152 HATCH EXPERIMENT STATION. [Jan. 



those set out in open beds showed any signs of the disease. 

 It seemed pretty evident, therefore, that the high August 

 temperature of the house had a bad effect upon the plants 

 confined in pots, causing them to be more susceptible to the 

 disease. Some of the plants which were still out of doors 

 in a cold frame also became rusted, but these were crowded 

 together so that all the lower leaves had fallen off, and were 

 plainly in poor condition. Of the many plants which were 

 set out in open beds in August or placed on benches with 

 space between them in September, not one showed any 

 noticeable rusting. 



It remains to be said that the rusted plants, though badly 

 affected, produced blossoms as good, apparently, both in 

 quality and quantity, as similar healthy plants, and, further- 

 more, did not spread the disease to other plants, though kept 

 in close proximity to them. Judging, therefore, from this 

 year's experience, it seems probable that the skilful gardener 

 has no great cause for apprehension in this disease. 



A New Pansy Disease. 



During the past summer our attention was called to a field 

 of pansies at the establishment of a local seed grower, in 

 which the plants were badly affected by a disease of the 

 leaves and blossoms. Upon the affected leaves first appeared 

 small dead spots, each surrounded by a definite black border. 

 These spots soon increased in size, and in the later stages 

 of the disease the affected leaves had an appearance very 

 similar to that of the violet leaf spot (Cercospora Violw, 

 Sacc). Many plants were killed outright by the disease, 

 and all affected ones were in very poor condition. Besides 

 the spotting of the leaves, many of the blossoms also were 

 affected, the petals being disfigured by dead spots and 

 blotches upon them, while some of the flowers were mal- 

 formed or only partly developed. The latter was indeed one 

 of the most serious features of the trouble, as the plants 

 were raised for seed, and the yield was greatly reduced by 

 this failure of the blossoms to develop properly. 



It was thought at first, from the general resemblance of 

 the leaf spots and close relationship of the two plants, that 



