Minnesota's first gypsy moth infestation of the season has hit trees apparently shipped from the East Coast. Evidence of the moths appeared in nursery trees in St. Paul and St. Cloud, and at a housing development in Blaine. The gypsy moth, originally brought to the western hemisphere to help the silk industry, is considered the United States' number one tree pest. Geir Friisoe is the manager of the plant protection programs at the Minnesota Department of Agriculture. He says, in a normal year, the department will find one nursery with one or two of the months. This year is different.