SPOT, OR SPOT DISEASE. 169 



produces any injury, but where several fumiga- 

 tions are made in close succession damage is al- 

 most sure to result. Spraying the leaves with 

 tobacco water is apt to produce similar effects, and 

 for this reason we have abandoned the use of 

 tobacco entirely. 



Much evidence could be adduced to show the 

 deleterious action of tobacco, but it is not neces- 

 sary to go into details upon this matter, as one or 

 two examples will suffice. In one instance green 

 aphis was causing considerable trouble in our 

 houses, and in order to destroy it we fumigated 

 heavily with tobacco for two or three nights. Im- 

 mediately following the fumigation, spot appeared 

 to an alarming extent, and it required several 

 months of hard work and extra precautions to get 

 rid of it. We did not realize at the time the con- 

 nection of the fumigation with the trouble, but 

 afterwards it was brought to our attention in a 

 number of other ways, and has been proved many 

 times since. 



Finally, it may be said that if careful atten- 

 tion has been given to cultural work throughout 

 the entire season, little trouble need be apprehend- 

 ed from this disease. It is only where the grow- 

 er has been careless in certain directions that 

 trouble is likely to ensue. Many have the unfor- 

 tunate habit of neglecting little details here and 

 there, and then when the disease appears making 

 a gigantic effort to get rid of it. If attention had 



