There are a number of other fungus diseases of 
tobacco that have not been recorded in Wisconsin. The 
absence of these diseases is a result of the absence of 
the pathogens or conditions unfavorable for disease 
development, not because of the resistance of the 
tobacco. Some of the more important of these are 
(18): 
Fusarium wilt ( Fusarium sp.) 
Frog eye (Cercospora nicotianae) 
Brown spot ( Alternaria sp.) 
Black shank (Phytophthora nicotianae f. parasitica) 
5AJ7 Alterations in Susceptibility to Bacterial Diseases 
There are two bacterial diseases that are, at times, important in 
tobacco culture in Wisconsin. The experimental tobacco to be 
field tested has been altered to make it insusceptible to crown 
gall. This disease, however, is not known to occur naturally on 
field tobacco, so that resistance to the disease would have, per se, 
no ecological effect. There is no reason to believe that the 
genetic changes introduced into the tobacco in the test plot should 
affect susceptibility to bacterial diseases other than crown gall. 
Any changes should be confined to the test plot. 
Environmental Assessment 
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