How many times have you been asked by non-beekeepers whether bees hibernate over winter? It’s interesting that it’s such a common question. People are always amazed to learn that the colony doesn’t hibernate or die.
It’s incredible to think that right now, while a winter storm is roaring outside and I’ve turned the heating up, my bees are living in wooden boxes on a freezing field in Surrey!
We all know that our bees have a lot stacked against them in their quest for survival. Although the main preparations for winter are done in autumn, there are things we can do right now to give our bees a helping hand through winter.
Prevent winter starvation
This cluster has starved on the comb
This is one of the most critical threats our bees face over winter. Starvation happens either through running out of stores generally or through isolation starvation (when the cluster loses contact with stores and dies despite close proximity to food).
Starvation often happens in spring, when the colony is growing rapidly. However don’t wait that long to give them some fondant. I heft hives over winter, but it only makes sense if you’ve done it in autumn too and can make the comparison.
Even when I know there are enough stores, I always give them a block of fondant in early January. I put it over the feedhole in the crown board where the cluster can find it in the rising heat. It comforts me to think that if they lose contact with other stores they will probably find the fondant.
I don’t make my own fondant, I buy it. It’s better.
Remember too that its essential to remove the queen excluder in winter so that the cluster can move freely with the queen. If you didn’t do it last autumn, pick a relatively warm day and whip it off. Better late than never.
Take action on varroa during winter
Varroa feeding on larvae
What a nightmare varroa is. I have two colonies that, despite shook swarms, drone brood removal and MAQs, still went into winter with high mite drops. And now the problem requires action.
Oxalic acid is the treatment used at this time of year, now most widely done via sublimation (vaporising the crystals). It’s a good time to do it because there is less brood, so the phoretic mites are more easily knocked down.
Like starvation, varroa is something that you can’t take your eye off. I’ve been measuring the mite drop regularly over winter because I don’t want any nasty surprises in spring – I’ve had that before! Also I’d rather deal with the problem in winter while there is a good opportunity. I’d rather not put varroacides into the growing colony in spring, so better all round to do it now.
The varroa tray is also a very useful way of monitoring where the cluster is, how big it is etc. – the debris on the tray will tell you.
Too much condensation is a common winter problem which can be serious. Caused by the heat of the cluster meeting the cold surface of the hive walls or crownboard, condensation drips on the cluster and can kill a small or weak colony. I find it’s a real problem with polynucs.
The answer is simple: TOP INSULATION, BOTTOM VENTILATION. I haven’t looked back since someone helpfully pointed out that I should stop applying Ted Hooper’s methods to my open mesh floor hives! I once heard a bee inspector describe lack of top insulation as being like leaving the loft hatch open in your house so that all the heat flows out, and the ceilings grow cold.
So I now insulate the crown boards of my wooden hives with those foam quilts (I cut a hole for feeding). Floors are all open mesh for ventilation. No doubt there are other things you can use.
Polynucs get a piece of thick cardboard cut to size and inserted between crown board and roof.
The bees do use condensation in the hive for digesting winter stores but they really don’t need it dripping on them.
Bee poo: is it dysentery or nosema?
What a lovely sight
Bees get dysentery from eating fermented stores. Nosema is an adult bee disease caused by a fungal parasite. Both can show up over winter or in early spring and the visual signs are impossible to miss: squirts of bee poo on the outside of the hive – not just a few, LOTS. It’s obvious that there is a problem! Usually with nosema there’s also bee poo inside the hive, on the combs, simply because the infection gets that bad.
Nosema is diagnosed using a microscope and looks like lots of tiny grains of rice on the slide. In the UK, beekeeping associations often hold nosema clinics in the spring for you to have a sample of your bees tested. This is simple to do and well worthwhile even if you can’t see any visible signs.
There is no licensed treatment for nosema anymore so clean boxes and a comb change are needed in spring, although progress with comb changes tends to be slow because these colonies are weakened. Sometimes re-queening helps with nosema. There’s lots of info online about how to manage this. Check out the Beebase resources at www.nationalbeeunit.com.
Problems with hive or equipment failure during winter
Hives strapped for winter, with mouse guards and woodpecker netting
By this I mean the damp, leaky hive, the collapsed hive stand, etc. Hopefully you checked the condition of your hives and strapped them down in autumn. If not, you can still do it now. Sometimes replacing a roof is all that’s needed to fix damp. If hives do topple and they are strapped, your bees will probably be alright. Obviously try not to disturb the bees while you are making any necessary adjustments. I always think that I won’t need a veil when I’m checking hives in winter and the bees always tell me otherwise!
