In a message dated 23/09/2006 19:31:27 GMT Standard Time,
[log in to unmask] writes:
The concentration of the syrup seems to be more important than that
of the acid.
That's not the impression I get from the European literature.
Paper no 122 delivered at Apimondia at Dublin covered a comparison between
different oxalic acid treatments in overwintering colonies. The test was
conducted in Italy in 2 apiaries of 50 broodless colonies randomly split into 5
groups. 3 groups were treated by trickling various concentrations of
OA/Sucrose, no 4 was treated by sublimation and the last group was left untreated as a
control.
The trickling groups were 4.2%OA/60% sugar; 3.2 OA/60%sugar; 4.4%OA/
30%sugar. Efficacy was respectively 87.7%, 87.1% and 70.3%. The authors say:" The
significantly lower motality in group C stresses the need of a high sugar
concentration in solutions intended for trickling." and " The sublimation was
time expensive and required heavier protections than the trickling."
Chris
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