They usually form under a thin layer of bark or are exposed on the bark surface. The sexual fruiting bodies that look like small round flasks (perithecia) form in late summer singly or in groups up to 15 and are bright red to reddish-brown. Mimosa Webworm - This pest is the most serious problem of Honeylocusts, especially the thornless ones. They are beautiful trees. The best way to control cankers is to prevent wounds and promote tree vigor. Employment | Small drops of gum on the stem near the ground or farther up the stem usually indicate that collar rot girdling occurred below that point. Prompt removal of all infected trees reduces the chance of spreading the infection. Skyline Honeylocust Gleditsia triacanthos f. inermis 'Skyline' Plant Details: Plant Type: Deciduous Tree. Flat root systems are almost entirely near the surface. Scientific Name: Gleditsia triacanthos ‘Skycole’ This is another variety of the … Locust trees are beautiful,but are susceptible to a few diseases. OVERVIEW. Specimen or shade tree. Root collar rot, a disease caused by soil microorganisms, kills the bark and outer wood on honeylocusts at the ground line, essentially girdling the tree by a canker. The guy at the tree farm also told me that the wood on the Sunburst is much harder than the Skyline (the other one that sells a lot in my area.) A variety of stresses predispose honeylocusts to infection by canker fungi. These fungi overwinter on infected trees as vegetative material (mycelium) and fruiting structures. Root collar rot is common in urban areas in Colorado and nearby states and is responsible for the death of many of the honeylocusts killed by disease. Loose bark and discolored wood (yellow to brown instead of white) just below the bark indicate initial collar rot and are the most indicative symptoms. Midge larvae live within these galls at the ends of new growth on Honeylocust trees. In the fall their feathery foliage turns an outstanding yellow, and will require no raking because of their small leaf size. Additional: Transplants easily in spring; Pests: Over planting has encouraged severe insect problems in many areas, including honeylocust plant bug, spider mite, borer and webworm. To control canker diseases, prevent wounds and stress and promote of tree vigor. Of course no tree is perfect, but this variety is a widely used shade tree that can be found easily in our area, and we occasionally use them when one of our landscape designers determine it is a good choice for the site and meets the property owner’s needs. Usage : Parking lot island, buffer strip, sidewalk, street, specimen, reclamation. It typically grows 60-80’ (less frequently to 120’) tall with a rounded spreading crown. Honey locust—Gleditsia triacanthos Family Fabaceae (Pea family) Plant identification. Trees, insects and diseases of Canada's forests; Trees ; Broadleaf; Group 9; Gleditsia triacanthos; Honey-locust. Form. Mike Dirr in Manual of Woody Landscape Plants says it is one of the more adaptable native trees. They are generally adaptable to many climates and conditions, though the black locust is urban intolerant. Hennepin County Minnesota. Skyline Honey Locust. The reddish color associated with the center of honeylocust stems is not related to these diseases. Allow the soil at the tree base to dry out between irrigation events to prevent bark death at the soil line. Prune in cool, dry weather to minimize reinfection. The fungus grows in the bark, cambium, and outer wood, where it eventually kills the cambium and surrounding cells. Frequent watering in heavy clay soils may induce soil microorganisms to kill the bark and cambium at the tree base just below ground-line. Thyronectria canker is caused by the fungus Pleonectria austroamericana (Thyronectria austroamericana). 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