The US is in darkness, the rest is in light. TMV could be a problem, I may not be so bright. Using tobacco products may not be right, depending on what country is in sight. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Ok Peter. How is this for a thought. If your chewing tobacco comes from KY or your seeds have a KYxxxx number on it (KY in this case stands for Kentucky) don't worry about it. If your chewing tobacco comes from the outback, Then simmer at about 200 F 98-99C for about 10 min. This inactivates (kills) TMV Add dishoap to the spray, This also inactivates (kills) TMV. 99% of the sources I can find say that adding ethanol also inactivates TMV. You have killed it 3 times isn't that enough? Lord Byron