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Agrilus anxius, the bronze birch borer, is a wood-boring buprestid beetle native to North America, more numerous in the warmer parts of the continent and rare in the north. [1] It is a serious pest on birch trees (Betula), frequently killing them. The river birch Betula nigra is the most resistant species, while other American birches are less so.
Birch dieback is a disease of birch trees that causes the branches in the crown to die off. The disease may eventually kill the tree. In an event in the Eastern United States and Canada in the 1930s and 1940s, no causal agent was found, but the wood-boring beetle, the bronze birch borer, was implicated in the severe damage and death of the tree that often followed.
Bronze birch borer is a major pest among birch species. [25] Under repeated infestation or stress to the tree from other sources, bronze birch borers may kill the tree. [25] The insect bores into the sapwood, beginning at the top of the tree and causing death of the tree crown. [26] The insect has a D-shaped emergence hole where it chews out of ...
Salem is set to remove 34 trees from Minto-Brown Island Park ahead of $1.54 million in parking lot improvements. Most of the trees — 31 non-native European white birches — need to be removed ...
Agrilus is a genus of jewel beetles, notable for having the largest number of species (about 3000) of any single genus in the animal kingdom. [3] Species of the genus have a cosmopolitan distribution on all continents except Antarctica, [4] and feed on a wide variety of flowering plant hosts. [5]
Until further study yields suggestions for the management of this pest insect, the US Forest Service advises forestry workers to use containment guidelines now in practice for the control of similar jewel beetle pests, such as the emerald ash borer and bronze birch borer. [3] If the beetle was introduced to the area, it may have come in on ...
Ten species of flatheaded borers of the family Buprestidae feed on spruce and fir, but hemlock is their preferred food source (Rose and Lindquist 1985). [3] As with roundheaded borers, most feeding occurs in dying or dead trees, or close to injuries on living trees. Damage becomes abundant only where a continuing supply of breeding material is ...
Despite this, the borers can still damage the trees if they are weakened by other means. Between about 1930 and 1950, many gray birch trees, along with paper birch and yellow birch (Betula alleghaniensis), were weakened by birch dieback disease, which allowed for the bronze birch borer to attack and kill the trees. [11]