Life History of an Oak Twig Girdler, Agrilus arcuatus, Say, and var. torquatus, Lec

Ruggles, A.G.

17th Report of the Minnesota State Entomologist, Agriculture Experimental Station University Farm, St. Paul, December 1st.: 15-20


Local damage to oak trees is recorded in Minnesota, due to a small Buprestid larva identified as Agrilus arcuatus, Say, var. torquatus, Lec., which burrows beneath the bark at the tip of the twigs. A similar species, A. bilineatus, Web., infests the same species of oaks, particularly Quercus rubra, L., and attacks the trunk and larger limbs, while A. arcuatus works downward, often cutting off branches 8 feet long. The adults appear throughout July.