Mini-nucs: the basics

Synopsis : Mini-nucs are a good way to get queens mated. They are inexpensive, use few resources and are relatively straightforward to use. This post describes the basic features and use of mini-nucs for mating in miniature.

Introduction

Mini-nucs are the small hives some beekeepers use for queen mating.

Pedantically, queen rearing could be considered the generation of queen cells with – in due course – the production of virgin queens. However, it’s a rather pointless exercise if it’s not also followed – in pretty short order – by queen mating.

A queen needs the support (and probably encouragement!) of a colony of some sort while she becomes sexually mature, goes on her orientation and mating flights, packs her spermathecae and then starts laying eggs.

The hive can be anything from a full-sized double-brood colony, possibly containing over 40,000 bees, to a container no larger than two egg boxes primed with 300 ml (perhaps no more than 1000) of bees.

Kieler mini-nuc

Clearly, dedicating a full colony for queen mating (unless she is destined to stay in the same box of course) is resource-intensive and impractical. For this reason most beekeepers who rear more than a very few queens will use smaller hives for queen mating.

Even using 4-6 frame nucleus colonies for queen mating is very demanding of resources; each needs to be started with a frame or two of emerging brood and the adhering bees and a frame of stores, possibly with some additional bees shaken in on top. Getting half a dozen queens mated in these ‘full-sized’ nucs might requires ‘gutting’ two complete colonies 1.

But you don’t need to use a full-sized nuc … with care you can scale things down … a lot.

How mini is a mini-nuc?

When I started beekeeping the hive choice for queen mating was either a ‘full-size’ 5 frame nuc or the mini-nucs manufactured by Apidea or Kieler (the latter are sometimes sold as Warnholz mating hives).

Apidea mini-nuc

I’ve used Kieler’s for years. They are the only type I own … largely because they were appreciably cheaper than Apidea’s. Were and are … a Kieler costs about £22 and the Apidea is £36 2.

Since I started (which wasn’t that long ago) the choices have proliferated. There are now a plethora of plastic or polystyrene equivalents to Apidea’s or Kieler’s. Some may be better, some may be worse. Many are less expensive (at least than an Apidea).

I’m sure all can be made to work and the general principles I discuss below probably apply to the majority of these true mini-nucs (and any number of homemade equivalents). Note that both Kieler’s and Apidea’s can be extended by the addition of a second story which are really needed for overwintering queens in these small boxes. If you aspire to try that, make sure whatever make you choose is extendable.

Kieler with ‘upper storey’ added … not so mini now

In addition to these mini-nucs there are now hives that take frames about 15 cm square, or homemade versions using half-size super frames in a super divided four ways. None of these are really mini-nucs. I’ve no real experience of them and so can’t talk about their pros and cons. Friends who have them tend to rave about how good they are, but I’ve too much incompatible equipment already and can’t justify their additional cost (they can be three times the price of a Kieler).

A love-hate relationship

I have a love-hate relationship with my mini-nucs.

I love …

  • the limited resources needed to set them up. A cup full of bees, a lump of fondant and a mature queen cell gets you started.
  • their value for money. A Kieler costs less than a pretty cheap commercial queen and you can produce 2-3 mated queens in a single Kieler in one season. If you buy (or sell) queens they pay for themselves within a season.
  • the speed with which queens get mated and start laying. In my experience this is significantly less time than a 5 frame nuc, and less still than a full hive.

However, it’s not all good news. There’s a lot to dislike about mini-nucs as well, this includes …

  • the work involved in setting them up properly. I’ll discuss this further below.
  • their size and my fat fingers. The clue is in the name. Mini-nuc. Finding the queen is easy, but manipulating the frames can be a little awkward.
  • the maintenance they need. Mini-nucs are high maintenance. If you’re not careful, during a dearth of nectar they will starve, during a glut they will pack the box completely, during a cold spell they will freeze and during a heatwave they will abscond. And, if none of these things happen, they’ll get robbed out by wasps 3.

When I lecture or teach queen rearing for beginners I recommend using 5 frame nucs until you can produce good queen cells reproducibly and as needed. Then try some mini-nucs …

General principles

Whatever the make, all mini-nucs are used in broadly the same way.

The empty box contains 3-4 frames, often just consisting of a topbar and a starter strip, and a compartment for food. You can fill the latter with syrup or fondant (or damp granulated sugar). It’s worth noting that some manipulations of these little boxes may require them to be inverted at the start, so you either need to add syrup later or use fondant.

