The Snelgrove method was first described by Leonard E Snelgrove in his 1934 book, “Swarming -
The Snelgrove Method
Leonard Snelgrove’s new board was originally intended for swarm prevention (like the demaree method), where the beekeeper would judge when the bees were about ready to swarm before performing the manipulation. However, in his book, he later describes variations that would control swarming and techniques for making increase. Therefore, there is no one specific “snelgrove method”, but instead a common theme based on using a snelgrove board to manage swarming. The method described below attempts to outline the most simple use of the snelgrove board as a method of swarm control.
This method, which can be performed pre-
Although this modified method has similarities to the demaree method, unlike the latter which maintains an open structure to the hive where bees (other than the queen) can move freely between boxes, snelgrove uses the board to provide complete separation of the bees. The bees’ scent however can still pass through the entire hive via a patch of mesh in the centre of the snelgrove board.
The snelgrove board is largely based on other boards which had been around since the late 19th century. Snelgrove’s modification was to incorporate three pairs of entrances; each pair having one entrance above and one below the board. The entrances could be opened and closed in a sequence that resulted in newly flying bees being “bled” back down into the main productive hive.
The timings of the entrance manipulations are only critical where the beekeeper wishes to use the technique to raise one or more new queens.
|A Snelgrove board with 3 pairs of entrances||Each pair has an entrance above and below the board|
This method requires an additional brood box and a snelgrove board.
Keys to Success
The key to the success of the Snelgrove method are:
- Preparedness (having the necessary extra equipment ready in advance)
- Recognising the signs of imminent swarming or carrying out regular (7 day) inspection from April onward to find queen cells
- Having a marked queen to aid the finding and isolation of her
- Timing of the manipulations (if one or more new queen is desired)
Day 1 -
- Have prepared a second brood box with foundation and/or drawn comb.
- Remove the roof, supers, etc from the mother colony and find the queen (hold her in place with a marking cage to prevent losing her during subsequent manipulations).
- Place the second box on the old floor and remove a couple of frames from the centre to make a gap.
- Place the queen on a frame containing unsealed brood in the gap in the second box, ensuring there are no queen cells on this frame. Remove the marking cage, close up the gap and add a spare frame to the edge.
- Check the mother box for queen cells and (if any) remove all queen cells.
- Rebuild the hive with the queen excluder followed by the supers, snelgrove board, mother brood box, crown board and roof. Locate the snelgrove board so that the side without an entrance faces the front (same side as the main hive entrance).
- Open the top left entrance of the snelgrove board and close all others (the flying bees will return to the main entrance at the front of the hive).
Day 4 or 5-
- Without opening up the hive, close the top left and open the bottom left and top right.
Day 9 or 10 -
- Inspect the top, mother box for any queen cells which may have been created and remove all but the best ones required for developing a second colony or for making up nuclei (or remove all if no increase is sought). At this stage, the bees have no viable eggs or larvae from which to make any further queen cells.
- Close the bottom left and top right entrances and open the bottom right and rear top entrances.
At this stage the colony has been artificially swarmed and has undergone 3 lots of depletion of flying bees (the initial return of flying bees to the main entrance followed by two manipulations sending bees below the board).
What happens now depends on whether or not the beekeeper intends to make increase.
No Increase -
- Relocate the top box beneath the queen excluder to make double brood or,
- Remove the board allowing the remaining brood to emerge over the next couple of weeks. After this the top box can be removed.
If a queen has been allowed to develop and becomes successfully mated, she can used to requeen the main colony by uniting the 2 colonies. Despite their being a match of mesh between the 2 colonies allowing scent to pass through, it is still advisable to use a sheet of newspaper to unite the colonies. The doors to the snelgrove board should be left alone to allow the queen to fly.
Making Increase -
If more than one queen cell was left in the top mother box in order to make up nuclei, these will need dealing with once the queen cells have matured to the point of being sealed or almost sealed and certainly before they emerge.
The snelgrove board is useful for making increase. Although it can be used purely to prevent swarming, the separation of the mother colony from the queen often leads to the production of multiple emergency queen cells. If the bees are naturally due to swarm, then the queens raised will generally be good ones. If the procedure is performed too early in the season, the emergency cells are more likely to result in poor queens.
This method is given as guidance only. After trying one or more key methods of swarm control, the beekeeper should go on to experiment and develop their own variations to suit their own preferences.