Interconnected root systems can be disrupted with a backhoe, trencher, vibratory plow or other equipment. Considering the rate of disease movement, trees closer than 100 feet to a diseased tree benefit the most from treatment. Do not transport infected wood from oak wilt killed trees. The cost of treatment is based on the diameter of the tree as measured about four feet high on the trunk. It does not protect the healthy trees from infection through above ground tree wounds by the sap beetles. Theme: E-shop by Themes4WP. To date, it is not Only use a. Oak wilt is a devastating exotic disease, killing some trees rapidly in a single season. Using both hands, hold the Chemjet® in place and then twist and release the red plunger handle so that injection begins. These treatments include debarking, chipping or splitting, and drying the wood. 1. Disease center expansion is also dependent on weather conditions and tree population. Oak Wilt Specialists uses Macro Flare Root Injection exclusively. If chemical starts oozing back out of open hole, replace Chemjet® and leave there for another half hour or use a. Repeat with three more holes, going around tree. The tree number is entered into our "tree tag database" that records information about the treatment and the tree. Push into place and seal (don’t twist because the nozzle may break off). Infected trees and their roots will usually die before root grafts can be reestablished. Our company treats several thousand trees each year with Alamo fungicide for the treatment and prevention of Oak Wilt. Infected trees in early stages of symptom expression can be treated, but their chance of recovery is poorer. This would generally include wearing rubber gloves and safety goggles during all mixing, injection and cleanup work. This is pretty good, when compared to a survival rate of 15% for untreated trees. We work very hard at putting ourselves in your situation when working out a treatment plan. The Texas Forest Service has utilized aerial photography to determine the expansion of Oak Wilt disease centers. The time frame between injections is 18 to 24 months. Research has shown that the effective lifespan of a treatment is about 2 years. The third approach is the injection of the fungicide propiconazole into individual, high-value trees to help reduce crown loss and extend the life of the tree. The disease reduces property values because of the loss of trees and is economically costly to the property owner since they or the local government must pay for tree removal. Propiconazole is a systemic fungicide that will suppress Bretiziella fagacearum. In fact, if the procedure is performed correctly on appropriate candidates and repeated as necessary, survival rates are 85% or better. This brings to reality an economical option of injecting, for example, all of the healthy oak trees on your woodlot around an oak wilt outbreak area to control continued expansion of the disease. It also works well for treatment against fungi and bacteria on trees in the white and live oak families. The tree takes up the fungicide and water mixture. It is caused by the fungus, Ceratocystis fagacearum, which invades the water conducting tissues (xylem) and induces the tree to clog its own vascular system, preventing the normal flow of water. Property owners sometimes have difficulty making treatment choices. 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. Covering dead wood with plastic, burying the edges for 6 months, and then air drying for a similar time will kill the fungus and any associated insects. Because open wounds create avenues for infection, damage to trees from construction, power line trimming, pruning, vandalism or storms may lead to new infection centers. Oak wilt is an important disease in urban areas where trees are highly valued. One of the greatest services we provide is the thoughtful selection of treatment candidates based on timing, aesthetics, health and budget. The disease is caused by fungus and is especially harmful to red oaks and Live Oaks. There are approximately 2 to 2.5  injection points per DBH spaced evenly around the tree. Also disinfect any equipment used to cut or handle infected wood before moving it out of the work area. Alamo Propiconazole Fungicide is a systemic fungicide used as a root flare injection for the prevention and treatment of oak wilt and Dutch elm disease. Oak Wilt is spread both aerially (via sap feeding beetles) and through root connections between trees. Available in quarts and 10-millimeter root-flare micro-injectors. While the fungicide can kill the Oak Wilt fungus, internal damage is not reversible. Many years of field application have proven that Alamo® when applied via Macro Flare Root Injection is very effective against Oak Wilt. We can guide you through the process of tree selection, timing and application of the proper treatment. After the treatment is finished, the equipment is removed and the roots are covered with mulch and soil. The treatment containers are filled with the proper fungicide and water mixture. The advancement of the disease averages 75 feet per year. For smaller or thinner trees, a lesser dosage may be appropriate. If oak wilt infects one of the trees in the stand, the disease spreads through the common root system to adjacent trees and an oak wilt infection center begins. 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. Pull the chemical mix into the injector until full at 20 ml and lock the handle back while twisting. Small holes are drilled in the flare roots and injectors are installed. IMPORTANT: Disinfect drill bit and all Chemjets (inside and out) before using on any other tree per step 6. Oak wilt is an aggressive disease that affects several species of oak trees. New infection centers can occur if the fungus is carried from an infected tree to a fresh wound on a healthy tree by insects. Adapted from the Chemjet® manufacturer suggested procedure. During dry periods, trees to be treated should be watered one or two days prior to the treatment and again a couple of days after treatment. While the best time for tree treatment may be in the spring after the new leaves have set, successful treatments can be made at any time that there are sufficient green leaves on the tree to be treated. See this Case Study. 