Green woodpeckers, mice and other pests
Continue to check that mouseguards remain firmly on. Strong winds and animals knocking against the hives can cause them to come loose. Boxes can also be knocked out of alignment.
It’s good to protect your hives with netting, even if you think you don’t have green woodpeckers. They can destroy hives and boxes by pecking through to eat the brood. The have a very distinct ‘swooping’ flight pattern which is a giveaway even when you can’t see the bird clearly.
When I went to check my apiary last week there was a woodpecker sitting on top of one of my hives. The first time I have seen one in five years on that site! Off I went to the hardware store for net.
Moving hives in winter
Of course one good thing about winter is that you can move hives within your apiary without recourse to the 3 feet/3 mile rule. But only after there has been a really cold snap for about two weeks and while the bees are still clustered (try not to disturb the cluster).
Those are, to me, the urgent essentials to watch when looking after your winter bees. I think observational skills are even more important in winter, simply because we can’t get inside the hive to take a look. I always take a look at how many dead bees are in the pile at the entrance, what debris is on the varroa tray and note any spots of bee poo on the outside. This takes seconds but helps in maintaining a picture of what might be going on.
Keeping your eye on a few important things can make the difference between survival and colony loss.
Happy winter beekeeping!
Today was day one of the National Honey Show here in Southeast England and it definitely delivered. I arrived early, found a seat in the lecture theatre and pretty much camped out all day. There were some good talks, but for me the highlights were the lectures by experts from the US and Canada.
The day began with a lecture by Tom Seeley. This was the first time that I had heard him speak in person. I should say that he is a hero of mine, not just because he is a truly great ‘bee scientist’, but because he clearly loves bees for the amazing and fascinating creatures that they are and he is brilliant at communicating this to ordinary beekeepers like me – whether through his books or in person. He is inspiring.
The title of his talk was ‘The Bee Colony as a Honey Factory’. This was not a talk about how to harvest more honey! Instead the emphasis was, as it always is with Tom Seeley, about the bees and their behaviour, in this case how they divide and regulate labour for efficient honey production, mobilising more foragers and also more bees to process and store food when there is a nectar flow.
Using video clips he showed us how the bees use dances to recruit help where needed: the waggle dance to recruit more foragers, shaking signals to wake up sleeping bees (yes, bees do sleep!) and tremble dances to recruit more bees to process incoming nectar.
And there are also the beep signals (like head butting with a buzzing squeak!) which bees inflict on waggle dancers to get them to stop, at times when the colony is already working at full capacity and doesn’t need more nectar.
His lecture gave us layer upon layer of insight and no doubt left many of us pondering yet again how a small creatures with tiny brains can gather and manage information within the hive to organise and direct a workforce of thousands.
I feel like I was given a glimpse into the incredible wonders and possibilities of the ‘bee universe’! I know that my bees are capable of mysterious and wonderful things, but to be shown the depth of possibilities was awe-inspiring!
In short, listening to Tom Seeley today was an absolute pleasure. He gave his talk with excellent awareness of his audience and talked about the bees in such a happy and affectionate way that it’s impossible not to feel good just by being there.
There were some other great speakers too:
Ohio-based Kim Flottum gave a light-hearted but very interesting talk about drones, a subject to which we should all pay more attention (and I include myself in that!). He showed us why drones are ‘special in so many ways’.
So often overlooked, they are of course central to the survival of our bees. As well as being a ‘gene transfer mechanism’, they are an important indicator of colony health and nutritional status.
He spoke about the need to make sure that queens mate with drones that are good genetic stock and how he has moved his bee yard close to particular drone congregation areas in order to facilitate this. He advised us to look for a combination of horizon, tree line and open area when seeking to locate our local drone congregation area.
When it comes to managing varroa, he recommended drone brood removal as an effective method of keeping the varroa population down. He has a weekly cycle of adding empty drone combs/foundation and removing sealed drone combs but warned that this must be done on a fastidious timetable before the brood hatches, or else we are just creating ‘varroa incubators’ (this is how he manages honey production hives; drone brood isn’t removed from mating hives obviously).
