Worms and Flowers

Bt. Correction.

Posted in Pests by Lzyjo on September 29, 2009

Just an update on my last post Butterfly vs. Bt. Luckily, Daphne from Daphne’s Dandelions saved us all from the misinformation on Wikipedia.

Unbeknownst to me, there are three main strains of Bt used to target specific pests. Bt is not a broad-spectrum pesticide. Information about the three strains and their specific targets can be found on the Colorado State University Extension Website site.

The most commonly used strain is Kurstaki,which targets caterpillars, including cabbage worms, tent caterpillars and leaf rollers.  It is sold under the trade names Biobit, Dipel, MVP, Steward, Thuricide.

Mosquitoes and flies are treated with a separate strain Israelensis.

The third and fourth strains San diego/tenebrionis target beetles, like the Colorado Potato Beetle and others.

Check the ColoState page for more in depth info.

Sorry to scare you all. Bt is a safe pesticide, especially when compared with the alternatives.

Sheesh, I’d better stop using Wikipedia as the be all, end all. It certainly isn’t.

Thank you for clearing that up Daphne!

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4 Responses

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  1. Butterfly vs. Bt « Worms and Flowers said, on September 29, 2009 at 3:47 PM

    […] INFO: Bt Correction Tagged with: Bacillus thuringiensis, bt, butterflies, caterpillars, dying, insects 5 comments […]

  2. jgh said, on September 29, 2009 at 5:59 PM

    Come to think of it, I’ve only seen a couple of butterflies in my yard this year – both swallowtails. (And I haven’t used any pesticides at all except for a few slug pellets!) Good to know about the BT.

    Yeah, me too, Jen. I don’t know what to say about, it I don’t spray anything myself, but others do.

  3. tina said, on September 29, 2009 at 7:10 PM

    That is a relief!

    Isn’t it!

  4. Daphne Gould said, on September 29, 2009 at 7:19 PM

    I love Wikipedia, though I do take everything it says with a grain of salt. The articles are only as good as the people who write them and you haven’t a clue as to how expert the person writing was.

    Yes, I often double check their accuracy, but it didn’t even occur to me that they would neglect to mention the different strains entirely.


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