by JoeyS » Apr 17, 2007 4:14 pm
Hi dawn
you are correct, tobacco, when soaked in water for a day or two makes an excellent foliar spray to kill spidermites aphids and other plant eating bugs. I've used it myself. I guess you would have to know an organic farmer (and one that uses tobacco sprays, specifically) that farms over karst.
Another possibility is rain run off from a tobacco field. Plenty of that here in Tennessee. I'm sure it's made its way into at least one cave. Being that tobacco is organic itself, probably nothing to worry about though.
I thought, by the title, you would be asking about tobacco smoke in caves.
Good luck with that project.
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Joey Stuckey