Crumbly, small, misshapen fruit can have several causes.
A common cause is tarnished plant bug feeding on flowers and developing fruit.
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Bushy dwarf virus also causes crumbly berries. A lab test is required to determine if this virus is present in a planting. Once infected, a planting will always be infected.
Tomato ringspot virus, common in older red raspberry plantings, also causes fruit to crumble when harvested.
Poor pollination and very low humidity during pollination can cause crumbly fruit. Symptoms generally do not recur the following year.
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