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  1. #1
    Join Date
    Jun 2013
    Location
    Gothenburg, Nebraska, USA
    Posts
    34

    Default Oxalic Acid Treatment- Varroa Drench

    Oxalic: Varroa Mite Treatment

    Ingredients:

    3 Gallons of Corn Syrup
    1.2 Gallons of Water
    20 oz of Oxalic Acid

    Directions:

    Heat water to 140 degrees
    Stir & dissolve oxalic crystals
    Pour in straight corn syrup
    Stir

    Should use distilled water.
    Should use in one day.
    40 ml/hive.

    I use a one gallon garden sprayer with an open cone tip. Low pressure (generally one pump) and make sure to only squirt between the frames, mostly aiming to hit the cluster and open brood. Use 7-8 days after queen has started laying in new hive, then again 7 days later. This is a large batch, it shouldn't be hard to trim it down for hobbyists. Good luck.

  2. #2
    Join Date
    Dec 2013
    Location
    Arras, British Columbia, Canada
    Posts
    156

    Default Re: Oxalic Acid Treatment- Varroa Drench

    Quote Originally Posted by Double_Bee View Post
    Oxalic: Varroa Mite Treatment

    Ingredients:

    3 Gallons of Corn Syrup
    1.2 Gallons of Water
    20 oz of Oxalic Acid
    This is a horrible description. What percentage mix are you going for? What strength Oxalic Acid? 3.5% is the target strength by my calculations your recipe is close to 3.9%.

    Please folks use as recommended. http://medivetpharmaceuticals.webs.c...licacid996.htm

    Solution
    To completely dissolve oxalic acid dihydrate, use warm syrup. Dissolve 35 g of oxalic acid dihydrate in 1 litre of syrup made from a 1:1 sugar : water (weight: volume) mixture of sugar and water. Smoke bees down from the top bars. With a syringe or an applicator, trickle 5 mL of this solution directly onto the bees in each occupied bee space in each brood box. The maximum dose is 50 ml per colony whether bees are in nucs, single, or multiple brood chambers. Under certain unfavourable conditions, e.g., weak colonies, unfavourable overwintering conditions, this application method may cause some bee mortality or overwintering bee loss.
    140 grams Oxalic Acid is needed for 4 liters sugar syrup and will treat 80 hives.

    Dripping
    Dissolve 185 g Oxalic Acid Dihydrate in 4 litre of 1:1 sugar syrup or 6 oz in 1 US Gallon
    Pour 5 ml of this solution between each occupied bee-space onto bees.

  3. #3
    Join Date
    Nov 2011
    Location
    Rader, Greene County, Tennessee, USA
    Posts
    6,132

    Default Re: Oxalic Acid Treatment- Varroa Drench

    Randy Oliver also has a page on oxalic acid ratios for a drench ....
    http://scientificbeekeeping.com/oxal...eatment-table/

    That page from Randy offers 3 different ratios for different situations, each with differing amounts of oxalic per liter of syrup.
    Graham
    USDA Zone 7A Elevation 1400 ft

  4. #4
    Join Date
    Jun 2013
    Location
    Gothenburg, Nebraska, USA
    Posts
    34

    Default Re: Oxalic Acid Treatment- Varroa Drench

    Given that oxalic isn't a standard treatment, I find it ridiculous for you to call this recipe terrible. There is no standard. Just because Randy Oliver says to use 3.5% doesn't mean you have too. Professionalism requires critique, not attack. I was merely asking for someone to critique this so I could better it as I am not a biologist. Thanks.

  5. #5
    Join Date
    Nov 2011
    Location
    Rader, Greene County, Tennessee, USA
    Posts
    6,132

    Default Re: Oxalic Acid Treatment- Varroa Drench

    The 3 mixtures that Randy Oliver shows on his oxalic formula page range from 2.5% to 4.2%. Clearly 3.9% falls with the range that Randy published.

    I think that JoadieToadie may have jumped the gun on his characterization of a 3.9% mixture.
    Graham
    USDA Zone 7A Elevation 1400 ft

  6. #6
    Join Date
    Dec 2013
    Location
    Arras, British Columbia, Canada
    Posts
    156

    Default Re: Oxalic Acid Treatment- Varroa Drench

    Quote Originally Posted by Double_Bee View Post
    Given that oxalic isn't a standard treatment, I find it ridiculous for you to call this recipe terrible. There is no standard. Just because Randy Oliver says to use 3.5% doesn't mean you have too. Professionalism requires critique, not attack. I was merely asking for someone to critique this so I could better it as I am not a biologist. Thanks.
    If you were hurt I am sorry. It is actually a standard treatment outside of the USA. Oversimplification is never good. The description does not state the purity of the acid, what percent oxalic mix you are making, and the application of 40ml per hive is also simplified. (How big is the hive?) Treatments lose their effectiveness because they are not applied accurately. Mistakes can also be made that can damage the bees. I am just trying to state that accuracy is important when applying this or any other treatment. Below that I posted the exact instructions and ratios recommended by a reputable beekeeping medication supplier. It breaks down the target percent of oxalic acid (3.5%) in a 1:1 sugar water mixture. It also states an application of 5ml of mixture per frame space of bees.
    The recipe you posted is enough to treat 396 colonies as well.

  7. #7
    Join Date
    Jun 2013
    Location
    Gothenburg, Nebraska, USA
    Posts
    34

    Default Re: Oxalic Acid Treatment- Varroa Drench

    When you are treating 2000 hives at a time, you tend to treat them all the same so 40 ml is as good an estimate as any.

  8. #8
    Join Date
    Feb 2006
    Location
    Herrick, SD USA
    Posts
    4,376

    Default Re: Oxalic Acid Treatment- Varroa Drench

    Quote Originally Posted by Double_Bee View Post
    When you are treating 2000 hives at a time, you tend to treat them all the same so 40 ml is as good an estimate as any.
    I agree with both your formula and your dosage. It's almost identical to what we use though I prefer using sugar water rather than corn syrup.
    "People will generally accept facts as truth only if the facts agree with what they already believe."- Andy Rooney

  9. #9
    Join Date
    Jun 2013
    Location
    Gothenburg, Nebraska, USA
    Posts
    34

    Default Re: Oxalic Acid Treatment- Varroa Drench

    Jim I think it probably would be better, we just always have syrup around

  10. #10
    Join Date
    Oct 2010
    Location
    Benton, Arkansas, USA
    Posts
    211

    Default Re: Oxalic Acid Treatment- Varroa Drench

    I have used the instructions from Randy Olivers website at the medium level for 3 years in the fall or late winter when there is very little brood. It has always been very effective for me and I have not seen any adverse affects. I do like having ranges available to choose from. While it isn't an "approved" treatment, I have always found it very effective for a mite treatment when no or very little brood is present. I have also experienced heavy drops of small hive beetles each time I have used it. Good luck to you!

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