Blackclad hives in the snowThree months without blogging! And still with a backlog of drafts from the Michigan Beekeepers Association Spring Conference last March. We have been neglecting our readership almost as much as we have been neglecting our bees. By now we have had our first two snowfalls and while poor, empty Clarissa is by the barn, flipped roofless onto her stand lest mice occupy her before we can once again fill her with bees, the occupied hives are in a row, dressed in their winter black. We also have several one-pound bags of silica gel in their unoccupied halves to absorb moisture. They should work as well as the wool we had been using and be reusable next season after a spell in the oven. Sadly this is nearly all the winter care we have provided this season.

Master beekeeper Rusty Burlew has great overwintering success and attributes it to always doing what the bees need without delay or excuse. By contrast, we, slackers, in many of our blog posts lament trying to find a suitable window to tend to our few hives, when weather, our paying jobs, and other commitments combine to allow sufficient bee time. This year we did not even apply the late season oxalic drip although we are convinced it has been the largest factor in what overwintering success we have had. Although the mite loads have been low, almost nonexistent, all season they could still climb rapidly in late fall. Rather than sugar roll to check we hastily applied some formic acid pads while weather was still in the effective temperature range.

And for even more fretting, a late peek into the hives revealed that Beatrix and Frankie had, in what seemed to us a very sudden outbreak, small hive beetles. Fortunately the bees seemed to be keeping them adequately confined. Without time to make the boric acid bait for the traps we used six years ago, we hastily added along side the silica gel bags some strips of Swiffer pad to tangle-trap the tiny beetles.

Our winter fretting this season will be laden with guilt.

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Somehow we have not yet published a single post from this year’s Michigan Beekeepers Association Spring Conference back in March. And there are only eight months left until the next one, which our past reporting performance indicates is not much time at all. Let us then hastily commence.


Dr. Milbrath of the Sandhill reprised her Plan for Varroa talk from last year to a large and interested audience. Having already written about last year’s version of this talk we need not repeat ourselves but we shall post a few useful links.

We have dawdled enough that a revised version of the talk is available for viewing along with other recordings of webinars from Michigan State University’s Pollinator Initiative.

And there is an education section on her apiary website with links to articles on many aspects of beekeeping. The most relevant to varroa are:

We hardly need write anything further but we shall anyway.

Having heard the talk before we were better able to note smaller points that were overshadowed by the main message in the first hearing.

Some of the beekeepers who avoid treating their bees do so out of an attempt to stay “organic” and avoid “chemicals”. However organic farming standards do not allow the farmer to withhold treatment from a sick animal even if that treatment is not organic. Do honey bees under our care deserve less than cows or sheep?

Suddenly high mite levels can occur to anyone at any time. If you have been monitoring and treating responsibly then it is not your fault. You can not control hitch-hiking varroa from other colonies.

Although unnecessary treatments are to be avoided, allowances can be made for overwhelmed first-year beekeepers, who have so much to learn. Such a beek may simply treat by the calendar to keep varroa levels low while acquiring the skills to monitor in the next year.

Mite levels do tend to spike in the fall. Bees are reducing their population while the mites continue to increase theirs so the measure of mites per bee rises quickly. If you have observed this in previous seasons then using your local knowledge to treat in anticipation is permissible.

In a similar vein if you have lost colonies to varroa in previous years then treating by calendar to keep levels down is not “treatment”. It is “control”.

Let us end with a few words about our own monitoring. Wee Angharad has not yet suffered the indignity of a sugar roll. Dorcas a month ago scored zero mites in the sample. We shall be retesting her soon. Beatrix and Clarissa were tested just last week and also scored zero mites. We can hardly believe the low scores but it is yet early and they have each had a brood break for one reason or another. We shall remain vigilant.

Next on our race to finish reviewing last year’s MBA talks is Dr. Meghan Milbrath‘s Planning for Varroa. Oh, how we have dithered over this review. After all, the link we just gave takes you to an online version that is pretty much the same as what we heard minus a few pictures we are not going to try recreating. What could we add to simply pointing our visitors to it and encouraging them to read it? And yet most visitors seem not to follow links. Since Dr. Milbrath begins by pointing out that we are in the midst of a varroa epidemic it seems important that we at least try to provide a summary of sorts.

Here then is the rede as we understand it.

  • Monitor your mite load.
    • Alcohol wash or sugar roll.
    • At least monthly but especially when winter bees are being made.
  • Know the “safe” level of mites.
    • General consensus as of 2017 is 3% or 9 mites per standard 1/2 cup(100 ml) sample.
    • At levels above 5% illness is usually seen.
    • At levels above 10% the colony is a danger to those around it.
  • Know the tools for managing mite levels and be ready with a plan to treat.
    • Management methods to keep low mite levels low. Used all season to slow mite reproduction.
    • Intervention methods to drive high mite levels low. Used when mite levels are above threshold.
      • It is too late for non-chemical management techniques if the mite load is very high.
      • Vary chemical treatments to discourage development of immunity in the mites.
  • Make slow progress towards treatment-freedom.
    • Make splits of your colonies that require the least treatment.
    • Requeen your colonies that require excessive treatment with queens from resistant lineage, commercial or your own.

