TX Organic Research Center



Bacillus thuringiensis (Bt) Update

The biological pesticide Bacillus thuringiensis (an organic gardening product) is a  bacteria applied as a spray to kill caterpillars.  Sold under a variety of names such as Thuricide, Dipel, Bio-Worm, and others.* 

Bacillus thuringiensis 'Israelensis' (Bti) in water for the control of mosquito larvae.   Molasses at 1-2 oz. per gallon of spray also helps.  It provides protein and keeps insect-killing bacteria alive on the foliage longer- even during rain.  Bt 'San Diego' is good for Colorado potato bettle, elm leaf beetle, and other leaf-chewing beatles.



*I rarely recommend Bt anymore and never as the first choice. I would personally never use it because other things work as well or better such as  release of trichogramma wasps as a preventative and EcoSMART or Eco EXEMPT as a curative.  Plus Bt kills butterflies. The good side of all this is that more and more exposure is being given to the problems related to GMOs.


New Findings--Bt Toxin from GM crops found in human blood: Dinesh C. Sharma  | New Delhi, May 11, 2011 |  

Link to orginal article. 


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