2010 map shows the distribution of counties with oak wilt disease infestations over the central and eastern US. The literature indicates a single injection treatment can protect oaks from developing symptoms for 2 years. By this method the equipment is used to cut roots to a depth of at least 4-1/2 feet along a boundary line beyond which there are only healthy oak trees unaffected by oak wilt. The treatment containers are filled with the proper fungicide and water mixture. Trees to be treated are marked with flagging tape so that the customer and our technicians can identify treatment candidates. Several species of beetles are attracted to the sap that oozes from trees infected by the oak wilt fungus, and also to sap running from fresh wounds on healthy trees caused by storm damage, construction equipment, vandalism or tree pruning. The cost of treatment is based on the diameter of the tree as measured about four feet high on the trunk. Freshly wounded trees that are growing outside of existing oak wilt centers can be visited by beetles transporting spores of the fungus. Prepare the fungicide injections per the instructions on the label from the chemical you are using. Alamo is the industry standard fungicide for the management of oak wilt and laurel wilt disease. It also works well for treatment against fungi and bacteria on trees in the white and live oak families. It starts with fall coloring out of seasonâthe leaves are wilting and browning, and within a few weeks, the tree is dead. From the Quali-Pro, Drill the first three holes at three inch intervals around tree at a 45 degree angle downward no more than 1.25 inch deep. Both wet weather and high tree density appear to accelerate disease movement. Case Study: Microinjection to Protect Trees From Oak Wilt. Our company treats several thousand trees each year with Alamo fungicide for the treatment and prevention of Oak Wilt. Alamo Fungicide can be used on golf courses, parks, residential and commercial landscapes, parkways and woodlands. Oak wilt is one of the most destructive tree diseases in the United States, and itâs on the loose, killing oak trees at nearly epidemic proportions. We have also posted a few links to some products that will refer you to other suppliers. Alamo is the industry standard fungicide for the management of oak wilt and laurel wilt disease. Most new tree infections occur when the fungus moves from an infected tree to a nearby healthy tree through connected root systems. If whole trees are removed during the critical period, the stumps should also be treated with tree paint. Pull disinfectant solution through the nozzle filling the injector several times. Successful control usually depends on an integrated program incorporating measures from all three approaches. Because Oak Wilt is spread through root grafts and insect carriers, We recommend the treatment of non-infected oaks in close proximity to the â¦ IMPORTANT: Disinfect drill bit and all Chemjets (inside and out) before using on any other tree per step 6. 5. Do not transport infected wood from oak wilt killed trees. Typical Uses for Alamo Fungicide Use Alamo Fungicide to target and manage oak wilt and laurel wilt in the red oak family. Other oak species, including White Oak, are affected to a lesser extent. It does not protect the healthy trees from infection through above ground tree wounds by the sap beetles. Disease center expansion is also dependent on weather conditions and tree population. If the tree has more than one trunk, each one is measured and the total becomes the âdiameter". After all chemical is in tree, pull injector straight out of hole. because the insects that carry spores of the pathogen are often attracted to these wounds right away. This is the only protocol with scientific data proving positive results. Once oak wilt disease becomes established in an area of oak trees, it will often continue to spread through the grafted root systems of the trees, infecting healthy oaks. Trenching can be effective for inhibiting expansion of oak wilt disease by root graft beyond a specific trench boundary. If the wood is sufficiently dried, however, spore mats will not develop. For smaller or thinner trees, a lesser dosage may be appropriate. Alamo is the flagship product with the best and most research and product manufacturing quality control measures and oak wilt is a primary pathogen and possibly the worst tree disease ever. Although trees with symptoms have a lesser chance of recovery, high value trees with special significance to the property may be selected. Such situations can lead to rapid expansion of oak wilt centers if even one tree in the group becomes infected. We recommend a trunk injection of Propizol. Infected trees in early stages of symptom expression can be treated, but their chance of recovery is poorer. It was not until the early 1980s that a fungicide containing Propiconazole (the active ingredient in AlamoÂ®) injected into symptomatic and non-symptomatic trees was found to be effective in controlling symptom expression. Nearly 100 percent success with therapeutic treatments of white oaks with up to 50 percent canopy wilt. Alamo Fungicide can be used on golf courses, parks, residential and commercial landscapes, parkways and woodlands. There are two factors that enter into the timing equation: â¶ï¸ The distance of the tree to be treated from the nearest known diseased tree. Disinfect your hands and put on new rubber gloves to avoid potential for transferring diseases to next tree. When you couple treatment timing (disease movement and treatment lifespan) with the fact healthy trees benefit more from treatment we're left with the following conclusion: The best trees to treat are those that are not symptomatic but will be challenged by the disease in the next 12 months. leaves falling off). Also disinfect any equipment used to cut or handle infected wood before moving it out of the work area. If an injector is taking chemical slowly, leave it in place and move on. The containers are pressurized to bring the mixture to the tree. The tree takes up the fungicide and water mixture. According to the USDA, in the northern USA these conditions occur in spring and summer, when spore mats are present and the beetles are flying. Whether infected by root grafts or insects, the infected trees then become the new host for the oak wilt disease, and cycle continues as the pathogen is spread to other healthy trees. To date, it is not ALSA (Propiconazole) 14.3 EC Microinjection Fungicide (Alamo) is a broad-spectrum systemic fungicide for control of selected diseases in annual and ornamental plants and use as a flare root injection for prevention and treatment of Oak Wilt, Dutch elm disease, Sycamore Anthracnose, leaf diseases of Crabapple and other tree diseases. We use a tool called an âAir Spadeâ that uses compressed air to excavate the flare roots of trees with no damage. Interconnected root systems can be disrupted with a backhoe, trencher, vibratory plow or other equipment. For large trees the interval may be shortened to 12-18 months. We've found that if the Oak Wilt threat is imminent, a treatment should happen soon to avoid major damage. Healthy oak trees can be treated using the fungicide Propiconazole 14.3 to prevent lethal infection by oak wilt disease. Using both hands, hold the Chemjet® in place and then twist and release the red plunger handle so that injection begins. We excavate the flare root area of each tree with an air spade. Oak wilt can spread from infected trees to healthy trees through root grafts between nearby oaks and by insects that carry spores of the fungus from one tree to another. The reason for pricing a treatment this way is straightforward. Only use a. Propiconazole is a systemic fungicide that will suppress Bretiziella fagacearum. No other Trees that die in summer should be removed the following winter before spring which is when new spore mats can develop. The fungus spores stick to the beetles and are spread from diseased trees to healthy trees. Treating for oak wilt is easy and relatively cheap! This causes the foliage to wilt and, frequently, tree death. However with the advent and relative simple implementation of microinjection using the inexpensive Chemjet® Tree Injector, it is much more economical for protection of many more oak trees. 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