Category Archives: beekeeping

Community Veggie Garden

New site link: http://bees.millar-knorr.nl/beekeeping/second-apiguard-treatment/

Just a short update.

Because the weather was lousy here for a few days. There even was some record number of nonstop rain hours, 60, which apparently this is not unheard of in autumn, winter or spring but quit rare for summer. Anyway, the rain prevented me from continuing the Apiguard treatment, replacing the tray for a new one. Saturday was cold-ish so I thought “I’ll do it tomorrow in between showers”…but there was no “in-between”.

I think I already mentioned that I was missing a honey super from the bee stand but now I’m also missing a syrup feeder. I’ll contact the beekeepers society that exploits the apiary. I’m thinking that maybe I should take my bees somewhere else and not store my stuff at the bee stand. My wife started a community vegetable garden close by, which has a garage close by where we get our water from. On top of this garage I can place the bees. That way non of the gardeners or visitors (both of which a surprising number are afraid of getting stung) will be directly confronted by the bees.

The drones in the above video are desperate for a meal, there were a lot visiting the colony. I don’t know if my girls are one of the last to continue to feed them, I didn’t notice as many at the other hives. In dutch they call the cession of feeding the drones “de darren slacht” which literally translates to the drone slaughter even though the workers don’t actually kill the drones they at most drag them out of the hive and refuse to feed them. I don’t know what the official English term for this behavior is, anyone? Compared to many solitary bees the honey bee male has is easy, he gets fed and is welcomed everywhere. Many solitary bees have to defend a range against intruders and other males. They don’t get free room and board or they get lucky a date with a queen. They just work their ass of and if they’re lucky get to mate with a number of commoners…

FYI, I reduced the hive entrance before I left so the girls don’t have defend such a large opening against wasps and robber bees.

Andrew

Queen cell

Two Queens

This time of year it’s possible to find two queens in your colonies, don’t panic, this is often caused by a silent supersedure. That’s where the bees decide that an old queen or under performing queen gets dethroned by the worker bees. So I guess bee colones are more of a democracy rather than a monarchy than you would think.

A blog from our national bee society mentioned this issue recently. I think this is what happened to Sif last year. I was already not very satisfied with the queen but didn’t get to replace her. Then I found an empty queen cell in early fall. I didn’t know what to do, but already suspected a silent supersedure. As I hadn’t marked my queen, I had no way of knowing.

What I don’t understand is why the new queen doesn’t eliminate the old queen immediately, and if she doesn’t what happens to the old queen? Does the new queen kill the old queen later, after a nuptial flight? Do the worker bees eliminate the old queen? Does the old queen leave of her own accord? I don’t know, although the last option seems unlikely to me. Anyone have any idea?

Andrew

New Varroa Treatment

Okay I don’t know if it is actually new, the method is so simple that I can’t imagine that no one has ever used this before. There was an article in the monthly magazine given out by the Dutch national beekeepers association about this Varroa treatment and I had not yet heard of it, it sounds quite intuitive.

In this treatment you would wait till after the last honey harvest so this time table is dependent on when you finished that. Starting too late will perhaps impact the rearing of winter bees. With this treatment, say in the first week of July, the queen should be caught and then trapped between two queen excluders in a honey super with at least 5 drawn frames at the bottom of the hive. Two weeks later the frames with brood should be removed and replaced with new drawn frames. A week after this, the queen excluders should be removed and a week later still you should remove the frames with closed brood along with the the honey super.

Now the idea behind this method should be quite evident and seems simple. You don’t give the varroa any other place to hide accept in the brood, trapped in the supper with the queen. By taking away the brood you, over a number of weeks, take away most if not all Varroa mites.

The only drawback of this method I see, is that this would impact the bee population quite dramatically. You would essentially be removing almost 4 weeks of new bees from the hive. The reasoning behind this method according to the article was that treatment with formic acid, which is common in the Netherlands at the end of summer, takes a hefty toll on the bees. Living in the fumes of 80% formic acid for over 3 weeks can’t be fun. I should know, I got 80% formic acid in my face once and let me tel you, that wasn’t pleasant.

