The showy Sugar Maple Borer adult gives rise to pesky larvae that cause all kinds of stress to trees, tappers, and the lumber industry.
The yellow markings on the Sugar Maple Borer are hard to miss. Starting by the rear end, the black wing coverings look like they were dipped in bright yellow paint. A single black dot in the center may or may not have a black band above it. A curved yellow line crosses the elytra (wing coverings) near the middle of the wings like a loose belt. A 'W'-shaped yellow line zig-zags across the upper elytra, near the 'shoulders', and it is filled with two angled yellow lines on each side. If its head and thorax are bent down, three yellow dots are visible where the 'neck' and top of the wings connect. The thorax has a black center with two yellow lines on each side. A yellow band sits at the bottom of the head, and more yellow may fill in between the eyes. The long, segmented antennae are black. Legs are yellow with brownish feet.
Once the adult beetle is identified, it is worth the time to examine the maple trees nearby. Strange marks and bulges in a tree's bark can indicate the presence of young beetle grubs and pupae inside the tree. The Sugar Maple Borer lays fertilized eggs on the the Sugar Maple Tree. The tiny, wormy larvae burrow into the sapwood of the tree and tunnel their way round. Adult beetles emerge in two years, leaving plenty of time for exploration and feeding. In the process of moving throughout the wood, larvae cut off vascular tissue that allows the tree to move water and nutrients up and down. Sometimes larvae move horizontally across the trunk, causing the tree to have raised scars that look like smiles. Larvae can grow up to 5 cm long (almost 2 inches) and cause wood discoloration and decay inside the wood. They also dig deeper into the wood just before winter, creating 'J'-shaped tunnels and twisted grain. These defects render the lumber less valuable for use (flooring, cabinetry, furniture). The disruption in water and nutrient flow can negatively affect sap production, too. Native Americans taught early colonists how to identify and tap into the sugar maple tree's vascular tissue in order to collect some of its sap. Today, the boiled sap, or syrup is a billion-dollar industry. Maple syrup production relies on this tree species. Though this beetle has not devastated forests of maple trees, its negative handiwork makes it a pest. Forestry management strategies to control its population size are implemented in the northeastern states and provinces where the maple syrup production thrives. Removing heavily infested trees before summer and pruning infested limbs helps curb beetle population growth. Inserting thin wire into larval holes to kill them also helps reduce the amount of damage done inside trees.
Sugar maple trees are the only species that the Sugar Maple Borer uses as a host plant. Learning to recognize that particular maple tree along with this particular beetle gives insight into what it happening in that forested area. There are other black and yellow borers that look similar to this one, but they do not use the sugar maple tree. There are a variety of types of maple trees, but they are not used by this beetle. The relationship between this beetle and the sugar maple is exclusive.
Scientific Name: Glycobius speciosus
Size (Adult; Length): 23mm to 27mm (0.90in to 1.05in)
Colors: black, yellow
Descriptors: W, V, lines, zig-zag, bee, flying, pest, tree scar
Note: An insect's reach is not limited by lines drawn on a map and therefore species may appear in areas, regions and/or states beyond those listed above as they are driven by environmental factors (such as climate change), available food supplies and mating patterns. Grayed-out selections indicate that the subject in question has not been reported in that particular territory. U.S. states and Canadian provinces / territories are clickable to their respective bug listings.
Antennae: Beetles have a pair of antennae on the head used as sensors.
Head: The head is home to the insect's eyes, antennae, and mandibles (jaws).
Thorax: Holds the three pairs of legs as well as vital internal organs.
Elytron: One of two wing cases on a Beetle that protects its wings (plural: elytra).
Wings: Appendages used for flying and kept under the elytra until needed.
Abdomen: Houses organs related to circulation, reproduction, and excretion.
Legs: Beetles have three pairs of legs located at the thorax, numbering six legs in all.