Kieler mini-nucs: four topbar frames and an integral feeder

A cup full (perhaps 250 ml to 300 ml) of bees is added to the mini-nuc and left for a few hours (at least) so that the bees realise they are terminally queenless. You then add a near-to-emergence queen cell, or run a virgin queen in through the entrance.

The mini-nuc needs to be placed in the mating apiary, not too close to queenright hives (or you can lose some of the bees added to the box). These hives are very poor at thermoregulating – there aren’t enough bees present – and they readily overheat. Therefore, place the mini-nuc in dappled shade or somewhere it doesn’t get the full strength of the sun.

Gimme shelter … an Apidea mini-nuc ‘catching a few rays’ … a recipe for absconding

The entrance is opened and 7-10 days after the queen emerges she should be mated and laying. You remove the mated queen and add another near-to-emergence queen cell … ad infinitum, or at least until the end of the season.

After removing the last mated queen of the year you shake the bees out and store the mini-nuc in the shed for the winter months.

What could be easier?

Of course, it’s not quite that straightforward …

Stocking mini-nucs

Ideally you stock a mini-nuc with young worker bees. Older workers are more likely to disappear back to the hive they came from (unless you move the mini-nuc a few miles away) and will be less good at drawing comb. Young bees are also likely to survive for long enough to rear the new brood once the queen is mated and laying.

Note that I also stated worker bees … you should avoid including drones, firstly because they contribute nothing to the functioning of the little colony, and secondly because you probably want the queen to mate with drones from outside the apiary 4.

There are lots of ways of achieving this, some more complicated than others. The best description I’ve read is by ModernBeekeeping in the instructions 5 they provided with Kieler hives.

In brief, this involves:

  • finding the queen in a strong hive and placing her somewhere safe (on a frame in a two-frame nuc, or in a cage in your pocket … she’ll be fine in either for a few hours).
  • moving the brood box to one side and placing an empty brood box on the hive floor.
  • shaking all the bees from the brood frames into the empty brood box. Work fast. The bees will try and clamber out. Give them a few sprays of water from a plant mister to help contain them 6.
  • placing a queen excluder over the bee-filled-but-otherwise-empty brood box, then putting the brood box and brood-filled frames on top of this.
  • retiring for a well-earned cup of tea.

About three hours later …

While you were drinking tea the young bees moved up through the queen excluder to tend the brood. The drones will remain below the queen excluder and a lot of the foragers should be out foraging. You’ve effectively isolated the young bees and so can now harvest them.

Each fully-covered frame has 2500-3000 bees on it … you’ll need about 1000 for each mini-nuc.

Getting them from the frames in the brood box to the mini-nuc involves the following:

  • shaking the bees off the frame into a deep, smooth sided container with curved internal corners/joints. A washing up bowl is suitable, a picnic cooler is better.
  • periodically misting the bees in the container with water. Don’t drown them. Just spray them enough to stop them crawling up the sides too much. It helps to give the container a sharp bash onto the ground every now and then to shake the bees down to the bottom again. But remember … you need live bees in your mini-nuc so treat them as gently as possible.
  • scooping up 300 ml of bees into a flexible, clear measuring container. I use a cut-down 2 litre drink bottle; prepare it in advance by adding 300 ml of water and marking where the meniscus is. That’s the volume of bees you need.

Mister and bee-measuring-scoop

  • quickly pouring the damp bees into the mini-nuc. If you’re using Kielers you do this by adding them through the removable floor with the hive inverted on the ground or table. It’s easier doing it like that than trying to add the roof – one handed, after adding the topbar frames, with bees clambering out everywhere (which can be carnage). Take my advice, fill the feeder with fondant and add the bees to an inverted Kieler.

Kieler’s ready for stocking with bees

Tidying up

The more bees you harvest from the donor hive, the less able it will be to look after the brood it contains 7. Therefore, if you’re filling several mini-nucs you will probably need to harvest the bees from multiple hives. All can be added to the same washing up bowl/picnic cooler before distributing them to the mini-nucs.

Once you have harvested sufficient young bees and populated the mini-nucs:

  • reassemble the donor hives and add back the queen. If you’ve harvested nurse bees from more than one donor, make sure you add the correct queen back to each hive! 8
  • place the mini-nucs somewhere cool and dark. I put them in the garage. Leave them closed up for 24-72 hours and mist them with water twice a day through the mesh floor panel.

