My understanding was similar, but my experience tells me something else is going on. For example, If I am wearing my permethrin treated hat, bugs aren't bothering me, but when I take it off, they are all over my face. No other bug spray is being used. So I am not sure that there isn't a deterrent effect as well.
The treatment on my net creates a no-fly zone. At the Big Thicket last summer, others commented on the night long whine, but I never heard a thing.
Dave
"Loneliness is the poverty of self; solitude is the richness of self."~~~May Sarton
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