Cerotoma trifurcata

Cerotoma trifurcata (also known as the bean leaf beetle) is a species of beetle in the Chrysomelidae family that can be found in the Eastern and West United States. Previously considered a minor pest, the past 30 years have seen an increase in population abundance. It has spread from its native region of the Mississippi Delta into the American Midwest and Canada. C. trifurcata prefers soybeans as a host, but it has been found on alfalfa, cowpea, snap beans, and cucurbits. It damages crops due to pod damage and being a vector for bean pod mottle virus. The beetle exhibits overwintering behaviors. Overwintering is associated with mating behavior and regulates when the beetle lays its eggs.

from Wikipedia