Q. What blessing do you recite on seedless grapes? Should you avoid eating them?

A. Some Poskim maintain that on seedless grapes we do not recite “bore p’ri haetz” and also not the usual brocho achrono or the brocho of “p’ri hagefen” on the resulting wine, since seedless grapes are deemed to be unripe fruit (boser) or are regarded as a totally different species. However, most Poskim rule that they are considered normal grapes and we recite all the standard brochos on them. (Maharsham 7 quoting Daas Kedoshim, P’ri Etz Hodor Ch. 2 p. 54-62 quoting many Poskim)

Horav Shlomo Miller’s Shlit”a opinion is similar and you do not have to avoid consuming them or the wine made of them.

Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit”a