Dick Marron wrote:
> Treated all by sublimating O/A.
> Harvested honey in July. Mite drops low. 0 to 20 per day. Went hunting etc
> and came back in late sept. No more crop and mite counts too high. 20 to 
> 50
> a day. Treated the same way and again in a few weeks.

Is the problem here simply excessive use of oxalic acid - and using it at 
the wrong time of year?  The general advice seems to be no more than 1 
treatment per year and when the colony is broodless (or as near broodless as 
possible).  We know that oxalic will both damage brood and suppress brood 
rearing.

Best wishes

Peter Edwards
[log in to unmask]
www.stratford-upon-avon.freeserve.co.uk/

******************************************************
* Full guidelines for BEE-L posting are at:          *
* http://www.honeybeeworld.com/bee-l/guidelines.htm  *
******************************************************