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Lily beetles again -sorry!

I have just read on line that sunflower oil can be used but would this have to be diluted? Sprayed on?
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Cannot find anything on the dilution rate for Sunflower oil. but one person posted that they used 1 cup of oil plus 1/4 cup of liquid soap in a sprayer and top up with warm water. Shaken not stirred! No mention of the size of sprayer though.