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Cleaning Beehive Frames and Equipment
There is lots of good advice available for beekeepers. Good, but not always very practical or workable. When I did my beginner’s course, I remember distinctly one of the instructors pointing at a small pile of old frames and wax and stating: That’s what you should do with old frames. They went on to say that as it only costs a few Euros for a new frame and wax foundation. Anyone would be mad not to burn the old and replace with new. They said there is no point in cleaning beehive frames. You will get hardly any wax from it and the frames are a nuisance to clean. Plus, they make darn good kindling.
How Best NOT to Follow Good Advice
It sounded like good advice at the time and made perfectly good sense. That is, it made perfectly good sense until I became a beekeeper myself. Then I learned that if there is one thing that beekeepers hate more than malfunctioning clearing boards and drone laying queens, it is spending money. I do not know if we are a particularly mean bunch, but I think it is fair to say that if we can put in a few hours of elbow-grease, and a large helping of blood, sweat and tears instead of parting with our hard-earned cash, then we will.
Whereas the recommendation to burn old frames still makes perfectly good sense. (It will save both time and energy, and, more importantly, reduce the risk of spreading pests and diseases). It largely falls on deaf ears. However sound the advice, most beekeepers I know do not follow it. We opt instead to reuse old frames and replace only those that are broken or otherwise unusable. If you practice comb renewal on a yearly basis or even every two or three years, replacing all frames with new is not economically justifiable for most beekeepers. Hence, in this blogpost I will offer some guidance on how best NOT to follow good advice. We will look at how to reuse old frames, and how to clean and sanitise them so that they are good for future use. I will also briefly discuss ways of cleaning, sterilising and disinfecting other hive equipment.
Pests, diseases & second-hand equipment
Clean frames and comb are nicer to use than old, dirty ones. But that is not the reason we should endeavour to keep our frames clean and the comb fresh. Both frames and comb, as well as other hive equipment, can harbour a wide range of organisms known to negatively impact honeybees. Anything from insects and fungi to mites and bacteria, including Paenibacillus larvae and Melissococcus plutonius, which cause American and European Foulbrood respectively.
The spores from P. larvae can survive in or on equipment, comb, and honey for many years. Therefore, when American Foulbrood is detected, all bees and equipment should be destroyed. This is done through burning and the remains of the fire buried. M. plutonius is non-spore forming but the bacteria can remain on frames and combs for some time and has the potential to reinfect another colony if the frames are reused without first sterilising them and then replacing the wax.
Before moving on to cleaning beehive frames and equipment, I would like to issue a little word of warning in relation to purchasing and using second-hand equipment. Sometimes our eagerness to save a few bob can have devastating effects on our bees. Never buy or use second-hand equipment from unknown sources, as you have no idea what you are getting. If someone is selling or giving away equipment because the colony died, just walk away. If you are set on acquiring second-hand equipment, you need to know why the seller is selling. You must make sure that the bees that were in them did not die out, and you need to sterilise the equipment thoroughly and replace all wax. If you cannot do this or are not prepared to, it is not worth the risk. Just buy new equipment instead.
Sterilising, disinfecting & cleaning beehive frames and equipment
There are many different methods that can be used to sterilise, disinfect, and clean beekeeping equipment. Some are suitable only for particular types of equipment and some will work on certain pests and pathogens. Some will leave the equipment squeaky clean but offer little in terms of sanitation, whereas other methods will sterilise or disinfect but not thoroughly clean it. Many methods involve using chemicals that are toxic, corrosive, and dangerous. Whichever you choose to use, make sure that you familiarise yourself with the products and equipment you are going to use, read any manufacturer instructions carefully and make sure to use appropriate protective clothing and dispose of the waste appropriately.
Steam
Steam is suitable for melting wax out of frames, cleaning frames and to clean timber boxes internally. It is also effective for use against insects, mites, and fungi, but will not eliminate American Foulbrood spores or the bacteria causing European Foulbrood. You can easily and cheaply build a steam cleaner/wax extractor with a wallpaper steamer, a timber brood box, a roof or crown board with a hole for the steam pipe, and a floor with collection tray and a mesh to filter the debris from the wax. Commercial steamers are also available. After steam cleaning, frames will usually require a certain degree of manual cleaning to remove residual wax and propolis.