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. Sanitation: Remove dead or diseased trees in the oak wilt center if they are not going to be treated with a systemic fungicide. Oak wilt is one of the most destructive tree diseases in the United States, and it is killing oak trees in central Texas at epidemic proportions. Nearly 100 percent success with therapeutic treatments of white oaks with up to 50 percent canopy wilt. We excavate the flare root area of each tree with an air spade. The containers are pressurized to bring the mixture to the tree. Trees that are infected with or have died from oak wilt disease should be removed and properly treated to prevent development of spore mats. Infection of healthy trees through root grafts can occur at a distance of 100 feet or more from an infected tree. 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.Root grafts. Oak Wilt Specialists of Texas – Tree Treatment for … Prepare the fungicide injections per the instructions on the label from the chemical you are using. It could take up to 24 hours. Oak wilt is an infectious disease caused by the fungus Bretziella fagacearum, which invades and disables the water-conducting system (xylem) in oaks. Inspection of your trees by a Certified Arborist on a regular basis is recommended to verify that the risk of disease has passed. A single long term soaking is preferable to several short term waterings. After the tree has finished, we remove the injection apparatus and cover the flare root area with soil and mulch. Diversity of native plant & tree species helps manage Oak Wilt which can infect a healthy tree just as easily as it can infect a tree that is not. University researchers, agriculture extension agents, the Texas Forest Service, arborists and property owners were all involved in evaluating potential pesticides. How do you treat oak wilt? We will provide a free written proposal for your injection project after we evaluate your Oak Wilt problem. If there is leakage push the nozzle in harder to seal. If you click the links provided for the linked suppliers to purchase items, we may receive a referral commission as an affiliate of the sellers at no cost to you. Fungicide Injections We use macro-injections to inject Alamo (propiconazole), a systemic fungicide, into the vascular system of the tree. Many centers expand faster or slower than the average. OAK WILT TREATMENT. Trees to be treated are marked with flagging tape so that the customer and our technicians can identify treatment candidates. If an injector is taking chemical slowly, leave it in place and move on. Pull disinfectant solution through the nozzle filling the injector several times. This is the only protocol with scientific data proving positive results. 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. Once infected a fungicide injection can suppress symptoms but is not a cure. Case Study: Microinjection to Protect Trees From Oak Wilt. Most trees that are treated preventatively don't experience a high degree of internal damage. The amount of chemical used and the amount of labor required to excavate and set up each injection point is based on the diameter. 5. Economics may prevent a "treat every tree" strategy. The fungus, Ceratocystis fagacearum, invades the water conducting tissues (xylem) and induces the tree to clog its own vessels, preventing the normal flow of water. 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. Do not inject trees during drought conditions. The oak wilt fungus moves from tree to tree in two ways: underground through the roots or overland by insects. If construction activity, tree removal, or pruning is unavoidable, or if storms injure oak trees during the critical period, the wounds should be immediately treated with a commercial tree paint or wound dressing. The treatment process takes from 2 hours to 2 days depending on tree health and weather conditions. Also there is a risk that this procedure may harm your tree, or that your tree is already diseased and the chemical injection will be of no benefit. Because Oak Wilt is spread through root grafts and insect carriers, We recommend the treatment of non-infected oaks in close proximity to the … Copyright 1999 - 2020 by Oak Wilt Specialists of Texas, all rights reserved The name Oak Wilt Specialists of Texas and our logo are registered trademarks ®. The fungicide is injected into the tree’s water-conducting vascular system through small holes drilled into the root flares at the base of the tree. Take Care of your Chemjet Tree Injectors after the work is done (or during long term work at least once per week) so they keep working smoothly by disassembling, washing all parts with hot soapy water, rinse and air dry, then lubricate the nozzle barrel and rubber plunger washer with silicone lube or vegetable oil before reassembly. We’ll help you put together a plan that makes sense for your property. For oak wilt disease prevention it is very important to avoid injury to oaks during favorable conditions for infection. The fungicide costs about $0.25 per 10 ml injector dose and Chemjets cost about $13 each and can be reused for years. We recommend a trunk injection of Propizol. Disinfect Chemjet® injector and drill bit by washing and scrubbing in diluted bleach solution or Lysol disinfectant solution. The air spade removes the soil around the roots quickly and with little or no damage to the roots themselves. Disinfect your hands and put on new rubber gloves to avoid potential for transferring diseases to next tree. The roots of trees commonly graft to roots of other trees of similar species forming a continuous underground network. 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. 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