The last lecture of the day was given by Heather Mattila from Wellesley College. The title was “Hard Working Bees Need Pollen”. Heather’s research has shown how ‘pollen stress’ on larvae affects the performance of adult bees.
When pollen is in short supply, colonies respond by decreasing brood rearing at first, then, as the shortage progresses, by reducing the number of feeding visits that nurse bees make to larvae and by early capping of larvae. When the shortage becomes severe, bees will cannibalise larvae rather than try to feed them.
Bees that have been deprived of pollen as larvae are smaller, lighter and have a shorter life span. Interestingly, they do less foraging and are twice as likely to disappear while foraging. They also have limited hypopharyngeal gland development, and feed larvae less food, less frequently. And their dances are less precise.
A good supply of pollen is vital for the health of our bees, given that it provides almost all of a colony’s nutrients. Pollen that is stored properly in cells in the hive (processed, packed into a cell and sealed with honey) has a relatively stable nutritive value. We should make sure our colonies have plenty of it for overwintering, as pollen substitutes aren’t as good as the real thing.
Each of these speakers is giving further talks at the Honey Show over the next two days, including Tom Seeley, so head on down to Esher for some inspiration.
Is a rainstorm the best time to take a beekeeping test?
I like the wet thump of a juicy raindrop smashing into a pane of glass. Rain is natures percussionist. An afternoon in the living room listening to a performance played on my window is time well spent, add coffee and cake it’s perfect. Rainy days, I love. Unless I’m taking the assessment for the British Beekeepers Association (BBKA) Basic, which I am. Bugger.
Reading University says it’s the third wettest July since 1941. I don’t know that trudging muddy allotment path humming ‘rain rain go away’. An unlucky hive is going to be opened by me. Unlucky for the bees because bees don’t like being wet. Unlucky for me, about to put my hands in a box of 50,000 grumpy wet bees. I’m sure there are other things I could be doing on a Saturday afternoon than beekeeping the rain. I’ve been coaxed into taking the basic by my beekeeping friends. Beekeeper peer pressure is a powerful force, that’s why we lie about regular varroa checks, and it has landed me here.
But I’m in good company. The BBKA began providing formal qualifications for beekeepers shortly after it was founded in 1874. The adoption of moveable frames allowing a more standardised approach to the craft. The basic assessment I’m taking today is the very first qualification in a comprehensive system and has been taken by thousands of beekeepers before me. I’m here to prove I understand the basics of keeping bees.
The basic is gateway drug into the BBKA educational system. If I want to take another course I have to pass this assessment first, then I’m on my way to the coveted Master Beekeeper qualification; well maybe not it sounds hard work. The basic tests my knowledge and skill in the fundamentals of the beekeeping craft: equipment, handling and keeping them healthy. The assessment is practical exam – no papers – just me, bees, the assessor and his clipboard.
Tracey, my podcasting co-host and tutor hands me a cup of tea then apologises for the weather – a very British habit. We chat about the day so far and how her other students have coped with both the assessment and the conditions. She has resorted to holding a large umbrella over the hives during the assessments hoping to keep both bees and humans dry.
I’m the last candidate of the day and my assessor is standing under the gazebo erected by the association apiary team. BBKA examiners have common traits. They want you to past, are helpful, have decades of experience, but, have a steely core forged in the heat of thousands of bumbling candidates that have come before me. He suggested we complete the oral part of the test first in the hope we’ll catch a break in the rain.
The basic has both practical and oral elements. The oral test is a series of questions ranging from hive types to the diseases bees may suffer from. Confidence is important when answering the questions. I start to answer a question about swarm control by saying – some people may .. my examiner quickly interjects – no Paul I want to know what you do, not other people. If you are taking the basic next year, keep this in mind.
I breeze through the questions, the evenings spent in the study group lead by Tracey pays off. I remember the life cycle of the different casts of bee, how to spot the most common of diseases, what jobs need to be done through the beekeeping year and how to extract honey. Making a frame is one of the practical skills I needed to demonstrate and just as I hand my completed frame to my assessor the rains slow to a mild drizzle – time to crack open a hive.
When you inspect your own hives there is a certainty to what you will find after you remove the hive roof. Opening someone else’s hives is like opening a birthday present from the serious aunt when I was a kid. I hoped it would be fun, but ultimately was disappointed after tearing the corner to realise its another education book. Walking towards my nominated hive I eyed it with the same mixture of hope and suspicion.
