AGRICULTURAL EXPERIMENT STATION. 95 



would not entirely remove the clanger, as spores of fungi are some- 

 times carried long distances We have seen this rust upon sugar 

 pear (Amelanchier) where there were no cedar trees nearer than a 

 half mile, and they could be carried much farther. 



3. It is probable that this rust is perennial upon quince and 

 apple trees. The disease might, therefore, be introduced upon 

 affected nursery stock and be very bad the first season after the 

 trees are set. The experience of Mr. Dennett could be explained 

 upon the basis that the Fuller, Alaska and Meech Prolific were 

 affected when they came from the nurserj^, while the Orange and 

 Champions escaped because t'lere was no local cause of infection. 

 If this supposition is correct the disease ought to disappear next 

 season if the fungus is annual, or continue and not spread if peren- 

 nial. It is the belief that Rcestelia spores will not spread the dis- 

 ease to other quince and apple trees. We will be much interested 

 in the developments at Mr. Dennett's. There have been no care- 

 fully conducted experiments to prove whether the Rcestelia stage of 

 this disease \s perennial nor so far as we know to show conclusively 

 that Rcestelia spores (fecidiospores) may not produce Roistelia 

 directly. Carefully conducted experiments are needed to settle 

 these points. 



4. It would be well to cut and burn the twigs bea-ing excres- 

 cences before the spores are liberated, and also to destroy all 

 affected fruit. 



DISEASES OF OATS. 



Helminthosporium Inconspicunm, C. & E.Fbr. Britanicum, Grove. 



During the summer of 1893 we received through Mr. Z. A. Gil- 

 bert specimens of oat plants which had turned prematurely yellow. 

 We were informed that this condition was common in certain por- 

 tions of the State. As we were unable to find any fungus at work 

 we concluded as the season icas wet that it was probably a case of 

 malnutrition due to poor drainage and excess of moisture. This 

 season the complaint was renewed by Mr. McKeen. The speci- 

 mens he sent were found to be badly infested by a species of 

 nelminiliosporium which we submitted to Mr. J. B. Ellis who 

 decided that it was the species named at the head of this article. 

 It is described in Saccardo's Sylloge IV, p. 412. The type form 



