• Mann Lake Ltd.

Thanks to these sponsors, you can enjoy this website without annoying popup ads! You can show your appreciation by clicking on their banners above to go directly to their websites.


Varroa Management

Allow me to start with an excellent assessment by Bee Culture’s Phil Craft (BC July 2015):

Perhaps beekeepers who have come to the craft in the last few decades aren’t aware of the effect varroa had when it first arrived on this continent and of how it earned its full name, Varroa destructor. Whatever the reason, every year, beekeepers all over the country lose colonies to mites and the viruses of which they are carriers, and they never know what hit them. They blame pesticides,or CCD, or habitat loss, and sometimes those really are causes, or at least significant factors. However, too, too often, the underlying cause is a lack of effective management, which allows a mite infestation to overwhelm a colony or weaken it to the point that it succumbs easily to other stressors. The most frustrating thing about these losses is that they don’t have to happen.

Watch Dennis vanEngelsdorp explain why mite management is critical for colony survival, and which methods work or don’t at https://www.youtube.com/watch?v=4bm3Y4t1NwQ


2022 Extended-release Oxalic Update Part 3

Contents The slow effect of OaE. 1 Mite turnover 3 A bothersome question. 5 You don’t need to kill a single mite in order to control varroa! 5 Varroa’s world: Olfaction, taste, and touch. 7 Disruption of mite sensory perception. 9 “Blinding” or irritant?. 9 A relevant question. 9 Wrap Up. 10 Citations and notes […]

Read More

2022 Extended-release Oxalic (OAE) Update Part 2

Contents An additional test of matrices and OA:gly ratios. 1 Cardboard Strips vs. Sponges. 3 Compostability of spent sponges. 3 A winter field trial 4 Methods. 5 Results. 9 Discussion. 11 The Elephant in the Room.. 12 Reality Check. 12 A possible easy solution for getting us legal 13 Citations and notes. 15     […]

Read More

The varroa incursion in Australia 4 July 2022

I’ve been speaking on a daily basis with one of the two beekeepers whose operations are infested, as well as others in the industry. So far, over 1000 of their colonies have been euthanized, with many more planned to be burned.  As you can imagine, this is very emotional for those beekeepers, who have also been prevented from […]

Read More

Instructions for extended-release oxalic acid

Extended-release oxalic acid for varroa management This method of application of oxalic acid is not yet approved by the EPA.  However, EPA does not require an Experimental Use Permit for a limited number of hives.  Check with your State Lead Agency. Safety Although oxalic acid is not as reactive as stronger mineral acids, it can […]

Read More

A Test of Thermal Treatment for Varroa: Part 2

Beekeeper-funded Research A Test of Thermal Treatment for Varroa Part 2 First published in ABJ April 2021 Randy Oliver ScientificBeekeeping.com Last month I covered the theory of using thermal treatment (hyperthermia) to control varroa, and some of the designs of devices on the market.  I’d like to now answer some questions regarding thermal treatment. I […]

Read More

A Test of Thermal Treatment for Varroa: Part 1

Beekeeper-funded Research A Test of Thermal Treatment for Varroa: Part 1 First published in ABJ March 2021 Randy Oliver ScientificBeekeeping.com   Last month I wrapped up the report on my testing of mite treatments suitable for application during a honey flow.  A number of beekeepers have also asked me about using thermal treatment.  I found […]

Read More

Oxalic crystals on bees after vaporization

Crystals from oxalic acid vaporization on bees’ bodies Randy Oliver February 2020 In order to determine how OA crystals settled on bees’ bodies after an OA vaporization, I set a graduated microscope slide and a number of dead bees under a 16-oz inverted plastic cup.  I injected OA vapor briefly into a hole at the […]

Read More

Mite Control While Honey is on the Hive: Part 4

Mite Control While Honey is on the Hive Part 4 First Published in ABJ February 2021 Randy Oliver ScientificBeekeeping.com   In the three previous articles in this series, I showed the results of my field trial of summer mite treatments. Now let’s go a little further with extended-release oxalic acid (OAE).   A Note on […]

Read More

Mite Control While Honey is on the Hive: Part 3

Mite Control While Honey is on the Hive Part 3 First Published in ABJ January 2021 Randy Oliver ScientificBeekeeping.com   In my two previous articles in this series, I showed the formal results of my field trial comparing summer mite treatments.  We also have additional findings from other yards in which we applied extended-release OA.  […]

Read More

Mite Control While Honey is on the Hive: Part 2

Mite Control While Honey is on the Hive Part 2 First Published in ABJ December 2020 Randy Oliver ScientificBeekeeping.com   Last month I covered the setup of my field trial of summertime mite treatments, including experimental extended-release oxalic acid in glycerin.  I’ll now share the results.     The Results and Discussion Due to space limitations, […]

Read More

Mite Control While Honey is on the Hive

Mite Control While Honey is on the Hive Part 1 First Published in ABJ November 2020 Randy Oliver ScientificBeekeeping.com   During our hot, dry California summers most of our nectar flow may be over by early July, but if we’re lucky, our hives may still put on some harvestable honey.  In any case, to control […]

Read More

Refining the Mite Wash: Part 3 – Dislodgement, Precipitation and Separation

Refining the Mite Wash: Part 3 Dislodgement, Precipitation, and Separation Randy Oliver ScientificBeekeeping.com First Published in ABJ in September 2020 In my last article I showed how mites will quickly drop off the bees’ bodies if immersed in 91% alcohol.  But there are still more steps remaining to separate the mites from the sample of […]

Read More

Refining the Mite Wash: Part 4 – Comparing the Release Agents

Refining the Mite Wash : Part 4 Comparing the Release Agents Randy Oliver ScientificBeekeeping.com First Published in ABJ in October 2020 As I tested different release agents for varroa monitoring, I was often surprised by the results, which then raised new questions about why some worked better than others. So I ran a number of […]

Read More

Refining the Mite Wash: Part 2 – Mite Release

Refining the Mite Wash- Part 2 Mite Release Randy Oliver ScientificBeekeeping.com First Published in ABJ in August 2020 The high efficacy of hand dishwashing detergent at getting mites to release their grip on bees bestirred me to investigate this finding more deeply.  What I’ve come to realize is that there are four steps involved between […]

Read More

Refining the Mite Wash: Part 1 – Treatment Threshold and Solutions to Use

Refining the Mite Wash Part 1 Treatment Threshold and Solutions to Use Randy Oliver ScientificBeekeeping.com First published in ABJ July 2020 Once you’ve shaken a sample of bees, you then need to separate the mites from them.  There are various recommendations for using alcohol, detergent water, powdered sugar, ether, or CO2.  I’ve been using inexpensive […]

Read More