My lucky dip hive I has two brood boxes separated by either a crown board or queen excluder. I removed the roof and placed it upside down on the floor where it would provide a handy platform to store the other hive parts. On the crown board is a simple record card. The bees are a recently hived swarm, this is good news as newly hive swarms with a laying queen – in my experience – are easy to inspect. All the time through this process I’m explaining to the assessor what I’m thinking and doing. Being very verbal seems a good idea, he asks me some questions about the parts of the hive, what I notice about the bees coming and going from the hive entrance. I crack the crown board, as I lift it there is a problem.
Fresh wild comb is beautiful, it smells lovely and has that sunset yellow colour. The top broad box has no frames and the bees dutifully built five perfect combs from the roof. I’m rather pleased with myself manoeuvring the comb and laying the crown board on the roof with no damage to the wax.
Throughout the inspection the assessor asks me questions: can you see the Queen, what’s in the cell, what is that, where are the stores. All stuff you should be thinking about when inspecting. The rain was holding off and it is going when, he points to a hole in a cell capping and asks – what’s that?
Erm … err….. erm …… that’s me bemused. I’ve seen them before and never considered the tiny holes you see at the top of the capping. Ding! My brain snaps into shape, the bees are capping the cell. And with that answer the assessment is over. After our goodbyes my examiner went home, leaving me to hang around with the association members who’d kindly given up their free time to set up the apiary for our assessments.
If you’ve been keeping bees in the UK for over a year and are a member of the BBKA I would recommend taking the basic it. Your association will run a study group and I found that it crystallised all the things I’m meant to do throughout the beekeeping and when I carry out hive checks, but, sometimes don’t.
Don’t let the practical assessment dissuade you from trying – you’ll be fine.
More information regarding BBKA educational programs can be found here: https://www.bbka.org.uk/learn/examinations__assessments
It’s the time of year that we all love . . . Whether honey is a motivation for your beekeeping or not, it’s always exciting to see those shining jars full of beautiful honey from YOUR bees. Talk about job satisfaction!
And yet a new beekeeper said to me the other day that they are ‘dreading’ their first honey extraction because they have read about how messy and disruptive it is.
There is a lot of advice written on the subject of honey extraction, ranging from the melodramatic (e.g. ‘it’s a nightmare, you’ll get honey all over your house, cat etc.’) to the overly-fussy and uptight (e.g. you can only do it with expensive kit and a specialised tool for every task).
To me the most important rule of honey extraction is: don’t mess up what the bees have perfected! They seal the honey in a pristine state and we come along and uncap it, and expose it to all kinds of spoilage risks. Our extraction methods should be designed to give the honey the best chance of staying as the bees intended!
Here are a few tips that I’ve learned through trial and error over the years.
Clearing supers: Porter bee escapes take at least 24 hours to clear supers (meaning two trips to the apiary to bring your supers home) and in my experience they can’t be relied on to clear supers completely. They also tend to break or get propolised by the bees. This year I have used Bee Quick as it clears supers almost instantly on warm days and avoids repeat trips to the apiary. It’s pretty much faff-free and that suits me!
Is it ok to extract unsealed cells?: you can extract unsealed cells as long as you check that the moisture content is not too high. You can use a refractometer to do this (they are easy to use and you can now find them relatively cheaply now) and also do the ‘shake test’ (shake the horizontal face of the comb downwards to see if any drops of watery nectar fly out). I prefer combs to be at least 70% sealed before I extract them. Remember that honey with too much water will spoil through fermentation. Honey from different floral sources can have different water contents so make sure you know what is right for yours. I know that 19% water is too much for my lavender honey to last more than 12 months (but luckily it’s never around that long).
Transporting and storing supers: remember to keep your supers and frames in clean conditions prior to extraction – don’t lay them on the ground or put them in the dirty boot of your car. This is food we’re talking about! And when you bring them home, keep them in a dry and odour-free place until you extract them which should be within 24 hours. Honey is hygroscopic (absorbs water) and can also absorb odours, which could ruin your whole extraction.
Honey extractors: the only expensive piece of equipment I use is a nine frame electric extractor which is worth its weight in gold. Every year I rent it from my local beekeeping association and it has transformed the extraction process in my house. It’s so easy to use and much more efficient at extracting every drop from the comb. Having said that, when I had just a few supers to extract my four frame manual extractor served me just fine and I still have it safely stored away. Whatever extractor you choose to suit your needs, I think this is one piece of equipment that is worth investing in.
