Certified GKH Gardening Expert
This is referred to as "crumbly fruit." Occasionally raspberry canes bear crumbly berries that literally fall apart when you pick them. Viruses and other diseases, poor nutrition, weather conditions, and pesticide damage can cause crumbly fruit. Some cultivars are more susceptible to crumbly fruit than others. Keeping plants generally healthy is the best way to reduce crumbly fruit. If the problem persists, consider eliminating your raspberry plants and replanting with new nursery stock in a different location.