![]() It threatens some seven billion ash trees in North America. It has killed tens of millions of trees in 22 states in the United States and adjacent Ontario and Quebec in Canada. ![]() The emerald ash borer ( Agrilus planipennis), also called EAB, is a wood-boring beetle accidentally introduced to North America from eastern Asia via solid wood packing material in the late 1980s to early 1990s. Īsh is used as a food plant by the larvae of some Lepidoptera species ( butterflies and moths). Many mammalian species from meadow voles eating the seeds to white-tailed deer eating the foliage to silver-haired bats nesting will also make use of ash trees. The black ash alone supports wood ducks, wild turkey, cardinals, pine grosbeaks, cedar waxwings, and yellow-bellied sapsuckers, with habitat and food (such as the sap being of interest to the sapsucker) among others. Birds are also interested in black, green, and white ash trees. This includes the larvae of multiple long-horn beetles, as well as other insects including those in the genus Tropidosteptes, lace bugs, aphids, larvae of gall flies, and caterpillars. Īsh species native to North America also provide important habitat and food for various other creatures native to North America. They produce much less suitable food for the tadpoles, resulting in poor survival rates and small frog sizes. Species with higher leaf tannin levels (including maples and non-native ash species) are taking the place of native ash, thanks to their greater resistance to the ash borer. Lack of tannins in the American ash makes their leaves a good food source for the frogs, but also reduces its resistance to the ash borer. North American native ash tree species are a critical food source for North American frogs, as their fallen leaves are particularly suitable for tadpoles to feed upon in ponds (both temporary and permanent), large puddles, and other water bodies. Unusual "treelets" growing from a fallen ash tree in Lawthorn Wood, Ayrshire, Scotland Fraxinus hubeiensis Ch'u & Shang & Su – 湖北梣, Hubei qin.Fraxinus sieboldiana Blume – Japanese flowering ash.Fraxinus griffithii C.B.Clarke – Griffith's ash.Fraxinus profunda (Bush) Bush – pumpkin ash.Fraxinus pennsylvanica Marshall – green ash.Fraxinus pallisiae Wilmott – Pallis' ash.Fraxinus angustifolia Vahl – narrow-leaved ash.Species are arranged into sections supported by phylogenetic analysis: Section Dipetalae Both words are also used to mean " spear" in their respective languages, as the wood is good for shafts. ![]() The tree's common English name, "ash", traces back to the Old English æsc, which relates to the Proto-Indo-European for the tree, while the generic name originated in Latin from a Proto-Indo-European word for birch. Rowans or mountain ashes have leaves and buds superficially similar to those of true ashes, but belong to the unrelated genus Sorbus in the rose family. With age, ash may change their sexual function from predominantly male and hermaphrodite towards femaleness if grown as an ornamental and both sexes are present, ashes can cause a considerable litter problem with their seeds. Some Fraxinus species are dioecious, having male and female flowers on separate plants but sex in ash is expressed as a continuum between male and female individuals, dominated by unisexual trees. ![]() The seeds, popularly known as "keys" or "helicopter seeds", are a type of fruit known as a samara. The leaves are opposite (rarely in whorls of three), and mostly pinnately compound, though simple in a few species. The genus is widespread across much of Europe, Asia, and North America. It contains 45–65 species of usually medium to large trees, mostly deciduous, though a number of subtropical species are evergreen. Narrow-leafed ash ( Fraxinus angustifolia) shoot with leavesįraxinus ( / ˈ f r æ k s ɪ n ə s/), commonly called ash, is a genus of flowering plants in the olive and lilac family, Oleaceae.
0 Comments
Leave a Reply. |