Uncapping tools: one thing I will never use is one of those uncapping knives with the wavy edge. I bought one and used it for about 5 mins. It just seems to mash the comb. I much prefer a thinner, flexible blade. I have an old-fashioned, serrated bread knife and a carving knife which, when sharpened, does a brilliant job at getting just under the cappings and removing them in one piece. After all, you want the honey to go into the extractor, not to spill all over the uncapping tray. There are of course quicker ways to uncap. I have never tried an uncapping roller but I have seen them used and they are very speedy and efficient. Hot air guns of the paint stripper type are fine as long as you use them lightly and fast – or else they char the honey and can even cause damage to the comb.
Uncapping trays: this is where I get really low tech! You know how you sometimes get attached to a favourite thing that is old but does the job so well that you can’t find a replacement? Well, mine is a 10 year old serving tray from Ikea, with a cheesecake recipe printed on it! . . . and it is the perfect size and hygienic and just the thing for me. I once borrowed a steam-heated uncapping tray which was very efficient but it was huge, very hot and the steam peeled the paint from the ceiling of my kitchen. And it’s a very bad idea to have steam in the extraction room because honey will absorb moisture.
Tips for your extraction room: whether it’s your kitchen or another facility, your extraction room should be scrupulously clean – especially surfaces and floor. Please do remove the dog’s bed and the cat ‘s litter tray!!!!! It helps a lot to declutter surfaces and tidy everything away. The room also needs to be ‘bee tight’ i.e. keep windows and doors closed during extraction or you’ll have every bee from miles around trying to get in. It’s a good thing to keep the extraction room warm because honey ‘runs’ better when it’s warm and you’ll get a better yield. Put the oven on if necessary and put the extractor in front of it.
‘Operator Hygiene’: contrary to how this sounds, it’s not anything to do with surgery but is actually about food hygiene practices. I’m not going to go on a rant here but it should be common sense to stop your hair falling into the honey, or cigarette ash, or to not wear a fluffy woollen jumper while extracting or leave a basket of dirty laundry by the extractor! However you’d be surprised what some people think is ok. Whether you are selling your honey or giving it away, present it to the highest standards. It pays to be fastidious especially when dealing with a beautiful product.
Keep honey and water well apart: one of the most important things to remember is to keep water away from your honey. Obviously honey does naturally contain moisture but the bees manage it to ensure fermentation doesn’t take place. As soon as we remove the cappings the honey is vulnerable to absorbing too much moisture and drops of water or steam from the extracting room can spoil the whole extraction. I’t’s very easy to splash water into the extractor if its near the sink so put it elsewhere if you have room. You also have to be very careful when washing your hands – dry them properly before touching anything.
How to prevent stickiness: this really isn’t a problem or even an inconvenience. I simply start off with a clean, washed floor and lay down a sheet of newspaper on every drop of honey that falls. The newspaper can be scooped up and recycled when the extraction is over. I find that normal surface spray quickly dissolves blobs of honey on worktops, cupboard doors, doorhandles, taps etc. If you don’t like sticky hands or arms, wear disposable food gloves that fit (not ones that twist around because they’re too large) and a long-sleeved shirt.
What to do with the cappings?: if you don’t want to deal with cappings, there are methods of uncapping that deal with them for you e.g. hot air guns which melt them. I do however like to have some cappings left over. I filter mine over a bowl overnight, covered with clingfilm. I then strain this honey a second time into the main ripening tank before bottling. Some people spin cappings in muslin bags in the extractor but I’ve never tried this. It seems like a good idea. Remember that you can make mead from the water that you use when washing your extractor afterwards. You can also make it from water that you’ve use to wash the cappings. I haven’t made mead but I love the idea of nothing going to waste.
Be warned – honey is silent!! : just when you’re enjoying the sight of your hard-earned honey flowing into the filter, you turn your back for what you think is a second only to find honey overflowing down the sides of the tank and onto the floor without you hearing it. Unlike water, it doesn’t make a sound. The key moments of risk are when you have opened the tap to run honey into the wire mesh filter. It fills up very quickly especially if there is wax debris blocking the drainage; it can also happen when jarring. Don’t take your eyes off it!
