204 
places in Jefferson County, the rust in its uredinial stage was abundant 
this year. ‘The rainy seascn in the southern part of the State favored the 
development of the fungus. 
At LaFayette, on the Experiment Station farm, the uredinial stage of 
the rust is abundant in a timothy meadow, which was sown down this 
spring. The rust is most abundant in the low parts of the meadow, and 
even as late as at this writing (Nov. 22nd’) the rust sori are abundant on 
the green blades. 
The vitality of the urediniospores, collected at LaFayette, Ind., Nov. 
22nd, 1910, was tested by means of hanging drops in Van Tiegham cells. 
Spores were taken both from the green blades and from those that had 
been killed by the frost. While the former showed much the more vigor- 
ous germination, the vitality of the spores in both cases proved to be high. 
This shows that they have withstood the cold weather, thus far, very well, 
and points to the probability that the rust may be able to pass the winter 
here in the uredinial stage, as it is thought to do in Europe. 
From the above conditions it seems evident that timothy rust is in 
North America to stay, and its abundance will doubtless vary with the 
varying conditions that favor or check its development. Some of the 
conditions that seem to favor the development of the fungus are a heavy, 
luxuriant growth of the host on ground that tends to hold moisture, along 
with rainy weather with cool nights and moderately still, warm, but not 
hot, days. Obviously, the opposite set of conditions tend to be unfavor- 
able for the greatest development of the rust. 
While the best possible attention to both air and soil drainage will no 
doubt lessen the attacks cf the disease to some extent, yet its ultimate 
control doubtless lies in the field of the plant breeder. The production 
of a strain of timothy having a high resistance to rust, as well as having 
at the same time the best forage qualities, would be of vast importance. 
Purdue University Agricultural Experiment Station, Lafayette, Ind. 
118 F. is the minimum thus far (Nov. 22d) at Lafayette, according to the 
official reading of the U. S. Weather Bureau at this station. 
