Some … Symptoms begin to develop 4-6 weeks after initial infection. Dutch Elm Disease is a fatal disease which kills elms regardless of their health. It is important to note that the life cycle of the native elm bark beetle differs from that of the European bark beetle. These beetles transmit the Dutch elm disease fungus when they leave the stressed or dying tree that they hatched in and feed on crown of a healthy tree. Tree inspectors examine elm trees every summer; St. Paul requires infected trees to be removed within 20 business days of notification. While Dutch elm disease mostly affects American elms, it can hurt other elm species to one extent or another. The fungus is transmitted from tree to tree by interconnected root systems and by elm bark beetles. European elm bark beetles tend to transmit the fungus in the upper branches of the tree. Dutch elm disease (DED) is a serious disease of elms caused by the fungus Ophiostoma novo-ulmi. DED is caused by a fungus which blocks the tree’s vascular tissue; preventing it from taking up water and nutrients. The first symptom of Dutch elm disease is wilting or “flagging” in one or more of the branches, usually starting in the outer portion of the crown. Elm trees are the most susceptible to Dutch elm disease from the spring through mid-summer. Watch for the next installment of our series on the common tree diseases and insect pests in the Chicago area. The fungus that causes Dutch elm disease is transmitted by insects such as bark beetles and it causes the vascular system of the tree to clog, restricting the flow of water and nutrients. disease. Signs of Dutch Elm Disease. This process can happen all in one season or take a couple of years. The following are the main signs of Dutch elm disease. These conidia are carried in the xylem vessels where they reproduce by budding, germinate to produce mycelium, and thus spread the disease throughout the tree. Of course, if the damage is serious enough, the entire tree should be removed before it infects others. Leaves wilt, turn yellow, and ultimately turn brown. European elm bark beetles overwinter within the tree that they hatched as both adults and larvae. Beginning in late June to mid-July, look for: Flagging - when the leaves of one or more branches near the top of the tree may wilt, curl, turn yellow and then brown, remaining on the tree. Popular for their beauty and ability to grow fast and thrive in a variety of conditions, the American elm tree used to line many main streets in our country. Pathogen. Once the fungus is transmitted to the tree, it will find its way to the xylem and restrict the flow of water and nutrients through the tree. Starts with a few branches. However, a more aggressively pathogenic species Ophiostoma novo-ulmi Brasier, has displaced O. ulmi and is the cause of the current pandemic.Ophiostoma novo-ulmi is divided into a North American subspecies (O. novo-ulmi subsp. Breaking of the root grafts should take place before the infected tree is removed. At Hendricksen Tree Care, our professional arborists provide tree care and maintenance services to help protect your elm trees against diseases such as Dutch elm disease. It is a type of disease known as vascular wilt because the fungus blocks the vascular (water transport) system, causing the branches to wilt and die. These symptoms typically become visible in the late spring and beyond, but they can be visible in early spring if the tree was infected the year before without showing symptoms. The DED fungus can spread from tree to tree through root grafts. Disease can also spread through the connected root systems and by elm beetle... 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