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Nicotiana longiflora(See picture) (http://www.uky.edu/Ag/Tobacco/N_Species/N_longiflora.html) has been a significant source of disease resistance in flue-cured and burley tobacco. Some of the disease impacted by resistance from this species are: black shank, cyst nematode, rootknot nematode, and wildfire. The resistance form N. longiflora imparts near immunity to race 0 black shank, but no resistance to race 1. One of the varieties still in use today is 14 x L8, the second most popular burley tobacco variety in the US.
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