Moldy Raspberry Problem - Knowledgebase Question

Bellmore, NY
Avatar for jb10000
Question by jb10000
July 2, 1999
We have 4 kinds of raspberries-red, yellow, black, and purple. The purple ones were planted 2 years ago and we are getting the first of the fruit now. The fruit appear to look almost moldy even when they are first developing. When they ripen they look half-diseased. The individual fruitlets look deflated. The plant other wise is very healthy and gets plenty of water. What is the problem and what can be done to correct it for next year? Also can it spread to the other types of raspberries?

Answer from NGA
July 2, 1999
There are several types of fungus problems that affect raspberries, some not apparent until the fruit grows although infection occurs at the flower stage. They are spread by spores (carried by wind and weather) and infection can carry over from year to year on plant debris or blow in from infected plants. It can also be spread while picking. Careful attention to fall clean up can definitely help, but the weather is also a strong contributing factor so that some years are worse than others. To verify which one has affected your plants you might wish to take a sample to your County Extension (454-0900); they should also be able to suggest control measures and timing most appropriate for your area.

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