> And you were assuming that all remaining mites each time were resistant?

Yes, but they do not produce any more resistant mites (too hard to do
much else). Instead, that number survives into the next year and so
on.

Very simplistic. The main factor was going with a lesser treatment
which gives only a 1% difference in kill and how it makes a fairly
large difference if you assume survivors are resistant.

Bill Truesdell
Bath, Maine

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