Mummy Berry 2019 #6

Monday, May 13, 2019

From observations made on Monday May 13, 2019 some blueberry varieties have advanced past the F2 bud stage, and viable apothecia cups are still present. There is potential for an infection period during the rain forecast for Tuesday May 14, 2019 and Wednesday May 15, 2019. If you applied protective sprays for the infection period between Friday May 10 and Saturday May 11, you should still have protection during this next infection period. If you have not applied protection up to this point you can still achieve control by using a product with back-action capability (Topas, Mission, etc)  within 72 hours of the start of the infection period. 

Bud stage from May 13, 2019

Apothecia cups from May 13, 2019

As a reminder these recommendation are based off of observations made at a site in the Annapolis Valley, and may not be applicable to your specific field. The decision to spray should be based off scouting and observation made in your own field. Infection periods only occur when blueberries are at a susceptible bud stage, apothecia cups are present, and weather conditions are suitable. For more information on highbush blueberries, mummy berry disease, and fungicides please refer to Management of Mummy Berry Disease in Highbush Blueberry

Mummy Berry 2019 #5

Friday, May 10, 2019

There is a high likelihood of an infection period during the rain forecast for Friday May 10, 2019 and Saturday May 11, 2019. Rain is also forecast for the majority of next week, and could result in several infection periods. From observations made in the Annapolis Valley some blueberry varieties have reached the majority F2 bud stage, or are more advanced. Mature apothecia cups are also still present, and although some apothecia cups had started to dry up the forecasted wet conditions could slow this process.

Apothecia cups from May 9, 2019

Bud stage from May 9, 2019 


If you applied a protective spray for the infection period Tuesday May 7, 2019, you should still have control until early next week. If you did not apply a protective spray you should still be able to achieve control during the infection period this weekend by applying a spray before the rain on Friday May 10, 2019. If you are unable to get a spray on Friday you can still achieve control by applying a product with back-action capability (Topas, Mission, etc) if applied within 72 hours of the infections period. If you have already applied one of the back action products twice consecutively a non-group 3 fungicide should be used for resistance management. For more information on highbush blueberries, mummy berry disease, and fungicides please refer to Management of Mummy Berry Disease in Highbush Blueberry

As a reminder these recommendation are based off of observations made at a site in the Annapolis Valley, and may not be applicable to your specific field. The decision to spray should be based off scouting and observation made in your own field. Infection periods only occur when blueberries are at a susceptible bud stage, apothecia cups are present, and weather conditions are suitable. I will put out another update this coming Monday May 13, 2019.

Mummy Berry 2019 #4

Monday, May 6, 2019

There is potential for another infection period due to the rain forecast for Tuesday night (May 7th). From observations made Monday May 6th some varieties of blueberries plants have reached majority F2 bud stage, and apothecia cup are still present but beginning to dry up. If you applied a spray for mummy berry before the rain on Saturday, you should still have protection for this infection period depending on the product used. If you have not applied protection for mummy berry up to this point, during the day Tuesday May 7th would be an ideal time. If you are not able to get a spray on Tuesday before the rain, protection can still be achieved by using a product with back action (Topaz, Mission, etc) if applied within 72 hours of the start of the infection period. For more information on blueberries, mummy berry disease, and fungicides refer to Management of Mummy Berry Disease in Highbush Blueberry.

As a reminder the decision to spray should be based off of observations from your own field, as development and conditions can vary widely depending location and other factors. Infection period can only occur when  blueberry plants are at a susceptible bud stage, mature apothecia cups are present, and condition are conducive for disease to develop. These recommendations are based off of a location in the Annapolis Valley and may not be applicable to other sites and regions.
   

Mummy Berry 2019 #3

Thursday, May 2, 2019

From the rain forecast for this Saturday May 4th, 2019 it appears that we will have another monilinia infection period. From Observations made Thursday May 2nd in the Annapolis Valley, blueberries are still at or approaching the F2 bud stage. With the increasing temperatures over the weekend and next week, the percentage of susceptible F2 buds will quickly increase. Apothecia cups are also still present and sporulating. If you applied a spray for the previous infection period you may still have protection depending on when the application was made and the product used. If you have not applied a spray already, this Friday May 3rd would be an ideal time before the rain begins. I will put out a blog post early next week confirming whether or not there was an infection period.

As reminder the decision to spray should be based on scouting and observation made in your own field as development and weather can vary considerably between fields. For an infection period to occur blueberries have to be at a susceptible bud stage, apothecia cups have to be present, and weather conditions need to be suitable. For more information on blueberries, monilinia, or pesticides please refer to the Management of Mummy Berry Disease in Highbush Blueberry