Peter Borst wrote
> Another presenter of note was Keith Deplane. He showed that coumaphos,
> fluvalinate and copper naphthalate caused significant increases in queen
> supersedure, which is a serious problem for beekeepers everywhere.
I am interested in the problems with copper naphthenate. Here in Australia
there have been no real problems that I am aware of and from my own
experience I have no problems. I wonder if it is down to the method of use.
I know from some previous published work that the concentration of copper
naphthenate used in the USA was a lot higher than I use and found necessary
for decay prevention. Also the supers (boxes) are not painted on the inside
whereas I do.
Is this paper of Keith's available or do I need to contact him directly?
Trevor Weatherhead
AUSTRALIA
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