However, drinking grape juice has benefits that may be just as effective ... especially purple or concord grapes, it is interesting to note that red grapes have shown the most promise.

The Florida Entomologist, Vol. 91, No. 2 (Jun., 2008), pp. 266-276 (11 pages) Volatiles from a Concord grape juice produced in Mexico were identified, tested for attractiveness, and mixed into an ...