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I did some research some years ago on the overseas product called B401 (recently reformulated and given a new name) and Certan both a Bt aizawai. The local caterpillar organic treatment is Bt kur

This, an interesting article i found on another web site.   BT ( Bacillus thuingiensis) can be purchased in your garden center or hardware store, it is a dried bacteria in powder form and is

https://www.bunnings.co.nz/kiwicare-4-x-2-5g-organic-caterpillar-bio-control_p00037637 Only sprayed on frames after last extraction and dry off!

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Here is the full study 

AND in my hunting variety "Kurstaki" is harmless to bees. (But can't find reference to effectiveness on varroa..still looking..

 

https://hal.archives-ouvertes.fr/hal-01234771/document

And from 

https://www.canr.msu.edu/news/how-to-control-invasive-pests-while-protecting-pollinators-and-other-beneficial-insects

 

Bacillus thuringiensis (B.t.)

Products containing B.t. are made from a naturally-occurring soil bacterium. Many different B.t. products are available for landscape professionals and homeowners. Different strains of B.t. target specific pest groups, making them selective pesticides. For example, spores and crystals of Bacillus thuringiensis var. kurstaki (B.t.k.) are highly toxic when ingested by butterfly and moth larvae (caterpillars). The crystals containing the toxin dissolve only at an extremely high pH found in the caterpillar’s gut. B.t.k. is not toxic to bees. However, avoid spraying or allowing spray to drift onto favored food plants of caterpillars such as milkweed, the sole food source for monarch butterfly caterpillars.

Another strain of B.t., B.t. galleriae (B.t.g.), targets several species of beetles in the adult and larval stages including scarab beetles (e.g., Japanese beetle), flat headed beetles (e.g., emerald ash borer), weevils and leaf beetles. B.t.g. is not toxic to bees or butterflies, but applications should be avoided where predatory beetles are active. B.t. galleriae is now available at garden centers and recent testing indicates that it will control Japanese beetle adults for two weeks after it is sprayed. It will not harm pollinators, but it is toxic to monarch caterpillars.

And this https://pubs.er.usgs.gov/publication/5223891     indicates Var kurstaki kills at least one member of the mite (Acari) family 

 

 

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13 hours ago, Alastair said:

So by that Sailabee you mean there could be a risk to contaminate the next honey crop?

 

Exactly, Alastair, if it is toxic to humans when applied, it will continue to pose the same threat in the honey if it has the prerequisite conditions for the bacillus to grow - that's as I remember the micro-biology.

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