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  1. #1
    Join Date
    Dec 2007
    Location
    Hughson, CA
    Posts
    153

    Default Oxalic Application

    I was wondering if any commercial beekeepers have tried an oxalic application when feeding pollen supplement. During the winter I feed my patties in the middle; so I already have the split and if applied in mid to late December the hive should be as shut down as much as possible.

  2. #2
    Join Date
    Nov 2004
    Location
    Camarillo, CA, USA
    Posts
    314

    Default Re: Oxalic Application

    And why would want to use oxalic acid? also, if you do is not it a bit cool in the valley this time of year?
    Larry Pender,Jubilee HoneyBee Company,Camarillo, CA

  3. #3
    Join Date
    Jan 2009
    Location
    Cookeville, TN, USA
    Posts
    4,141

    Default Re: Oxalic Application

    Because it is a substance which naturally occurs in honey, spinach, and several other foods - and it's safe effective, and cheap? Also the levels of OA in the hive return to normal levels quite quickly - or so I have heard. However even though it is approved - and widely used - in almost every other country it doesn't seem to be here in the USA. Odd.

    However in places where it IS used, late fall after hives become mostly broodless seems to be typical - even where winters are cold.

  4. #4
    Join Date
    Feb 2006
    Location
    Herrick, SD USA
    Posts
    4,572

    Default Re: Oxalic Application

    I don't really see a problem with that Matt, if the hives are broodless and the temps arent too cold I would say the sooner the better (assuming you feel that your mite numbers justify it. There have been some studies showing that oxalic can result in a decrease of brood shortly after application. Splitting a double is an excellent way to get the treatment to the cluster. Smaller hives dont seem to tolerate it very well though. We have had good results with a 3.2% solution.
    "People will generally accept facts as truth only if the facts agree with what they already believe."- Andy Rooney

  5. #5
    Join Date
    May 2011
    Location
    Algoma dr. Ontario, Canada
    Posts
    1,085

    Default Re: Oxalic Application

    Perhaps different states have different policies on the usage of a substance in a beehive. Because something be not officially approved, does that make it an offense to use or merely an offense to promote or claim it as an approved miticide.

  6. #6
    Join Date
    Jan 2009
    Location
    Cookeville, TN, USA
    Posts
    4,141

    Default Re: Oxalic Application

    I talked briefly with a state inspector - I'll not say which state - and he was evasive in a manner which led me to believe that it may or may not be a gray area which he would be inclined to overlook/not ask about. IE "I'll get back to you..." or rather never mention this again.

  7. #7
    Join Date
    Dec 2007
    Location
    Hughson, CA
    Posts
    153

    Default Re: Oxalic Application

    Quote Originally Posted by jim lyon View Post
    I don't really see a problem with that Matt, if the hives are broodless and the temps arent too cold I would say the sooner the better (assuming you feel that your mite numbers justify it. There have been some studies showing that oxalic can result in a decrease of brood shortly after application. Splitting a double is an excellent way to get the treatment to the cluster. Smaller hives dont seem to tolerate it very well though. We have had good results with a 3.2% solution.
    The above quote regarding a decrease of brood is what I am trying to get a complete understanding of. I am wondering if a patty would counteract any decrease in brood rearing. Most of my almond contracts have a frame commitment; I wouldn't want to knock back a 10 frame colony to a six right before almonds. Buy the idea of hitting the mites when they are exposed with an effective soft treatment is appealing.

  8. #8
    Join Date
    Feb 2006
    Location
    Herrick, SD USA
    Posts
    4,572

    Default Re: Oxalic Application

    That is why I am suggesting the sooner the better but I really doubt that its a concern. I'm not aware that there has ever been any evidence that an oxalic application can cause a future reduction in brood only that one study somewhere claimed a reduction in brood shortly after application compared to a control. FWIW I have used oxalic when a lot of brood was present and never noticed any slowdown in those hives from casual observations.
    "People will generally accept facts as truth only if the facts agree with what they already believe."- Andy Rooney

  9. #9
    Join Date
    Oct 2005
    Location
    Saskatchewan, Canada
    Posts
    260

    Default Re: Oxalic Application

    Irwin, that is a pretty fancy machine. We have used the drip method for a few years but this year we purchased the varrox vaporizer to try. The things I like about this method is it can be done after the hives are wrapped without opening them and with our conditions here that is important. It does an very good job of filling the two brood chmabers with vapour. If you follow the direction for timing with this unit it works like a charm. (burn time and wait time) It also has to be about the lowest cost treatment going and mites should not develop a resistance to it. The only thing negative is it is slow to use. It took us about 6 minutes a hive so you need more than one unit if you are doing a lot of hives.

  10. #10
    Join Date
    Dec 2007
    Location
    Hughson, CA
    Posts
    153

    Default Re: Oxalic Application

    Quote Originally Posted by LSPender View Post
    And why would want to use oxalic acid? also, if you do is not it a bit cool in the valley this time of year?
    To answer your questions regarding temps., it would not be too cold in the valley in mid to late dec. Given the time, cost and efficacy I wonder why it is not a more common practice?

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