Red pine sawfly
Larvae of this insect eat the older needles of red and jack pines. Great numbers were found in mid June on jack pine in northeastern Wadena County. Each larva has a black head and a dark green body with black stripes. During the last week in June they had grown to nearly one inch long and began dropping to the ground where they overwinter in cocoons. The next spring they change into tiny flies and lay eggs in sawed slits of needle edges. Occasionally this pest can infest large numbers of pines in plantations or forest edge locations. Chemical control is quite effective since they feed in close groups on pines.