Raspberries fail to mature - Ask Extension
I have a large and healthy looking raspberry patch. Earlier they were covered with blossoms and pollinators. However, the berries failed to form. What...
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Raspberries fail to mature #876174
Asked July 07, 2024, 9:25 AM EDT
I have a large and healthy looking raspberry patch. Earlier they were covered with blossoms and pollinators. However, the berries failed to form. What could cause this? What is the best way to prevent it?
Washington County Minnesota
Expert Response
Did the blossoms simply fall off, or did berries fail to develop?
We'd need sharp closeup photos of the flower stems (fruiting laterals) that produced no fruit to determine what might have gone wrong. The following sketch depicts fruiting laterals:
https://images.app.goo.gl/NrgSAZNuGaUZ5iSW6
When conditions are favorable, mold or other fungal disease sometimes affects berries at or about the time they begin to form. Desiccated remnants may be seen upon close inspection.
The following information may be useful:
https://apps.extension.umn.edu/garden/diagnose/plant/fruit/raspberry/
https://extension.umn.edu/fruit/growing-raspberries-home-garden
We'd need sharp closeup photos of the flower stems (fruiting laterals) that produced no fruit to determine what might have gone wrong. The following sketch depicts fruiting laterals:
https://images.app.goo.gl/NrgSAZNuGaUZ5iSW6
When conditions are favorable, mold or other fungal disease sometimes affects berries at or about the time they begin to form. Desiccated remnants may be seen upon close inspection.
The following information may be useful:
https://apps.extension.umn.edu/garden/diagnose/plant/fruit/raspberry/
https://extension.umn.edu/fruit/growing-raspberries-home-garden
Attached is a photo of the aborted berries
I think your suggestion that the rain may have been the culprit. The bed didn't get thinned out this year. 
On Sun, Jul 7, 2024 at 12:26 PM, Ask Extension<<personal data hidden>> wrote:
Excellent photo shows what we suspected. Thanks.
The rain after Minnesota's drought is a joy to us and our plants, but this aspect, not so much.
The rain after Minnesota's drought is a joy to us and our plants, but this aspect, not so much.
Is there a recommended treatment?
On Sun, Jul 7, 2024 at 8:50 PM, Ask Extension<<personal data hidden>> wrote:
This reply to a similar question contains the recommendations:
https://ask2.extension.org/kb/faq.php?id=198293
https://ask2.extension.org/kb/faq.php?id=198293