But I am hardcore treatment-free and my plan is to just let them die. Why should I monitor?

Please do not do that.

For one, these are useful creatures in our care to whom we owe better than an unpleasant, lingering death.

For another, they may have other useful genes which would be lost if varroa resistance were the only criterion considered.

Finally there may be colonies in the area successfully resisting low levels of varroa who, upon robbing your deadout, will acquire a number of hitch-hiking mites and may now succumb to the heavier mite load, losing good resistance genes for not being perfect. You will have made a varroa bomb.

But my bees seem fine. I do not see any mites. Why should I monitor?

Varroa is very hard to see on bees until it is too late. You will not know if you do not monitor.

But my bees have been surviving without interference for years. Why should I monitor?

Congratulations on your good fortune but conditions change. Dr. Milbrath had a bee-yard where a mere annual split was sufficient to keep mite loads low. The bees did the rest. Then one year the mite levels suddenly jumped. A neighbor had abandoned four hives which then died and became varroa bombs. Her own hives would have done likewise had she not caught the change and treated to push levels back to previous values. You will not know if you do not monitor.

But I got my bees from a treatment-free, resistant source. Why should I monitor?

Your conditions are not the conditions of your supplier. Mite pressure in their area may be lower than in yours. They may be able to manage them simply by all the making increase needed to have bees to sell. For whatever reasons, treatment-free success does not always transfer. You will not know if you do not monitor.

But this is a package’s first year. I need not worry until the second year, right?

One, wrong. We have made that mistake. Two, you know the refrain. You will not know if you do not monitor.

OK. My bees died over winter but it was the cold and damp, not mites.

Did you know what to look for when you inspected the deadout? We have used this excuse ourselves. We were wrong.

Fine. I will monitor. I’ll worry about a treatment when I need it. Which I won’t. Because I have good bees.

May your bees never need treatment but if they do, as with many an unexpected misfortune, it is better to have considered options and decided upon a plan well in advance rather than be forced into hasty decisions under pressure.

Gowry's painting of Icarus fallingOne imagines that after his initial, frantic flapping developed into deliberate, controlled flight Icarus was surely feeling rather confident at the moment just before the beeswax started to soften and the feathers to drop away. We too had our brief period of confidence when, after years of frozen deadouts, all three hives survived last winter, which we credit largely to finally managing varroa, especially applying an autumnal oxalic acid drizzle. With our freshly acquired knowledge and skill this season was going to be a change from our usual winter moaning over whether or not we would have any bees at all come springtime. Perhaps not.

We had tried to be timely this year with the oxalic treatment, beginning with Dorcas of the alarming mite counts, who took her medicine as calmly as last year. But when we continued to Clarissa she let us know that she was not receiving visitors, however well-intentioned, so we retreated to deal with stings, intending to try again another day. Whereupon the weather turned far too cold to be wetting bees and remained so as we applied the insulation to the hives, still hoping for a few warm days when we could treat the remaining two hives.

The hoped-for few warm days finally arrived last week and we returned with a fresh batch of oxalic syrup, this time planning to start with reliably even-tempered Beatrix and leave the stinging Clarissans last. But misfortune struck soon after we moved the follower board. The first top bar had two, large, partial combs that had not been merged into one and each was attached to a side of the hive. We had barely begun to cut away one attachment with the sharp end of the hive tool as we routinely do when a crack shot across the top of the comb and it suddenly dropped. Switching to a serrated knife we sometimes use, we tried to cut the other attachment but at once the second comb cracked free as well. At a loss for proceeding, we propped up the fallen combs to be next year’s problem, closed the hive, and abandoned our oxalic plans for the season.

So two hives did not get their oxalic treatment and the one that did had high mite counts before the expected autumnal rise. Once again we shall be fretting through winter. And muttering quiet blasphemies against Apollo.

 

Oh, had we but seen this video a few days earlier, in time for Halloween!

A three-minute thesis competition is a contest for PhD students in which they condense their thesis into a three minute presentation comprehensible to an intelligent audience lacking any background in the research area. Doctoral candidate Samuel Ramsey was the winner in such a competition at the University of Maryland and will go on to the worldwide competition. Congratulations, soon-to-be-Doctor Ramsey!

To present his findings even more briefly than the video, we have been assuming that varroa mites chiefly live on bee hemolyph but actually feed mainly upon the tissues in the bee’s abdomen known as fat body, a name that does not do justice to its nine important functions. Denied this food source and fed on only hemolyph the varroa do not live as long nor reproduce as well. So with a slightly strained metaphor we have been trying to stake vampires when we need a silver bullet for werewolves.

So it’s werewolves not vampires. And it’s Istanbul not Constantinople.