>> 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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