So I guess all methods of treatment have drawbacks and you should go by you’re own experience. But with the number of colonies I have (uhm…one), I can’t experiment. So I guess this year I’ll be using the method I used last year which was the Apiguard variety. But this year I’ll keep a close eye on the mite drop (and look for any ants) not forgetting the Vaseline this time.

Andrew

(link to article on new site: http://bees.millar-knorr.nl/beekeeping/new-varroa-treatment/)

Moisture Quilt

Moisture quilt by Herb Lester
Moisture quilt by Herb Lester via the Honey Bee Suite . Photo: Herb Lester

I had read about moisture quilts before in a cursory manner and at first thought it slightly ridiculous. But then I read an article (and then a series of articles) on a blog I read and take seriously: Honey Bee Suite. I know it may seem slightly like a “argument from authority” fallacy. But Rusty from the Honey Bee Suit seems an experienced, quite well informed and down to earth apiarist, as well as an accomplished blogger. Rusty claims:

“Of all the changes I made to my hives over the years, nothing has helped more than the moisture quilts. I’ve used quilts for five years now, and on average, I went from overwintering 50-60 percent of my hives, to overwintering 80-100 percent.”

But what I would be more interested in is knowing what percentage of the bees themselves survive the winter with or without moisture quilts. Rusty seems to have quite a large number of hives, estimating from other blog posts I’ve read, I’d say well over 10. My own two hives can hardly provide enough data to get any significant results on hive level. Thats why I’m more concerned with how many of the bees in the hive survive winter, if more survive then the hive will start the season healthier and grow faster.

queen-cell
This doesn’t look like a swarm cell to me

Sif didn’t show signs of swarming so didn’t require the making of an artificial swarm this year and had seemed to start slow in spring. Which says to me that it was a weak hive/queen to begin with. I already had a feeling that the queen was slightly sluggish in spring. I was planing on replacing her later in the season but didn’t. I have the impression that there has been a silent supersedure at the end of summer (see picture on the right) when I had started my new job and didn’t check the bees as often as I should have. I wasn’t expecting swarms so late in the season, nor did I get one. Depending on the the performance of this new queen in Sif, I will replace her with one from Artemis next season. Artemis was already a strong hive this year and I expect it to start the next season strong, the young queen comes from a pure strain mother (I forget if the mother was a buckfast or carnica). Back on topic; I’m making (actually Pieter Knorr is making them as I’m feeling slightly under the weather) moisture quilts and will report on how they seemed to perform at the beginning of the bee season next spring (The Netherlands is a quite humid place so I guess that they should do what they are supposed to). Even though it will be hard to say if any observed effect is due to the quilts or some other unknown effect(s). I have yet to see any other beekeeper in my apiary use moisture quilts but that could also be because I haven’t been looking for them. But they were also not mentioned during the beekeeper course I followed. Perhaps I will also ask a local beekeeper on the topic, even though I have no idea what to they would call these constructions locally. Andrew

Winter preperation

sugar syrup feeder
Bees feeding on the sugar syrup. The number of dead bees in the feeder is a little disturbing

I’m preparing the colonies for winter; I’ve assessed the amount of honey in the hives and the size of the colonies. There are about 7 frames of caped of honey between the two hives, perhaps 14 kilograms total. Both Sif and Artemis seem large enough to survive winter on two brood boxes. The bees need about 15 kilograms of either honey or sugar to make it through winter. Which would mean that after I divide the honey evenly between the two colonies, they both need an additional amount of about 9 kilograms of sugar in about  11 liters of sugar syrup. Then I still need to place the caped honey on the outside of the hives because caped honey is very slow to go bad and the bees spend little time at the outside of the hive. Last thing I have to remember to do is reduce the hive opening, to prevent mice and robing by other bees and wasps.

I’ve placed the (2 liter) feeders in the hives yesterday and filled them with about 2 liters of sugar syrup. I forgot to take a picture, but will add one the next time I fill the feeder, which will be in a day or two. They empty the feeder within two days. Which is extraordinary when you think about it. A bee can carry about its own body weight in honey/syrup, 0.1 gram. Which would mean that if one bee were to empty a feeder it would have to make the journey from the feeder and store it in a cell 26 thousand times… I’ll go see the day after tomorrow how far they emptied the feeders and return if they emptied them.

