So if you see the characteri… On Ash, especially on larger trees, the bark forms in large parallel ridges, almost like tiny parallel mountain ranges. Because of this, they’re not very adaptable when the weather dries out and they can’t get the moisture they require. These tunnels are approximately 1/8 inch wide and are packed with frass (a fine mixture of sawdust and insect excrement).. As EAB larvae feed, trees attempt to create callus tissue around larval galleries, which can cause the bark to split vertically. Ask an Expert is made up of groups and individual experts. This part of the tree will not recover for a long time, if ever. The bark did not immediately slough off, rather it took several years. You have also had some activity from what would appear to be lilac ash borer and bark beetle. The infection may girdle the stem and kill it in a single season. Splits can occur on the trunk of the tree as well as on branches. A very visible sign is canopy die back – when the upper leaves start to wither and die because they aren’t getting nourishment. There are also small holes with fine "sawdust" on the outsides of the holes, making it appear that some type of insect is boring into the tree. Or send an email? Otherwise its kind of up to you. Know where your ash trees are located and scout for the pest in June and July as the first step to prevent ash borer from causing serious or deadly damage. Lightning strikes can also fracture the bark, but that damage is usually more pronounced and easier to identify. https://extension.colostate.edu/docs/pubs/insect/05614.pdf, http://webdoc.agsci.colostate.edu/bspm/WoodBoring2017Revised.pdf. It happened about 6 weeks ago after a very cold night. Trees that are most susceptible to this type of injury are those with thin bark, such as certain fruit trees. I'll address the bark peeling first. The original word document should be attached to email response (not the ask an expert question) the Master Gardeners sent you. A mature ash tree has serious chunk of bark split off tree. S-Shaped Galleries & Splitting Bark. Other stressors like a sudden change in environment, such as trenching, removing the grass around the tree, herbicide use, over-fertilization, or the failure of your irrigation system can also end in bark shedding. However, they also can be caused by diseases or insects other than EAB. Thanks,FYI, I did not receive an answer from the county extension agent. Are you recommending that we leave the tree alone, and water, etc until we see if there is a problem with ash borer? Missing bark (or areas where bark is falling off) usually signals a dead section. Not sure if your tree is an ash? As it is an ash, and we have the threat of an incoming pest (Emerald Ash Borer). You can also examine the tree’s bark. Frost crack is distinct from sun scald and sun crack and physically differs from normal rough-bark characteristics as seen in mature oaks, pines, poplars and other tree species. Lilac ash borer generally indicates a stressed tree, bark beetle is not very problematic and will not cause large problems in the long term. Also, unlike the other borer species, they typically have two generations per year. This is the living tissue of the tree. Look for places on the tree’s trunk where there is no bark, the bark is falling off, or the bark is discolored. There is no single reason for bark splitting on trees. I would suggest a 'wait and see be lilac ash borer and feed under the bark if that becomes! On an ash tree i would suggest a 'wait and see time catch... And green ash ( on left ) and green ash ( on left ) the! Thousands of them be indicators of the larvae beneath the bark, you have further please. General tree stress, and can be 2 feet wide or wider up to the genus flowering! 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