Blowtorch
A blowtorch is suitable for cleaning timber boxes internally although special care needs to be taken to remove frame runners and scorching the internal corners and cavities. It can also be used on frames but is quite time consuming. It is effective against insects, mites, fungi, and to a large degree in sterilising boxes post-European Foulbrood. Remove all wax and propolis prior to using the blowtorch and use the tip of the blue flame on all timber turning it into a darker shade of brown, but without burning it.
Bleach
Bleach (Sodium hypochlorite) is used effectively for cleaning polystyrene hives and plastic components such as apidea frames, queen cages, feeders, etc. as well as hive tools. Equipment should be soaked in a 0.5% solution (Sodium hypochlorite and water) for at least 20 minutes and then rinsed and aired before use. Soak polystyrene hives overnight. Timber hive parts can also be submerged in the solution. Any residual wax and propolis will need to be scraped or scrubbed off after immersion.
Sodium hypochlorite is also one of very few substances that can kill the dreaded spores from American Foulbrood. As the disease is so serious, it is classed as a notifiable disease, all equipment that has been used for a colony which has tested positive for it, needs to be burned. Hence, sodium hypochlorite or bleach should not be seen as treatment for the disease, but rather used preventatively to minimise the risk of spread of the disease. I.e., soaking hive equipment, hive tools, bee suits etc.
Virkon S
Virkon S (potassium peroxymonosulfate, sodium dodecylbenzenesulfonate, sulfamic acid) is a disinfectant commonly used where there is a need to control pathogens. It has proven effective in sterilising equipment that has been in contact with Melissococcus plutonius, which cause European Foulbrood, as well as various viruses. Virkon S is available in powder form and should be mixed with water to a 1% solution. The equipment should then be soaked, scrubbed or scraped, rinsed, and aired before re-use as you would when using a sodium hypochlorite (bleach) solution. It is important to note that even though the two solutions are both effective, they are not interchangeable, as one works well with AFB and the other with EFB.
Washing Soda
Washing soda (sodium carbonate) can be used to clean and disinfect equipment such as hive tools and smokers as well as frames and timber hive parts. 1 kg of washing soda is mixed with 5 litres of water to make the right strength solution. Hive tools, smokers and other equipment can then be soaked in the mixture. Any items soaked in washing soda will need to be thoroughly scrubbed or scraped with a wire brush or similar to remove wax and propolis. Wash off any residue and airdry before use. For cleaning beehive frames using washing soda, they should be boiled in the same 1:5 solution, then rinsed and airdried before use. Whereas it is very effective as a cleaning method and against insects, mites and fungi, this process does not sterilise the frames or offer protection against spread of AFB and EFB.
Caustic Soda
Caustic soda (Sodium hydroxide) is very effective for boiling frames to clean and sanitise. The frames are submerged in a mix of caustic soda and water (about 1:20 strength) for 5-10 minutes until all wax and propolis has dissolved, and then dipped in clean boiling water to remove any residue. They are then airdried before they are rewaxed and used. Whereas it is very effective as a cleaning method and against insects, mites and fungi, this process does not sterilise the frames or offer protection against spread of AFB and EFB.
Less Commonly Used Methods
Radiation is not commonly used, but when it is it thoroughly sterilises frames and equipment.
Molten paraffin wax can be used for dipping hive equipment and frames into but is hazardous and not commonly done.
Acetic acid (ethanoic acid) is used for sterilising comb and is effective against the spores of chalkbrood, wax moth and Nosema spp. It is not proven to impact on AFB or EFB. Boxes with frames and comb are stacked and trays of acetic acid are placed on top. The stack is then sealed for a couple of weeks to allow the fumes from the acetic acid to work. Acetic acid is highly corrosive so care needs to be taken not to leave the treatment on too long or the metal in the frames and boxes will be affected. The method is not effective for cleaning beehive frames.
Cleaning beehive frames by boiling
I clean my frames by boiling in caustic soda. If you prefer to use washing soda instead, the procedure is exactly the same. This work is best done during a nice crisp day in winter. It should be no or very few flying bees about to bother you, but still dry and pleasant enough to work outside. Ideally you need two people to do this work. With proper motivation and plenty of cups of tea you can get through a few hundred frames in a day.
Tools and equipment needed for cleaning beehive frames:
Method for cleaning beehive frames:
Boil the Frames
Rinse and Dry
Thank you for reading. All the best in your beekeeping endeavours!
Hanna
This article was written for and first published in An Beachaire, The Irish Beekeeper, in 2021
Hanna Bäckmo
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