Copper by itself is not that effective as an antifungal. Somewhere on T-ville a university study was posted that compared the effectiveness of various anti-fungals. Copper was quite a bit more effective if combined with mancozeb. If you don't want to use that combo, I'd go with daconil instead.
What were you attacking the spider mites with? In one bed (dirt) a spray of IGR and soap worked. In another bed (containers) multiple sprays of those, plus neem, plus spinosad, plus Take down, and I"m still not keeping the red devils at bay. Evil bugs.
Dewayne Mater
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