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For removing spores off of cars oil, vinegar, car wax and tree sap remover have all worked for people that tested them. Bleach, Simple Green, toothpaste and alcohol-based mouthwash have been known to work with various rates of success, and can be tried first before attacking the spores with a scraper. After that there will still be a stain left, which can be taken care of with an ink eraser or possibly bleach. Scraping the spores off one-by-one with a scraper or steel wool is tedious but effective.
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In other cases, power-washing will be fruitless. New vinyl siding that still has an oily residue on it can be power-washed within the first week. The most important part is to get them quick, as they are covered in sticky substance that will stay on the siding for good if not taken care of in a timely fashion. As far as getting rid of the spores on your siding that's not a fun job. Generally, the key to preventing the artillery spores from ever sprouting is refreshing your mulch regularly. The larger pieces of wood will stay mostly dry and the artillery fungus won't like it as much as moist, finely ground mulch. However, if you dislike stone and still want to replace the fungus infested mulch with organic mulch, the best way to keep the shotgun fungus away is to use a course ground of wood chips or bark mulch. The only way to ensure that artillery fungus never comes back is to take out the mulch completely and replace it with stone, artificial mulch or ground-cover plants. Unfortunately, no natural mulch can resist the artillery fungus Penn State Plant Pathology department has tested 27 different kinds of mulch and found that with enough time all of the mulches were supporting the evil spore-shooting mushroom.
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Although we are not in the landscaping business we have studied this problem and this is what we have found out. This year we've had customers ask for mulch recommendations. It seems to have become a serious problem the past few years for many homeowners here in the southeast and throughout the US. The worst thing about this fungus is that it shoots spores up to 20 feet, which often land on siding, cars and anything else that surrounds the mulch. The artillery fungus, or shotgun fungus, is a wood-decay fungus that likes to live on moist landscape mulch. This is called Artillery fungus or shotgun fungus.
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