> Repeated experiment with 3 applications in the spring once every week yielded same efficacy (40%). 

Sounds about the same as powdered sugar dusting. If you knock 40% three times in a row, you still have 22% infestation. That doesn't count emerging bees, either, which these surface knockdowns don't touch

By the way, someone advised me that there currently is not a shortage of hops. This product was developed a few years back when warehouses were overfilled with surplus hops. Don't be surprised to see the price go up

Pete

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