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The emerald ash borer (Agrilus planipennis), also known by the acronym EAB, is a green buprestid or jewel beetle native to north-eastern Asia that feeds on ash species (Fraxinus spp.). Females lay eggs in bark crevices on ash trees, and larvae feed underneath the bark of ash trees to emerge as adults in one to two years.
Hymenoscyphus fraxineus is an ascomycete fungus that causes ash dieback, a chronic fungal disease of ash trees in Europe characterised by leaf loss and crown dieback in infected trees. The fungus was first scientifically described in 2006 under the name Chalara fraxinea. Four years later it was discovered that Chalara fraxinea is the asexual ...
The bugs have killed millions of ash tress across the country, and all 16 species of the tree are susceptible to attack, according to the Texas A&M Forest Service.
In areas where ash borers are present and causing damage, insecticides can be applied to the trunk and branches before larvae chew into the bark. However, insecticides, are not effective once larvae are inside the tree. Even systemic insecticides that are incorporated by the tree that are normally effective for other wood-boring insects are not ...
Within the ash populations that were sampled, 50% of the trees had crown die-back of 10% or more caused by ash yellows. [19] In a different study that looked at the annual increase of ash yellows in six populations of white ash in New York , the average annual increase in disease incidence was found to be 4.5%. [ 20 ]
It is a pest to green or red ash and white ash trees although any species of ash is vulnerable; female insects lay groups of eggs in slits in the leaflets of emerging leaves in late spring. [1] [2] [3] The larvae are greenish or yellow-white, and they grow to between 14 and 20 mm (0.6 and 0.8 in) long. [4]
The red-headed ash borer usually develops in recently dead or dying hardwood trees, so the most common impact on humans is damage to felled trees intended for hardwood lumber or firewood. These insects are commonly brought into homes with firewood and may emerge, but do no physical damage to the home. This species has been known to infest weak ...
Neoclytus caprea. (Say, 1824) Neoclytus caprea (commonly called the banded ash borer) is a species of beetle in the family Cerambycidae. It was described by Say in 1824. [1] It feeds on sapwood of ash, sometimes oak, and hickory. It often emerges indoors from firewood; logs may become infested within 20 days of felling during summer.