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  1. #1
    Join Date
    Apr 2009
    Location
    Stilwell, KS
    Posts
    2,819

    Default Shelf life of BT?

    I bought a bag of BT Aizawai a couple of years ago and had it stored in the basement. Today a found one of my hives overrun with wax moths so I mixed some up and sprayed the frames. If the BT was in my basement for a couple of years is it still good? How long does the stuff last? Isn't it made of spores that have to germinate?

    I also found a bag of BT kurstaki in my garage. This strain is supposed to be effective against moths and caterpillars. I know we are suppose to use Aizawai, but can kurstaki be used instead?

    https://en.m.wikipedia.org/wiki/Baci...ensis_kurstaki
    Honey Badger Don't Care ಠ_ಠ ~=[,,_,,]:3

  2. #2
    Join Date
    Nov 2009
    Location
    Manning, SC
    Posts
    4,254

    Default Re: Shelf life of BT?

    I don't know the shelf life is, but it only lasted for 3 years and what happened to you, happened to me. Now I buy new every 2 years. Cant comment on the other strain, but I would not trust it.
    http://OxaVap.com Your source for the Varrox Mite Killing
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  3. #3
    Join Date
    Nov 2011
    Location
    Rader, Greene County, Tennessee, USA
    Posts
    9,109

    Default Re: Shelf life of BT?

    If you have the Xantari brand of Bt v. aizawai, read this thread for info on decoding the "Lot Number" on each bag to a human readable date. http://www.beesource.com/forums/show...i-BT-Old-Stock

    Note that there has been outdated Bt v. aizawai sold in the marketplace.
    Graham
    . . . . . . "those who want to see, can see". - - [Oldtimer - 2016]

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