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Gardening - old BT in sprayer stanks like manure

shootsacanon

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I mixed up some BT a few weeks ago to spray my struggling (due to caterpillars) Brussels sprouts. Sprayed them, then left the liquid in the sprayer and hit them again this week.

I noticed when spraying, that the BT mix smells bad - like strong manure bad. Is it still safe to use, or should I mix it fresh each time and dump the leftovers?
 
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