There are several red and black true bug nymphs, but with that lighter colored spot on the abdomen, I'd guess that it's the nymph of Boisea trivittata, Boxelder Bug.

They are maple seed eaters, often associated with boxelder trees but will feed freely on any kind of maple. They gather in huge hoards.

To clarify....boxelder bugs only feed on the seeds of maples, not any other parts. I would not consider them anything but a nuisance therefore not requiring any chemical control measures.