Re: Canola

[Canola in Europe is called by its real name: oilseed rape]

1.	Between oilseed rape sites and non-oilseed rape sites no differences were found for colony losses neither for the overwintering quotient (= colony strength in autumn divided by colony strength in spring). 

2.	Highly significant correlations were found between winter losses and the Varroa infestation levels in autumn. The risk for colony loss increases with the number of mites in the colony in autumn.

3.	Similarly the correlations between the infection with ABPV and DWV in autumn and winter losses were significant.

4.	No significant correlations were found for Nosema sp. infections. 

5.	Surprisingly, the age of the queen was significantly correlated with the winter losses. Young queens
were more successful. Not surprisingly, the strength of the colony in autumn is significantly correlated
with the winter losses. The risk of winter losses decreases with the strength of the colony in autumn. 

6.	No significant effects were found for the type of syrup used for feeding before wintering, for the type
of boxes (wood/plastic), for the size of frames or young colony/old colony.

Periodical honey bee colony losses in Germany: preliminary results from a four years monitoring project. Martina Janke
in: Hazards of pesticides to bees – 10th International Symposium of the ICP-Bee Protection Group

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