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Most lawn chemicals break down quickly and your chances of finding "proof" in the soil isn't very good. Have you googled to see if a fungus would leave any kind of residue? You can contact your local Dept of Agriculture and see.
We had a massive drought here in TN this past summer. Drought will kill a lawn or tree that isn't fully healthy but not necessarily dying. In drought conditions even normal weed control chemicals will kill a lawn that normally would do fine. I suspect that the company put down too much weed control and then your friend cut the lawn at 3. The two probably stressed it out.
My question is why are you paying big money to a company if they cannot keep your lawn looking perfect? Doesn't their products "immunize" your lawn from a fungus? If they refuse to give you any assistance I'd look elsewhere.
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Joe
See Porsche run. Run, Porsche, Run: `87 911 Carrera
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