Re: essential oil pack
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Since you are placing these in summer, not winter, small hive beetles may be a concern at your location. I'd just place one patty at a time.
The patties can be made in advance and kept in the freezer until you need them. Beekeepers usually place four or five small patties (about 2 ounces each) on the top bars and one just inside the front entrance.
-- Victor Hugo -- "Common sense is in spite of, not the result of, education.”