li>02.] PUBLIC DOCUMENT — No. 33. 61 



the one most susceptible to infection. One grower believes 

 that pot-grown plants are more susceptible to rust than those 

 planted in benches. 



The remedies suggested by the different growers consist 

 in hand-picking the affected leaves, selecting clean, strong 

 stock, discarding susceptible varieties, and inside culture. 

 These suggestions appear to us very reasonable, and if they 

 are carefully carried out there is at present little reason to 

 doubt that it can be practically eliminated. In regard to 

 the practice of inside culture during the summer, we find 

 that many excellent growers lay much stress on this prac- 

 tice, and from what we have seen of it we consider it very 

 essential in order to obtain plants free from rust. The reason 

 that inside culture results in less infection is probably due 

 to the avoidance of mists and dews on the foliage, hence 

 furnishing less favorable opportunity for rust spores to ger- 

 minate and cause infection. Care should also be taken to 

 keep all unnecessary water off the foliage in cultivating in 

 the greenhouse. One successful grower makes the following 

 statement: " I have found that when plants were planted 

 in benches in a good house, where plenty of air could be 

 admitted and the soil kept in good physical condition, they 

 were almost never troubled with rust." 



Most growers are unanimous in considering the chrysan- 

 themum rust of little consequence, and others look upon it 

 as a thing of the past. There are a few, however, who have 

 not succeeded in subduing it, who still think it a serious dis- 

 ease. Some have resorted to spraying, with results that 

 amount to little more than partial suppression. It appears 

 from our own observations, as well as from those obtained 

 from the most successful growers of this plant, that the 

 proper remedy lies in the judicious selection of healthy, 

 rust-free stock, and inside cultivation. If, however, any 

 of the leaves become infected, thev should be removed and 

 burned immediately ; and if a plant is badly affected, it 

 should be destroyed. In whatever manner the plants are 

 cultivated, whether in-doors or out-doors, endeavor to keep 

 the dew and moisture off the foliage as much as possible. 