Leaking honey gates: this is quite common so always test the seals before you use the equipment for the first time each year. If your honey gate is leaking it could be one of a few things. Have you taken the gate off to wash it? Make sure you put it back on the right way. The smooth side of the gate must face inwards and the grid side must face outwards. Make sure the seals are in good condition and are securely in place. Sometimes as they get older they sag and stretch, so you won’t get a good seal. Spare rubber rings should be supplied with any tap you buy but if not you can get them online.
A leaking honey gate caused by the tap being fitted wrongly: the smooth side should be inside.
Settling honey: I leave the filtered honey to ‘ripen’ for 24 hours before skimming it and running it directly into jars. Honey is vulnerable to moisture and odours while it’s settling. Now is definitely not the time to fry up some bacon! With my tank I find that if I push the lid on too firmly it’s hard to get it off again (in fact I think they used to have a label that warned they may break). So I sit the lid on top and drape a couple of clean tea towels over.
A tank of honey after settling with a white froth of air bubbles on top
Once you get it all into the ripening tank you are just 24 hours away from some beautiful jars of honey. More on the jarring process soon . . . as that’s another story.
Wishing you a sweet and successful extraction!
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Welcome to episode six of the Beehive Jive podcast.
In this show we discuss:
00:01 – 00:08: Tracey’s apiary update
00:08 – 00:17: Paul’s apiary update
00:17 – 00:37: Mite bombs
00:37 – 01:00: Queen rearing update – the trouble with mating nucs
Links to items in the show:
In the backwaters of beekeeping, a bitter debate is raging between the proponents of the so-called ‘mite-bomb’ theory and its opponents who claim it is stuff and nonsense. It isn’t the friendly sort of discussion beeks may have over tea and cake; discussing if you need matchsticks under the crown board when overwintering bees, goodness no, it is a debate with firmly entrenched opinions which each think the other side is either flat earthers or in the pocket of chemical companies.
In short, critics of those beekeepers who choose not to manage mite populations and allow them to die to say those actions kill other beekeepers’ hives. They claim varroa mites travel from the collapsing hives to nearby apiaries and overwhelm healthy hives leading to their demise as well.
This article in Bee Culture provides a more detailed narrative.
I’m not in the business of telling beekeepers how to manage their bees. So, I don’t intend to provide commentary on differing opinions on bee husbandry.
However, I do find the process of how varroa mites move from one hive to another fascinating and if you do too, read on.
The role of cuticular hydrocarbons in hives
Cuticular what now?
Insects’ cuticles, the outer layer, are coated with a layer of hydrocarbons – hence the name cuticular hydrocarbon. Its primary role is to stop the insect drying out. However, it also plays another important role in insects as a means of communication.
There is extensive research demonstrating that the chemicals signatures of these hydrocarbons play and important role in social insects’ communication mechanisms.
For example, in 2003 a study published in Nature described how researchers observed that ants could identify not only the tasks its nestmate was undertaking but also use that information to decide what task it needed to complete.
The context of honey bees you won’t be surprised to find out that forager bees have a different chemical signature that nurse bees.
How does varroa select the bees they hitch a ride on?
To understand how varroa move from a collapsing colony to a new one is it important to understand if varroa has a way to distinguish between different types of bees.
Work done by Dr Cervo and the team determined that given a choice varroa mites had a preference to attach themselves to nurse bees. From the mite’s perspective, a nurse bee will inevitably lead to new brood cell and a juicy fresh larva to raise more varroa on.
As a colony starts to collapse the population decreases to the point that the bees hydrocarbon signature becomes less distinct; resulting in phoretic varroa choosing both nurse and forager bees.
The other consequence of the declining colony population is an increased insistence of robbing.
Varroa will also readily attach themselves to these robbing bees and therefore make their way into other hives.
There is no question that mites have a mechanism that allows them to move from hive to hive, especially, if they have exploited their hosts to the point of colony collapse.
Intervention free beekeeping?
From my perspective, the real mite-bomb debate isn’t treatment or treatment free beekeeping but rather interventionless or interventionist beekeeping.
Being treatment free doesn’t mean you can’t make interventions in the colony to reduce the impact of varroa on your hives. There are plenty of bio-technical measures that can be deployed to manage mite levels within the colony which do not require chemical treatments that mimic how feral colonies are coping with varroa in the wild.
If you aren’t intervening in your colonies, even just to monitor health, you probably aren’t beekeeping.