62 EXPERIMENT STATION RECORD. 



The effect of the spraying was especially noticeable in the condition 

 of the sprayed trees and in the greater number of apples that remained 

 upon the trees until the crop was picked. While the reduction in the 

 percentage of rot was small, yet in every case the smaller yield of 

 rotten fruit was from the sprayed tree of each pair. 



The substitution of iron sulphate for the copper sulphate in Bordeaux 

 mixture was tested. In other respects the applications were the same 

 in time and amount. While the test was not wholly satisfactory, the 

 author thinks iron sulphate will be less effective in checking rot than 

 Bordeaux mixture made in the usual way. 



Six apples weighing 420 gm. were tested for the quantity of copper and 

 arsenic present. In the peelings and cores 0.0004 gm. of copper oxid was 

 found with a minute trace iri the iiesh, and of arsenic a trace too small 

 for measurement was found in peelings and cores but none m the flesh. 

 The small quantity of each could not be considered at all injurious. 



Potato blight, L. R. Jones {Garden and Forest, 9 (1896), i\ro. 428, 

 pp. 188, 189. — The author calls attention to the confusion which exists 

 in the nomenclature of the potato blights. The late blight due to 

 Phytophthora infestans is well known, but under the term early blight 

 are confused several distinct conditions. The author states that the 

 early blight proper is due to Macrosporlum solani, and is characterized 

 by the appearance of numerous sharply defined dark spots scattered 

 irregularly over the leaf. These spots, enlarging slowly, give rise to 

 the peculiar arrangement of concentric rings. The spots may or may 

 not have originated with bites of flea beetles, but the fungus is more 

 liable to attack plants that have become weakened from any cause. 



A second form of disease is distinguished from early blight by the 

 name ^'tip burn," and is characterized by drying at the tips and mar- 

 gins. It is attributed to dry hot weather, insufticient water supply, 

 and is aggravated by insect injuries. Numerous fungi are associated 

 with this disease, but they are present as saprophytes. 



A third injury is recognized as due to too strong applications of arsen- 

 ites. The appearance of the spots is very much like that caused by 

 the Macrosporlum, except for more regular outline and slight difference 

 in color. 



A fourth disease is recognized in which dead spots occur on the mar- 

 gins of leaves or around the flea-beetle punctures. They do not seem 

 due to either of the above causes, and are probably caused by too great 

 dry heat. In this respect this disease resembles the disease described 

 • under the name of "tip burn." 



Comparative investigations of the important agricultural smuts, P. Herzberg 



{Beiiratje Physiol, unci Morph. niederen Organismen, 1895, No. 5, pp. 1-S6,pls.3 ; abs.in 

 Bot. Centbl., 6.-7 {1S90), No. 6-7, pp. 231-233). 



Cotton blight (Indian Textile Jour.; Indian Agr., 21 {1896), No. 9, p. 274). 



An outbreak of asparagus rust, B. D. Halsted {Garden and Forest, 9 {1896), No. 

 449, pp. 394, 395).— A description is given of the asparagus rust due to Fiiccinia 

 asparagi, and the burning of all affected plants is recommended as a precautionary 

 measure. 



