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Treatments For Varroa

Extended-Release Oxalic Acid Progress Report #3

First published in: American Bee Journal, January 2018

Randy Oliver ScientificBeekeeping.com As the synthetic miticides predictably lose their effectiveness across the world, beekeepers are turning more and more toward oxalic acid to control varroa. Unfortunately, oxalic is not a very efficacious treatment when there is brood present. To that end I am collaborating with USDA-ARS to petition EPA to add an extended-release application […]

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Extended-Release Oxalic Acid Progress Report #2

First published in: American Bee Journal, October 2017

Randy Oliver ScientificBeekeeping.com There has been a huge amount of interest in the extended-release application of oxalic acid for controlling varroa. I and my collaborators have been working hard to collect the data necessary get this treatment approved for use by U.S. beekeepers. We’ve still got lots to learn, but here’s an update. Disclaimer and […]

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Extended-Release Oxalic Acid Progress Report

First published in: American Bee Journal, July 2017

Randy Oliver ScientificBeekeeping.com In January I wrote about an exciting extended-release application method for oxalic acid [1]. I’m currently collaborating with the USDA Agricultural Research Service and the EPA to get this application method added to the current label for oxalic acid. In the interest of full transparency (and to show how I’ve been putting […]

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A Test of Late-Summer Varroa Treatments

First published in: American Bee Journal, June 2016

Last summer, deep in extended drought, we California beekeepers struggled with varroa. And I realized that I had long been using (and recommending) a mite treatment application based upon hearsay rather than actual data—shame on me! By trial and error, I’ve come up with a colony management program that produces strong colonies for almonds (despite […]

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Oxalic acid Powerpoint presentation

Updated 15 January 2016   Updated oxalic acid ppt presentation Since the EPA registered oxalic acid for the use in beehives (as far as I know, Brushy Mountain has the only registered product to date), I’ve been flooded with questions about using it (since I’ve used it steadily in my operation for over a decade). Therefore, […]

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Oxalic Acid Dribble and Sublimation Updates

Update 20 Sept 2017  There are YouTubes being circulated recommending using a heat fogger to apply oxalic acid.  Retired chemist Dick Cryberg, who is a very sharp guy whose observations I deeply respect, posted the following to Bee-L: I tried fogging with 10% oxalic acid dissolved in water.  I fogged ten five over five deep […]

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Simple Early Treatment of Nucs Against Varroa

First published in: American Bee Journal, April 2013

Randy OliverScientificBeekeeping.com Starting the season with a low level of varroa allows a colony to get a jump on the mite and its associated viruses.  I tested a simple method for incorporating varroa management into nuc production. Introduction When I try to understand something about beekeeping, I seek out examples from the extreme ends of […]

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Oxalic Acid Treatment Table

Table reworked and updated January 16, 2018. You can download a printable pdf doc of the table at: Oxalic acid treatment table 2018  It is critical to mix and apply oxalic dribble correctly (5 mL between each frame of bees), or you risk seriously harming your bees!  Be sure to read: http://scientificbeekeeping.com/oxalic-acid-questions-answers-and-more-questions-part-1-of-2-parts/ http://scientificbeekeeping.com/the-learning-curve-part-3-the-natural-miticides/ http://scientificbeekeeping.com/oxalic-dribble-tips/ http://scientificbeekeeping.com/oxalic-acid-powerpoint-presentation/ […]

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An Early Summer Test of Mite-Away-Quick Strips(tm)

Randy Oliver In the February issue of this Journal, I wrote about a fall trial that I performed with the new formic acid delivery method—Mite-Away Quick Strips (MAQSTM).  I had been impressed by their efficacy and ease of use.  Imagine my surprise and dismay when I received a couple of phone calls from beekeepers in […]

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IPM 6 The Arsenal: Our Choice of Chemical Weapons

I’m clearly in the “minimal chemical” camp, yet all my commercial buddies, without exception, depend upon “off label” use of agricultural miticides to keep their colonies alive. These are top-notch beekeepers, and I greatly respect them, learn from them, and have no problems with their methods. The reality is, they would all likely have gone […]

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IPM 7 The Arsenal: “Natural” Treatments – Part 2

Tenth in a series on integrated pest management of varroa © Randy Oliver 2007 randyoliver.com Let me tell you, researching and writing this series has been an education for me! Several of my preconceived notions have been stood on their heads. One treatment—powdered sugar—that I had dismissed as impractical, turns out to be surprisingly effective. […]

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IPM 7 The Arsenal: “Natural” Treatments – Part 1

Ninth in a series on integrated pest management of varroa Disclaimer: I am not licensed to make any pesticide recommendation. I am merely reporting on information from appropriate authorities. You should consult your local authority for recommendations. Update: please not that there are numerous updates on these methods in subsequent articles on this website. What […]

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Oxalic Acid: Heat Vaporization and Other Methods: Part 2 of 2 Parts

Originally published ABJ Jan 2007 Update December 2016: I suggest that you view my oxalic acid Powerpoint presentation, which I will try to keep up to date–http://scientificbeekeeping.com/oxalic-acid-powerpoint-presentation/ In my article last month, I detailed the use of the oxalic acid sugar syrup “dribble” for varroa control, with the consensus opinion being that the dribble method […]

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Oxalic Acid: Questions, Answers, and More Questions: Part 1 of 2 Parts

©Randy Oliver 2006 Why Oxalic Acid? European beekeepers, who have dealt with varroa much longer than we have, and who often face regulations that do not look favorably upon chemicals that may contaminate honey, noted that varroa is susceptible to organic acids–such as formic (in ants), acetic (vinegar), lactic (milk acid), citric (citrus fruits), and […]

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The Learning Curve – Part 5: The Future

Randy Oliver “I look to the future because that’s where I’m going to spend the rest of my life.” – George Burns Miticides in Development There are a number of new varroacides currently in development by various parties—some fairly close to release. Some are synthetics; some are naturally derived, such as propolis or plant extracts, […]

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