Mini-nucs … populated, terminally queenless and panicking in Garrison Kieler (sorry)

Adding the queen cell and relocating to the apiary

  • add the queen cell 1-2 days before the queen is due to emerge. Apidea’s have a neat ‘port’ in the plastic crownboard through which the cell can be added. I do the same thing with a sheet of polythene on Kielers. If you’re doing this indoors (where escaping bees might be an issue for non-beekeeping members of the family) then do it at night with a red head torch. Bee can’t see red light and so won’t fly 9.
  • the following day, place the mini-nuc out in the apiary, open the entrance and let the bees fly. I tend to do this late in the afternoon.

Mini-nucs – note entrances facing in opposing directions

  • check the queen has emerged by recovering the opened queen cell a day or two later. There’s no need to look for the queen.
  • cross your fingers and wait 😉
And they're off

And they’re off …

It’s as easy as that?

Yes, in theory.

In reality though …

As with so many things to do with queen rearing, timing is very important. Typically you need to use the queen cells 10-11 days after grafting. Therefore the mini-nucs should be made up 2-3 days before that. When I lived in the Midlands, for the first round of queen rearing, this might have been in the third week of April.

Remember the proverb ‘March winds and April showers bring forth May flowers’?

In particular the ’April showers’ bit … 😉

In my experience, populating mini-nucs in the rain is probably the worst task in beekeeping.

All the bees are in the box.

They’re not happy being disturbed.

They are particularly unhappy about being unceremoniously shaken into a new box.

And, if it continues raining, they’ll be extremely resentful about being disturbed again when you return from drinking tea (and topping up your anti-histamines) to shake through the box again.

But, the queen cells will not wait.

Queen cells ready to ‘rock and roll’

If you’re going to do this for the first time, choose a really good flying day, ideally when there’s a nice flow on. The bees still won’t like being messed about with, but it will be a whole lot easier for you.

All sorts of other things can go wrong, and sometimes do. I’ve had misters block (having previously been used for syrup), I’ve tipped the picnic cooler over, I’ve put two queens back into one hive … I could go on.

It gets easier with experience and the effort is worthwhile. You’re setting up tiny little hives from which your precious queens will fly and get mated. And once established, they can be used several times without all the palaver involved in stocking them in the first place 🙂

Queen mating

It is my impression that queens tend to get mated faster from mini-nucs than they do from 5-framers, or full hives. Of course, I’ve never done a side-by-side comparison of the two 10, but I have talked to a number of experienced beekeepers who have expressed the same opinion.

Why should this be?

The consensus was that the small boxes give the queen fewer opportunities to hide, meaning that the workers can more easily chivvy her out on orientation and mating flights.

However, while re-reading Gilles Fert’s Raising Honeybee Queens (Fert, 2020) I found a comment that contradicts my experience:

American breeders have noted that queens in very small mini-nucs mate later than those from larger colonies, and with a success rate of just 60% to 70%. They found that tripling the volume of these mini-nucs boosted the success rate to 92%!

I’ll try and track the original source down … and determine whether the ’no space to hide’ and ’chivvied out by the workers’ have any basis in fact or are just the sort of daft ideas beekeepers share when stuck indoors on a wet day.

I’ve certainly not noticed a lower queen mating success using mini-nucs but, statistically, I’ve not used them enough to observe the difference between 70% and 92%.

A queen about to go on an orientation flight

Once you know the queen has emerged just leave the bees to get on with things, other than checking stores and space periodically. On good flying days, or potential queen mating days (which can be worse than you might imagine – it was 14.5°C when the photo above was taken), it’s important not to disturb the colony in case you interrupt an orientation or mating flight.

And, once you have your mated queen, you can use her for whatever you want … requeening production colonies, making up nucs for overwintering, selling or donating.

That’s all folks …

Of course, that’s nothing like all.

When I decided to write about mini-nucs I jotted down a list of interesting things to cover. Almost none of them are in the preceding 2,700 words 🙁

Typical.

That’s because I can’t cover some of the more interesting aspects of mini-nucs without covering the basics first. I’ll therefore return shortly – perhaps even next week – to this topic and waffle on about:

  • DIY modifications/improvements to Kieler’s
  • How to judge the quality of the queen
  • Repeat queen mating and ‘caretaker’ scrub queens
  • Overwintering mini-nucs
  • Emptying mini-nucs at the end of the season
  • And anything else I can think of in the intervening period.

