It won't be easy to separate them. I have about a half acre. Most of that is the garage and the house.Again this is not scientific at all and just what I like to use. (if I have to use something) I really try to use nothing. I isolate the sick ones and try to stop the spread before it starts. I have been lucky so far.( knocking on wood). I would rather lose a bird instead of feeding drugs to them all..
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