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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 beetles.


*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


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