Bronze birch borer Agrilus anxius Order Coleoptera, Family Buprestidae; metallic woodboring beetles, flatheaded borers Native pest Host plants: European and Asian species of birch ( Betula) Description: Emerging adult beetles make D-shaped exit holes in the bark. The adult birch borer beetle has an elongated, flattened body in metallic hues of green, copper, black and blue. Bronze birch borer galleries look like ridges of raised, bumpy callus tissue on the bark of infested birch. Damage to susceptible species of birch trees can be severe, often deadly. The adult is a dull metallic bronze in color and about 1/2" long. • The lumpy-bumpy ridges on the bark, “D”-shaped holes, sparse foliage and dying tops are signs of the bronze birch borer. This is an indication that the infestation is serious, as a lifecycle has been completed, and the tree is almost dead. The bronze birch borer is native to North America and in Canada is found from Newfoundland to British Columbia. Once a birch tree is infested by the bronze birch borer, control is very difficult and the chances for a cure are very slim. Symptoms/Damage. All birch species can be attacked but the two most susceptible, the European birch and the white-barked Himalayan birch, are the most widely planted in our area. Bronze birch borers normally require 2 years to complete their life cycle. The adult females begin to lay eggs on the tree trunks preferably near a wound or injury. June 15, 2019 By Drew Stevenson Leave a Comment. in boreal and north temperate forests.It is also the key pest of birch in ornamental landscapes. Bronze birch borer prefers to attack “stressed” trees because the borers are unable to survive in healthy trees. The bronze birch borer is a greenish-bronze beetle 1/4 to 1/2 inch long with a rather blunt head and a slender pointed body. On paper birch, you may see ridges but no exit holes. Bronze Birch Borer Download a PDF of this article Description. They make zigzagging galleries under the bark as they feed. Dedicated to Tree Preservation in the Urban Forest : or call (970) 484-3084: or call (970) 484-3084: Dedicated to Tree Preservation in the Urban Forest. This action restricts or blocks the movement of water and nutrients through the plant, with serious consequences, including death, for some host plants. It is possible to remove dead or infested branches and trunks. The damage caused by bronze birch borer is very visible but the insect is rarely seen. Abstract. Emerging beetles leave D-shaped exit holes in the bark. Bronze birch borer (Agrilus anxius Gory) (Coleoptera: Buprestidae), a specialist wood-borer endemic to North America, is prone to periodic outbreaks that have caused widespread mortality of birch (Betula spp.) Non-native borers like the emerald ash borer will chomp on trees no matter their health. Cynthia Orlando of the Oregon Department of Forestry discusses how to look for bronze birch borer symptoms. The adult female deposits her eggs in the cracks and crevices of susceptible birch trees in late May or June. The bronze birch borer beetle has become a serious pest in our state. Birch leafminers also turn the leaves of birch trees brown, but their damage shows up throughout the tree, not only at the top. Although the life cycle can be completed in 1 year, a 2-year life cycle is more common. The bronze birch borer has been a problem for over 25 years in eastern Washington and parts of Oregon, especially among ornamental birch species. Bronze birch borer emergence holes Bronze birch borer tunneling damage The primary way of managing bronze birch borer is by prevention. July 30, 2015 Agrilus anxious. The larvae feed through the summer, overwinter as larvae, and pupate in the cambium area in spring. Click for a free Estimate or call (970) 484-3084. Heavily attacked trees typically die from the top down. S-shaped galleries made by bronze birch borer can be seen under the bark; ⅛ inch D-shaped exit holes might be seen on trunks and branches. Bronze birch borers are a type of grub that can kill roots, branches, and entire trees. Dark-barked birches such as river birch (Betula nigra) and water birch (Betula occidentalis) are considered resistant to bronze birch borer and recommended as substitutes. Despite gardeners’ efforts to maintain deep, regular watering and fertilization, our recent hot, dry summers have allowed this wood-boring beetle to lay its eggs in the bark of a host tree. Biology Bronze birch borer adults lay their eggs May-July on the surface of bark in crevices or in niches they have chewed. Bronze Birch Borer (Agrilus anxius) is a North American insect pest that has damaged and killed tens of thousands of birch trees in Canadian landscapes. Tree Stress. Wood should be removed well below the last sign of a borer. Bronze birch borer. papyrifera is much more tolerant of bronze birch borer than B. pendula.Insects overwinter as larvae in galleries in the vascular system and resume feeding in spring as the sap rises. The bronze birch borer, Agrilus anxius, is an increasingly common pest where it occurs in Oregon. We recommend planting hardy weeping willows such as 'Lace' weeping willow (Salix babylonica) instead of birch trees. A birch infested with Bronze Birch Borer will start showing dieback in the crown, increasing in severity as the infestation continues, often leading to death of the tree. The Bronze Birch Borer (also known as the Jewel Beetle) is a tree pest that commonly affects Birches. But, healthy trees aren’t off the hook. The Bronze Birch Borer is a member of the beetle family: it bores holes into the circulatory system of the tree. They are marginally adapted to our high desert so drought stress is common. I have three birch trees in my front yard that I've been told have a bronze birch borer infestation, based primarily on the presence of numerous holes, each about 6-7 mm wide. These grubs are about 1 ¼ -inch, are cream colored and have a flat head. Bronze birch borer is a pest of birch trees, especially white barked birches such as Betula papyrifera, B. populifolia, B. pendula and B. maximowicziana.B. Native to North America, damage caused by the Bronze Birch Borer (BBB) dates back to the late 1800’s and continues to present day. Vulnerable Birch Species. The adults emerge from the tree at the end of May or in early June. Usually, native borers (like the bronze birch borer) seek out trees that are already stressed, i.e., by drought, disease, or maybe a pruning injury. D-shaped exit holes in the bark left by the adults emerging. 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