It can also reproduce asexually by suckering. Common names are from state and federal lists. Similar species: • Red Ash (Fraxinus pennsylvanica) - does not grow in wet areas. This Gardenerdy article tells you about different diseases in Ash trees along with their treatment. Ash trees belong to the genus of flowering plants called Fraxinus. It’s not quite as strong or dense as the related White Ash (Fraxinus americana) ; this is most likely due to its slower growth rate, which causes a higher proportion of weaker earlywood sections. Black Ash is Minnesota's most common ash species with over 600,000,000 trees, mostly in the northern half of the state. Factors such as changes in soil and climatic conditions, insect and fungal attacks, etc., make them highly susceptible to some diseases. Although sooty mold doesn't penetrate the plant tissues, it can weaken it by blocking sunlight. The mold may cover an entire leaf surface or appear in spots, depending on the severity of the problem. Fraxinus nigra Marshall – black ash Subordinate Taxa. The bark is grey, thick and corky even on young trees, becoming scaly and fissured with age. Black ash is a medium-sized deciduous tree reaching 15–20 m (exceptionally 26 m) tall with a trunk up to 60 cm (24 inches) diameter, or exceptionally to 160 cm (63 inches). Leaf. In moist upland forest it is a tall straight tree getting over 100 feet tall and up to 30 inches in diameter at breast height. Black Ash is one of a handful of species in the Fraxinus genus that are used as commercial lumber. The winter buds are dark brown to blackish, with a velvety texture. This plant has no children Legal Status. Though it rarely attains a wide girth, this slender tree can reach heights of 90 feet (27 m) or more. Fruit (seed) Threatened and Endangered Information: This plant is listed by the U.S. federal government or a state. French names: Frène noir Family: Olive Family (Oleaceae) Group: Ashes Distinctive features: Tree; Opposite bracnhes, compund leaves, grows in wetter areas. Learning how to identify these diseases will help you manage them properly. The species is dioecious; that is, male and female flowers are borne on different trees. Sooty mold forms a gray or black coating on leaves, tender stems or flowers. Opposite on stem, length 9" to 16", pinnately compound with seven to 11 yellowish-green leaflets each 4" to 5 1/2" long, oblong in shape, and not stalked except the terminal leaflet; terminal bud is large and pointed; leaves smooth on both surfaces; turn yellow to brown in autumn. Click on a place name to get a complete protected plant list for that location. Check out our black ash leaf selection for the very best in unique or custom, handmade pieces from our shops. Flowers: Spring Leaves: Opposite/Whorled, Compound, Entire; Opposite, compound. Black ash is a slow-growing tree of northern wooded swamps. • White Ash (Fraxinus americana) - does not grow in wet areas.