Integrated Varroa Management

Measurement of Varroa Mite Levels.

Varroa infestations are often missed by beekeepers until the infestation is severe. It is therefore important

to regularly monitor for the pest and to be able to assess when the infestation is likely to have an impact on

the colony. It can thus be seen that the key to successful varroa control is knowing how many mites are present

in a colony and when to take appropriate action. This sheet explains how to calculate varroa populations.

The sheet ‘Varroa Treatment Thresholds’ advises on when to take action.

There are two accurate methods. Both require some time so a quick assessment method has been included at

the end of this sheet. You must remember that the ‘quick guide’ is not an accurate assessment.

Method 1.

Natural Mite Mortality.

The number of mites recovered from floor debris can give an indication of the mite population.

The system is accurate in the winter and summer hut during March, April, September and October

the results are less accurate.

To use this method

I) Use a varroa screen floor or a tray fitted with mesh screen.

2) During summer collect debris for at least 7 days.

3) During winter collect debris for a longer period.

4) No treatment should be carried out during the sampling period.

5) Collect the debris and count the number of mites. Divide this figure by the number of days the sample

was taken over and you have a daily mite fall figure.

6) Multiply the daily mite fall figure by one of the following

Winter i.e. November to February x400

Summer i.e. May to August x30

March. April. September and October x100*

*Remember this result will be approximate only.