152 CHRYSANTHEMUMS 



injury when allowed to spread. This disease 

 is generally induced by unhealthy con- 

 ditions surrounding the plants, or some 

 constitutional weakness of the plants them- 

 selves. If the plants are kept too wet during 

 cold, cloudy weather, and at night, or if 

 weakened by growing in a close atmosphere 

 without sufficient ventilation, the disease is 

 likely to attack them. Strong-growing 

 varieties that are given proper treatment 

 are rarely attacked. Hence preventive 

 measures are the most effective means of 

 combating the disease. Various fungi- 

 cides have been advocated by different 

 growers as remedies for this, as well as for 

 the rust, each grower, perhaps, recommending 

 a different remedy, just as many cures are 

 offered for the same human ill. I am fully 

 convinced that good cultural methods, com- 

 bined with rigid selection of stock for prop- 

 agating purposes, are the most effective 

 means of keeping plants of any kind in good 

 health; just as healthy breeding, good sani- 

 tary and hygienic conditions, combined with 

 intelligent diet and exercise, are the best 

 means of preventing disease of the human 

 race. 



