In Europe, Sooty Bark Disease outbreaks follow hot summers. Horse chestnut ( Aesculus hippocastanum).Since 2020, Cryptostroma corticale has been confirmed on these tree species in Washington: In 2020, scientists confirmed it on trees from many areas around King and several other counties that border Puget Sound. The fungus was detected in Whitman County in 1968 and Lewis County in 2007. Where is Cryptostroma corticale in Washington? Symptoms on trees also include leaf wilting and branch dieback. Infected trees can give off large amounts of airborne spores. Sooty Bark Disease describes the mats of black fungal spores the fungus produces. The fungus primarily infects maple trees. When trees are infected by Cryptostroma corticale, it is called Sooty Bark Disease. It does not infect conifers like Douglas fir or cedars. What is Cryptostroma corticale?Ĭryptostroma corticale is a fungus associated with some broadleaf trees. It is a very rare disease, with the greatest risk for those with occupational exposures. The benefits of outdoor recreation and activities far outweigh the risks of acquiring Maple Bark Disease. Occasional and limited exposure to Cryptostroma corticale spores is not a serious disease risk for most people. The fungus does not cause an infectious disease in people - Maple Bark Disease is the reaction some people experience after exposure to the fungus. The fungus grows on maple and other broadleaf trees. Susceptible people can get Maple Bark Disease by breathing in Cryptostroma corticale spores. Chemistry lesson aside, this is one instance where the solution is quite easy and the addition of a little iron can go a long way to improving the health and appearance of the trees in your yard.Maple Bark Disease is a form of “hypersensitivity pneumonitis,” an inflammation of the airways or lungs, caused by a fungus called Cryptostroma corticale. If you have noticed these symptoms on your trees, please don’t let them go untreated. If you choose to use it as a drench, apply once a year. It adds iron to the plant, but it won’t lower the pH of your soil, so it needs to be used in conjunction with the iron sulfate for a long term solution to address the soil problem. Yet, even though it will improve the appearance of your tree, it won’t fix the problem in the soil when used alone. If you use it as a spray, apply it several times during the growing season to turn the leaves green quickly producing a “feel good” fix for the discoloration. It comes in liquid form and can be used as either a spray or a drench and each application method serves different purposes. Iron Plus is a powder that you apply a couple of times during the growing season, usually in March and July.Ĭhelated iron is my third product in the fight against iron chlorosis. This is basically the same product as the iron sulfate, but it adds some nitrogen for green growth, which is especially beneficial during the summer months. A word of caution, however: Be careful not to get it on your concrete or other surfaces because it will discolor them.Īnother product that is helpful is Iron Plus. Treat the affected tree every four to six months for best results. This helps to pull the pH down which in turn allows more iron to be available for the plant. Iron sulfate is of course sulfur which, when combined with water, turns into a weak sulfuric acid solution. Of course, the thing you are trying to do is to bring the pH down in your soil, and this can be done easily by adding iron sulfate. The good news is that this iron deficiency is easily treated using several products or a combination of them. Left unchecked, it can eventually kill your tree. This will stunt the plant even if it’s well fertilized, so if you’ve been following a fertilizer schedule, but you are seeing some of these signs, then this is probably what’s going on with your tree. As it progresses, necrosis sets in, and the leaves will actually turn black if untreated. It starts as interveinal chlorosis, which is when the area on the leaves between the veins begin to turn yellow or red. The higher the pH, the worse the condition gets. If the pH is above about 7.5-7.7, the iron gets tied up chemically and is not available to the plant, even though there still could be iron present in the soil. It’s caused by high pH in your soil, which in turn causes an iron deficiency. Since I know it’s way too early for that to happen naturally, that appearance is usually caused by a condition called iron chlorosis, and it’s easily treated.Īutumn Blaze and Hot Wings Maples seem to be affected most often, and although it usually affects maples, it can also affect other trees. One of the maple trees in my yard is looking like fall has arrived because it is already turning red.
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