>> 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.

Is the 40% efficacy not calculated after the series, and include all 
three treatments?

Also, the calculation of efficacy is a curious practise, with an actual 
significant positive efficacy sometimes ascribed to the controls.

That blew me a way since the controls should be the zero reference IMO, 
but apparently that is not how it is done.

Anyone care to explain?

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