28-36% while Burlington 18% at the F2 stage. As a reminder, these observations are based on plantings in the Berwick- Aylesford area on the valley floor.

Looking at the weather forecast for the weekend and next week, there will be a reprieve from the wet weather late Sunday and Monday.  Varieties that have not been sprayed but reached the 40% (or greater) F2 stage should be sprayed with a group 3.   You will be relying on the product's post infection activity to control infections that may have taken place over the last few days.   The fungicide will then give about 10 days protection going ahead through the next rain events (which according to the forecast may occur Tuesday-Thursday next week).

Varieties which were sprayed this past Tuesday may also need to be re-sprayed next week if there is a forecast of extended wet weather.  

Applications for Mummy berry/Monilinia control should be timed when blueberry buds are at least at 40% F2 stage and before the next forecasted wet period.

For product selection please refer to this table: Clickhere

Rain interval for most of these products is one hour or when dry.