ROCKPORT, Mass. (AP) — A Harvard University economics professor was charged with misdemeanor larceny and trespassing for allegedly trying to steal manure from a farm.

A stable manager, Phillip Casey, called police after finding Martin Weitzman on the farm last Friday, police said. The horse farm uses the manure as fertilizer or sells it for $35 per truckload.

Police officer Michael Marino said Weitzman also was charged with malicious destruction of property because tire marks were left by his truck.