I've gotten even better results when I mix the oil (hort or neem) with warm water from my faucet as opposed to cold from the hose spigot. I recon that the heat "softens" the oil and acts as a catalyst for the emulsifiers contained in some of them. To me, a warm mix just seems to cover better.
This time of year, there's two things that should be considered before applying oil to those trees that will remain out of doors during the winter:
1) Oils or oil based products applied after September* may reduce soluble solids in the fruit of the trees to which it is applied.
and
2) Oils or oil based products applied after October* may reduce the cold hardiness of the trees to which it is applied.
*These dates pertain to my region and would undoubtedly change in a different climate. Regardless of climate, it's a good idea to abstain from applying oil 60-90days prior to freezing temps.
If in your estimation it's too late in the year to manage mites with oil or oil based products, you may want to default to soapy water or one of the other available chemical controls such as Avid.
Best,
Skinn30a
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Zone: Border of 9a/8b
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"but do please, Br'er Fox, don't fling me in dat brier-patch"