The experiments we have done so far have been focused on bees, but not butterflies yet.
So far, with bees that have been directly sprayed with our Evictor cedar oil, there seems to be no detrimental effect.
One test had an inner cover with both bees and small hive beetles on it. The whole board was sprayed with cedar oil pesticide with both the bees and the beetles being sprayed directly.
Within a count of about 30 seconds, the small hive beetles died on the cover but the bees acted as though they had simply gotten wet from water. No dramatic dispersement, no deaths, no repelled behavior.
I am conducting more tests to see long term effect on bees and will include butterflies as they are also a beneficial pollinator and the manufacturer claims are rather large concerning them.
Early indications are that the cedar oil is not obviously detrimental to honey bees.
Cedar oil sprayed directly onto plants and allowed to dry has no effect in terms of killing or repelling honey bees. Cedar oil is not toxic, therefore no toxins are carried back to the nest should pollen have gotten covered with the cedar oil. It is not likely that pollen would “absorb” the oil anyway.
Observations made by us in flower gardens treated with cedar oil pesticide to this date have evidenced no lethal or repellent effect on honey bees or butterflies.