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black spots turn to black rot Black spots on Catasinae
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  #11  
Old 10-11-2010, 04:47 AM
Lars Kurth Lars Kurth is offline
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Black spots on Catasinae
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Is it better a sulphur or copper based fungicide? in NYC I only seen these 2 by Bonide. Many products can not be legally be sold in NYC.
Sulphur based fungicides are not systemic: they work similar to cinammon. Copper based are not either and can create damage on some orchids.
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  #12  
Old 10-11-2010, 03:27 PM
stefpix stefpix is offline
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Thanks.

What is a name/brand for a systemic fungicide? is it good for prevention? Is it toxic?
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