There are mixed reports what to do with humidity and ventilation. I’ve seen stories about constructions on top of the hive filed with wood chips to deal with humidity. But I also read somewhere else about having a sheet of plastic beneath the hive cover to provide water for the bees in the form of condensation droplets. I do’t know what is supposed to be the better choice. Likely it is dependent on climate, and I don’t know aht whould be the best strategy for the Dutch klimat. There was some fungus growth after the last winter but I read somewhere else that this is normal and should be expected.

When these preparations are finished there will be nothing for me to do, until near the winter solstice, when the bees will get their oxalic acid treatment.

I always wonder what the girl behind the supermarket checkout thinks when I come to the checkout with 9 kilograms of sugar and nothing else…

bye bye, Andrew

Edit: The bees emptied the feeder within two days, as I thought. But many bees died in the process. Perhaps that is because the second cover of the feeder is missing and the bees will enter the feeder from behind the excluder and easily drop in the syrup. I’ll order a new cover for the feeders asap, and I hope that that will help.
I left the dead bees in the feeder because bees that drop in the syrup perhaps can use the dead bees as flotation devices and crawl to safety.

Edit2: I just gave them their third serving of sugar syrup (6 liters total) and placed the second cover on the feeders so the bees couldn’t access the syrup directly and consequently fall in and drown. I talked to a fellow beekeeper visiting the apiary and he told me that he just used a tub with room for about 8 liters of syrup in which he put straw to prevent the bees from drowning. Hay would grow fungus pretty quickly (something I have already experienced) but straw wouldn’t and the bees would clean any trace of syrup from the straw. I’ll see if I can get my hands on some straw (from a local pet store or something) without turning my home into a barn, perhaps keeping the straw at the apiary would be the ticket.

Varroa explosion

Because of the nice weather in winter and spring the varroa populations have exploded. Winter treatment against varroa using oxalic acid is used during winter because that it is the only time that the colony is not expected to have any brood. A single treatment should impact all varroa as there should be no varroa protected inside caped brood cells.

But because of the mild weather this winter there is a good chance that the bees did have capped brood, most likely filled with varroa. And then there was the mild spring which gave the mites a head start in the bee season letting their population grow to new heights.
That is why this year the varroa treatments here in western Europe are especially important. Varroa can be a major cause in colony death over winter. More so than lack of food or extreme cold.

The local apiarists organisation in the Netherlands has published an article on the explosive varroa population growth. A beekeeper counted 4 times the varroa he would count in an average year. You can view a translation of the article by following this next link (in all honesty the translation isn’t all that good, but kind of readable).

I’m not sure how the varroa population is going in my hives. I’ll check the mite drop after the 5 weeks of apiguard treatment tomorrow and update this post accordingly (if the weather allows, lot of rain here lately).

Talk to you soon,
Andrew

Battling Varroa

ApiguardI’m using a, for me, new tool in my effort to combat varroa in my colonies, apiguard. You place a “serving” of apiguard on top of the top bars of the frames and leave it there for two weeks and repeat.

From the Apiguard website :

Worker bees climb into the Apiguard tray, remove the gel as a hive-cleaning behaviour and distribute it throughout the colony. The gel sticks to the bees’ body hairs and, as the bees move through the hive, particles are left throughout the hive. The worker eventually throws out the gel it is carrying, but the traces remain until they too are removed later.

The gel acts like a slow thymol release agent. Thymol is a naturally occurring substance that has proven to work as an anti varroa agent as well as being an antimicrobial and fungicidal substance.  Seeing my earlier experience with formic acid, this perhaps is a good alternative. Although I forgot to place a bottom board in the hives to see the varroa drop, thus making it hard to compare it to the formic acid treatment. But perhaps I’ll see less varroa in December when I treat with oxalic acid because of this treatment.

