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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 ...
European ash in flower Narrow-leafed ash (Fraxinus angustifolia) shoot with leaves. Fraxinus (/ ˈ f r æ k s ɪ n ə s /), commonly called ash, is a genus of plants in the olive and lilac family, Oleaceae, [4] and comprises 45–65 species of usually medium-to-large trees, most of which are deciduous trees, although some subtropical species are evergreen trees.
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.
Description. Fraxinus pennsylvanica is a medium-sized deciduous tree reaching 12–25 metres (39–82 feet) (rarely to 45 m or 148 ft) tall with a trunk up to 60 centimetres (24 inches) in diameter. The bark is smooth and gray on young trees, becoming thick and fissured with age. The winter buds are reddish-brown, with a velvety texture.
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 ]
Fraxinus americana, the white ash or American ash, is a fast-growing species of ash tree native to eastern and central North America. The species is native to mesophytic hardwood forests from Nova Scotia west to Minnesota , south to northern Florida , and southwest to eastern Texas .
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]