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The black flies in the soil are probably fungus gnats, Coffee grounds aren't known to be a control, but sand and diatomaceous earth on the top of the soil are known controls, so perhaps the coffee grounds may take care of the problem. It would be interesting to know if that's the case. This site indicates that there may be problems with uncomposted grounds ...


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They are known as Fungus gnats in English. There are many tips and tricks, but like you have already noticed none of them are bullet proof. Here an example of a recent post with the same question. My own experience is that these gnats always come back, but you can keep them under control a bit. The nematode treatment, like you tried already, works very good ...


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The answer to this question depends on a number of factors. I am going on published fact sheets and research but how long Imidacloprid lasts in the environment is subject to new research frequently. The latest news is that it seems when this product is used as a flea collar that is marketed as fipronil for dogs and they go for a swim in a river that it ...


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A quick google search on Zinc Sulfate yielded this interesting page. Briefly, it's fairly innocuous in an of itself, but like many inorganic salts, too much can have environmental effects. If you have runoff into waterways, it's toxic to aquatic fauna. I don't know how much you have to use to control moss. Use according to label and you're probably okay. ...


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