Leaf-spot of Chrysanthemums. 
In the fall of 1891, a leaf spot was quite prevalent on chrysan- 
themums at the Station greenhouse and at other greenhouses in 
the vicinity the same disease was found. The disease first appears 
in small dark brown spots, which increase in size and number till 
the leaf tissue dies and the foliage drops off. In badly diseased 
plants nearly all the leaves wither and fall away. Even when the 
attack is less serious the diseased plants are unsightly and are 
not nearly so vigorous or thrifty as are the healthy plants, which 
hold all their foliage. 
A microscopic examination of affected leaves showed that the 
disease was due to a fungus of the genus Septoria. Specimens 
submitted to Dr. Halsted were pronounced identical with the 
fungus referred to by him in an article on “ Fungous Troubles in 
the Cutting Beds,” published in Garden and Forest, February 24, 
1892. In this article attention was called to the “damping off” 
of chrysanthemums cuttings and severe blighting of the foliage 
due to the same fungous disease. 
The cuttings become infected from the disease on the stock 
plants before they are put into cutting beds and so it is best to 
avoid the use of diseased plants when making cuttings. How to 
secure healthy plants free from the Septoria is a question which 
has_been investigated at this Station during the past year and 
with most favorable results. It has been found that starting with 
diseased plants, the disease can be practically controlled, and we 
have reason to believe that by following the treatment here sug- 
gested, any chrysanthemum grower can secure healthy stock from 
which to grow healthy plants. 
In treating the diseased plants three fungicides were tested. 
These were applied in solution by means of a spray using chiefly 
the Vermorel nozzle because a very fine spray was desired. These 
