What is Ash tree?
[[Image:Fraxinus-angustifolia.jpg|thumb|right|An ash tree in [[London]]]] '''Ash trees''' are medium to large [[tree]]s of the genus '''''Fraxinus''''' of the family [[Oleaceae]] (Olive-tree like). The family contains between 45 and 65 [[species]]. Some of them are evergreen, but most are [[deciduous]]. They grow in most parts of the world. The [[seed]]s are commonly known as ''keys'' in [[English language|English]]. They are a type of [[fruit]] known as a [[samara (fruit)|samara]]. Most of the ash species have light-green, oval shaped, [[:en:Leaf shape|pinnate]] leaves. The central stem of the compound leaf has 9 – 13 leaflets (small leaves) in pairs, with one at the tip. There are no stalks to the side leaflets. The leaflets are pointed and toothed, with hairs on the lower surface. The leaves appear relatively late in spring, and are amongst the first to be shed in autumn. The buds are black, sooty or velvety in appearance and are sometimes compared to a Bishop’s Mitre in shape. Ash wood is used to make various [[tool]]s, [[Handle (grip)|handles]], baseball and softball bats and [[Bow (weapon)|bows]]. It also makes very good [[firewood]]. Ash trees are also perfect material for old fashion shafts for bow and arrows. In [[Norse Mythology]], the world tree [[Yggdrasil]] is commonly thought to be an ash tree. The first [[man]], Askr, was formed from an ash. The first [[woman]] was made from an [[alder]]. ==Threats== [[File:Agrilus planipennis 001.jpg|thumb|right|upright=0.55|Emerald ash borer]] The [[emerald ash borer]] (''Agrilus planipennis'') is a wood-boring [[beetle]]. It was accidentally introduced to North America from Asia by solid wood packing material in the late 1980s. It has killed tens of millions of trees in 15 states in the [[United States]] and adjacent [[Ontario]] in Canada. Research is being done with three Asian wasps which are natural predators of the beetle [[Biological pest control|biological control]].<ref>{{cite web|title=The Problem|url=http://www.dontmovefirewood.org/the-problem.ht