Note

Mating in miniature is the title of a book by Bernard Möbus on queen mating in mini-nucs. It looks a little dated now (it was first published in 1983) but is an interesting read and, although the equipment has changed in the last 40 years, the principles remain much the same. I think it was published by BIBBA, but they no longer list it (and nor do Northern Bee Books). Try eBay?

References 11 

Fert, G. (2020) Raising Honeybee Queens: An illustrated guide. Deep Snow Press. ISBN 978-0-9842873-8-3

Footnotes

  1. Inevitably I’ve had to be a little imprecise here – the strength you make the nucs depends upon the time of the season, the weather, your latitude, the forage etc.
  2. Better prices may be available – I’ve not looked.
  3. OK, I’ve laid that on a bit thick, but don’t say I didn’t warn you.
  4. As always, a hive with a virgin queen will attract drones, so don’t be surprised to find some there even if you took care to exclude them.
  5. Here’s a PDF copy.
  6. They’ll still try and climb out.
  7. I usually fill no more than 3-4 mini-nucs from one hive, though this does depend upon the strength of the hive and the weather.
  8. It’s an easy mistake to make … believe me!.
  9. Wear shoes and socks though … I once did this barefoot and there were a couple of escapees that crawled out and made their presence felt.
  10. Far too scientific for me.
  11. I’m intending to standardise on this referencing format in future posts, separating the sources I cite from the daft asides I sometimes make …

18 thoughts on “Mini-nucs: the basics

  1. Peter Bound

    Hi David
    I found your article on mini nucs very interesting and informative. I have been using them for a while and the only 2 disadvantages to me are
    1/ Very difficult to assess the queen properly until placed in a nuc as there is not enough brood space available to assess laying pattern
    2/ liable to swarm very quickly if the mated queens are not removed promptly.

    Reply
    1. David Post author

      Hi Peter

      Yes, I’ve experienced both those things … I was going to touch on judging the quality of the queen in a follow-up post. If you’re short of bees, or are producing queens over a protracted period, I think they are a good investment of time and (a little) money … but if you want the easy life, use a 5 frame nuc!

      Cheers
      David

      Reply
  2. Janet L. Wilson

    Interesting blog entry, thankyou David! I wonder if someone with the book “Mating in miniature : the rationale, design and use of mininucs” might digitize it?

    Reply
    1. David Post author

      Hi Janet

      I’ve got a copy … but I’m also vaguely familiar with copyright laws which I think apply for another 2-3 decades, so I won’t be scanning mine I’m afraid 😉

      I think it’s more of historical interest than an up-to-date guide. Quite a bit of it is on the design of mating nucs (in the days when they weren’t commercially available) which isn’t really relevant these days. They do periodically appear on eBay.

      Cheers
      David

      Reply
  3. Reto

    Sounds complicated 🙂 Two frame nucs work well for me.

    To keep bees escaping from a box whilst shaking, line the inside top of the box with duct tape. It helps keeping them from exiting that way.

    Reply
    1. David Post author

      Hi Reto

      Yes, that works … to a point. You need to use very smooth tape (the textured stuff is poor) and position it about a third of the way from the upper edge … so you have time to react when and if the bees cross the tape! I’ve meant to try the thin/smooth metal foil tape, but haven’t got round to it yet.

      Alternatively – and much better – try and source some Fluon (Amazon link, but currently unavailable from there. There are alternative makes listed.). This stuff is a PTFE treatment that is more or less unclimbable by insects. It’s what Tom Seeley coated the inside of his bait hives with to demonstrate that walking around the inner walls contributed to the ability of scouts to determine the volume of the new nest site.

      Of course, if you’re organised and work fast, you can get away without these sort of tricks 😉

      Cheers
      David

      Reply
  4. Calum Grigor

    Hi David,
    300ml of bees I’d use for a mini plus or warre hive. These are an excellent size for mating and overwinter readily. Apidea gets a soup ladle of bees, but I appreciate my climate is milder in the summer. Don’t know why, but mice love to chew apideas, and their frames are awful and expensive. Oh a nice advantage of a mini plus, you can put them on a 5 frame nuc box to grow into in the spring.
    Best regards
    Calum, Lindau

    Reply
    1. David Post author

      Hi Calum

      Your comment prompted me to measure the volume of my soup ladle 😉 … 165 ml, definitely too few bees for these northern latitudes.

      I agree about the Apidea frames. A daft price. The Kieler top bars can easily be made and, once drawn, are pretty robust. There are other irritations about the Kieler mini-nucs that I’ll cover next time, but most are solvable and I’ve reared dozens of queens in them and – knowing their (and my) limitations – find them straightforward to use.

