From 2,000 to 0 Varroa In 8 Months
Background
I thought it worth posting the timeline that reduced the varroa to zero and put out a positive message that beekeepers can significantly reduce high varroa levels.
- Hive Two went from counts of 2,000 varroa in December 2013 to zero varroa by the end of July 2014
- My interventions: Open Mesh Floor (all year), Apiguard (Aug/Sep), Oxalic acid (Dec), drone culling (May)
- Bee interventions: Swarming (May) and a Supercedure (July)
- Lessons Learnt: (1) I’m not sure of accuracy of the varroa estimates; (2) be proactive and drone culling seems to be especially effective; (3) don’t worry too much if you have high varroa, because you can do something about it
The Timeline, Varroa Counts & Interventions
I use an open mesh floor and count the varroa on the board I place below. I then use the varroa calculator provided by the National Bee Unit to estimate numbers of mites in the colony.
- 24th August 2013 – Estimated number of varroa: 290
- 24th August 2013 – Added first dose of Apiguard
- 7th September 2013 – Added second dose of Apiguard
- 18th September 2013 – Discovered that Hive One had died of starvation, so removed Apiguard and fed this hive (Hive Two). Hence, colony had 25 days of Apiguard treatment – 3 days short of the ideal
- 8th December 2013: Estimated number of varroa: 2,000
- 21st December 2013: Estimated number of varroa: 1,700 (I did this as I could not believe the first count)
- 21st December 2013: Trickled oxalic acid
- 19th January 2014: Estimated number of varroa: 980 (i.e. 40% reduction; it was a mild winter so there would have been a fair amount of capped brood containing varroa)
- 15th March 2014: Estimated number of varroa: 17-140 (strange result as I had not applied any further treatment)
- 3rd May 2014: Culled drone comb (I believe this was a key intervention)
- 18th May 2014: Hive swarmed
- 24th May 2014: Estimated number of varroa: 1
- 14th June 2014: First time I saw eggs after the swarm (hence mated Queen again)
- 6th July 2014: Witnessed a Queen hatching out – confident it was supercedure
- 20th July 2014: Saw eggs – so laying Queen again
- 26th July: 2014: Estimated number of varroa: 0
- August 2014: Decided not to use Apiguard due to zero varroa
Read More
- Post: 2,000 Varroa In Hive Two
- Details: Hive Two Record Card
- A How-To Guide: Varroa Management





























