Why not use food grade Diatomaceous Earth in powder form or mixed with water as a spray? It kills mites in my garden extemely well. It kills every bug extremely well also but if you are not using beneficial insects it would work and be cost effective without chemicals or extracts.
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“Enter by the narrow gate; for wide is the gate and broad is the way that leads to destruction, and there are many who go in by it. Because narrow is the gate and difficult is the way which leads to life, and there are few who find it."
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