      I’m aware of some of the benefits of the mini-plus format, but – as I said – I’ve not got any and so can’t comment in an informed way. I checked the prices of these mini-plus hives. No wonder they’re popular 😉 . I think equivalent format hives (can’t be certain they’re the same) are about twice that in the UK 🙁

      Hope you’re having a good season.
      Cheers
      David

      Reply
      1. Calum Grigor

        Hi David,
        I will try to get you the plans for making miniplus from the insulation material you work so well, then the price is in pennies. We had a good year, 700kg of 12 hives, fifty colonies sold and plan to overwinter 40 colonies or so. Demand for colonies is still very good, but thinking of moving hives to Switzerland as they pay double for everything.
        Br
        Calum

        PS … miniplus
        https://youtu.be/QxZRmuflgQM
        https://youtu.be/mft3lLmOMuc
        If you paint the inside with propolis the bees don’t chew the insulation board

        Reply
        1. David Post author

          Hi Calum

          Sounds good. There’s been a striking difference between the east and west coasts. On the east it’s been a bonanza year with near record honey yields and good queen mating success rates. On the west we’ve had a shocker … almost no honey and very poor success with queens. Someone with 40 years experience of the west coast tells me it’s the worst he’s ever known (which is slightly reassuring).

          Everything is expensive in Switzerland 😉

          I’ll edit your post and add the links to the YouTube videos there – with thanks. Another project for the winter perhaps?

          Cheers
          David

          Reply
  5. Ian King

    This year I have had bad results trying to requeen my Apidea once the mated Q is removed, over 50% of my VQ’s are killed.
    Do you have any surggestions as to how to introduce a new VQ into the Apidea ?

    Reply
    1. David Post author

      Hello Ian

      I always just add a queen cell. Acceptance is then near as makes no difference 100%. When I have had to do it with VQ’s I’ve followed Albert Knight’s advice as published by Dave Cushman:

      1. Virgin queens should not be more than 3 or 4 days old before introduction.
      2. The receiving nuc should be queenless for at least 24 hours.
      3. The queen should be confined in the nuc for at least 48 hours before being liberated (you can just about squeeze a JzBz cage into a Kieler, but you might struggle with an Apidea).
      4. The mating nuc should have capped brood at the time of introduction.

      As you can see, you’re effectively treating them in much the same way as you’d requeen a full colony with a virgin queen. However, even doing this I’m not sure it’s been as successful as adding queen cells (I can’t properly remember as it’s several years since I’ve done this).

      I think I’ve read about beekeepers daubing the queen with honey and running her in the entrance, but I’ve never tried this … a recipe for a potential sticky disaster?

      Of course, there are no such problems with a newly populated mini-nuc. You can add her when you populate the mini-nuc, or run her in the entrance once they realise they are terminally queenless.

      Cheers
      David

      Reply
  6. Ian King

    Good info David and thanks, I’m thinking my big mistake was not closing the BZJZ fondant exit off for two days

    Reply
    1. David Post author

      Ah ha!

      The famous BzJz back to front queen cage 😉

      Whenever I use them – which is almost always for queen introduction – I cap them and check after 24 hours. If the bees are still showing any aggression to the queen I leave them for another 24 hours. Only once they’re just showing the ‘normal’ level of interest do I take the cap off and let them at the queen candy/fondant.

      Cheers
      David

      Reply
  7. Jeremy Quinlan

    An excellent blog – as usual!

    I’d be grateful for your steer on how best to move that mated queen in her mini-nuc into a full colony.

    Reply
    1. David Post author

      Hi Jeremy

      That’ll be in part 2, though part 2 might not be this Friday as I’d like to write about something else first …

      Cheers
      David

      Reply
  8. Patrick Walsh

    I wonder could I combine the use of mini-nucs with my Demaree’d colonies – use the queen cells generated in the upper box, and populate the mini with the young workers that are already in the upper box tending the brood… ?

    Reply
    1. David Post author

      Hello Patrick

      I don’t see why that wouldn’t work. Mini-nucs lend themselves to queen cells attached to Nicot-type bases as these can be suspended between the topbar frames even before the bees have drawn much comb. With natural cells this is more problematic. If you can cut them out with sufficient additional wax you should be able to secure them sufficiently well. Take care not to squeeze them … and remember that the cell is often much ‘deeper’ than it appears from the surface of the comb.

      Cheers
      David

      Reply

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