Saperda carcharias

Adult beetles are 20 to 30 mm long, yellow-brown, gray or gray-yellow and have an acutely pointed elytra. It swarms in June-August. Prior to oviposition, females gnaw a vertical (occasionally oblique) incision, about 4.8 mm long, in the bark. Females deposit one egg per niche, primarily on the basal part of the stem or on exposed roots. Fresh hatched larvae stat gnaw flat galleries in phloem. Later, they bore into  wood where they gnaw an oval galleries with a diameter up to 50 cm, partially filled with rolled up, small splinters up to 20 mm in length. Larvae push the small splinters out to the base of the hostplant. The adult leaves the pupa chamber  through the oval exit hole, approximately 10 x 12 mm in size.