You do need to be done with your honey harvest because the thymol will also dissolve into the honey giving it a distinctly unpleasant taste. You should also not feed the bees while giving this treatment because the bees will be to busy with storing the feed syrup to disperse the thymol gel.

Otherwise Sif and Artemis are looking good. Next on the todo list is judging the fitness of the colonies in the light of winter survival. Will need to asses their size and food supply to estimate how much feeding they will need.

Andrew

Colony naming

The Diana of Versailles
Diane de Versailles Leochares
Licensed under Public domain via Wikimedia Commons
 

As I said in my last post I wanted to name my colonies. Having thought it over and discussed it with my wife, who is more familiar with Greek mythology. I came to choose two names. I first came up with Sif for my old colony in reference to the old Nordic goddess “associated with earth”. I wanted to call the second colony in reference to a Greek goddess and my wife came up with Artemis who is in part a Greek equivalent of Sif. Artemis, from Wikipedia; is the goddess of the hunt, wild animals, wilderness, childbirth, virginity. Which apart from the first and last part I think is quite appropriate.

So in following blog posts I will be referring to the colonies under those names. (Dutch version: link)

Andrew

Quiet here -updated

I haven’t posted for a while, partly because I have a new job and partly because very little has happened with the bees. I just put on a second brood chamber and I’m still not sure if I’ll have to create an artificial swarm this season and if I’ll be using a honey chamber this year or not. I think not as it is already past the summer solstice. I’m still not so sure about this queen the colony seems to be growing very slowly, maybe I’ll remove her next month if I feel the colony is still lagging.
I met a fellow apiarist at the apiary this Friday who I hadn’t seen there before (although that isn’t saying much). He told me he had 5 hives there which were proving more work than what he had bargained for. and was willing to sell a colony to lighten his load. As I haven’t heard anything about the other colony I maybe could take over, I am anxious to get my hands on a second colony from somewhere.
Update: Well I bought a colony from the guy I mentioned above. The fellow apiarist had just taken an artificial swarm from the colony and was waiting for the new queen to start laying before selling it. Well, the queen is laying like crazy as far as I can tell. We checked the hive today and the colony, on a single brood chamber right now, is already pretty big with about 7 frames full of brood at the moment. I’ll have to add the second brood chamber pretty soon or the single brood chamber will start feeling cramped.
I’ll try to take a picture of the queen next time I see her, in my eyes she is enormous. Unmarked as of yet something I would like to start doing but that requires some . Certainly compared to the queen in my first colony. I’ll have to start naming the colonies which I have read people do, to help keep them apart on the blog. I’ll have to put some thought in that.
My first colony is still plodding along, no hurry. I think I’m going to replace the queen, hopefully with a queen from this second colony. I think I’ll remove the queen and then add a frame with eggs from the second colony, hoping that eggs from the second queen will produce a queen with a similar productivity. I wan’t to face the winter with two strong colonies.
I’ll keep you updated. (Dutch version: link)

Andrew

Replacing comb influences colony health?

The bee research group in my country, bijen@wur, organized a symposium last month which I didn’t attend. One of the speakers there was bee researcher Dennis van Engelsdorp (weirdly dutch sounding last name, translates to “English village”).  He presented statistical data from a beekeeper survey that suggested that annually replacing to much of the comb (50% or more) negatively influences colony health. Often the idea of replacing comb is to prevent buildup of pesticides and/or pathogens, but it also looks ugly blackish comb. But the data shows that beekeepers who replaced 50% or more of their comb compared to beekeepers who don’t replace any, lose more colonies over winter.

It is unclear what causes this, the survey was not comprehensive enough for any analysis like that but the data is clear. They suggest not to replace more than about 20% of your comb annually. I was aiming to replace about a third of the comb but according to this information I will have to amend that. Apparently reusing comb from old colonies is also not advised as it also caused more winter deaths. The only problem is the lack of additional information in the survey. For instance it is unclear what the origins where of the reused combs. Perhaps the old colony died of disease.

So much is unclear, it wasn’t a study but only a survey. What is clear is that you shouldn’t renew  to much of your combs annually. See the accompanying video for yourself (there is also a link to the web page in its description):