Needle and twig midges—Contarinia spp.
Adults are tiny, delicate, mosquitolike flies. Midge larvae are white. They are found in swollen needles.
Adults emerge from pupae in soil.
Needle and twig midges cause swollen and galled needles. Needles may drop and twigs may die back.
Needle and twig midges apparently do not
harm trees. Prune out damaged shoots. Spraying for midges
generally is not warranted in landscapes.
Swollen Douglas fir needles