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Treatments For Varroa


Thymol — A new application method? Part 2

Contents Extended-release thymol 1 The optimal release rate and placement of thymol 1 What’s The Optimal Dose?. 2 Our Field Testing. 3 The Dose-Response Curve. 12 Discussion. 12 Citations and notes 13   Thymol — A new application method? Part 2 First published in ABJ in December 2022 Randy Oliver ScientificBeekeeping.com   I do a […]

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Thymol — a New Application Method? Part 1

Contents “Off-Label” use of thymol 4 Thymol products for varroa control 5 Understanding Thymol 6 Reaction to the delivery matrix by the bees 6 Thymol in Shop Towels. 7 Removal and dispersion of thymol matrices by the Bees 9 Extended-Release Thymol?. 11 A Thicker Matrix. 11 moving ahead to 2022. 15 Citations and notes 15 […]

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Formic Pro in Hot Weather — Slowing the rate of vapor release

Contents Hard “Flash Treatment” vs Slow-Release. 1 Flash Treatments 1 Extended-release application. 2 our Follow-up experiments. 3 But did the wrapped strips kill mites?. 8 Discussion. 9 Citations and notes 9   Formic Pro in Hot Weather — Slowing the rate of vapor release First published in ABJ in October 2022 Randy Oliver ScientificBeekeeping.com   […]

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Formic Pro and Queens in Hot Weather

Contents Formic for mite management 1 A trick for using formic pro on weak colonies 2 Queen loss in hot weather 5 Why would queens be more susceptible to formic than workers?. 6 A test of queen loss in tiny colonies. 7 Taking advantage of opportunity. 10 Trial #1 — Would foil covers reduce queen […]

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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     […]

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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 […]

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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 […]

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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 […]

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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 […]

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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 […]

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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.  […]

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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, […]

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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 […]

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Extended-Release Oxalic Acid Progress Report #5 – 2019

Contents Background. 2 The 2019 field test. 2 Results. 4 Those danged outliers!. 6 Overall efficacy. 7 Could there have been mite immigration from other colonies?. 8 Fate of the applied towels. 9 progression of action of treatment over time. 13 Results from others. 14 Mexico and uruguay. 14 Southeastern States with high humidity. 14 […]

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Extended-Release Oxalic Acid Progress Report #4 – 2018 California Field Trial

First published in: American Bee Journal, November 2018

Extended-Release Oxalic Acid Progress Report #4 2018 California Field Trial Randy Oliver ScientificBeekeeping.com Published in ABJ in November 2018 I’ve handed my beekeeping operation, still headquartered at my home, over to my sons Eric and Ian, with the provision that I have the hives at my disposal for research during my “retirement.”  This season I […]

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