58 EXPEKIMENT STATION RECORD. 



tons of limo per acre and frequentl}^ cultivated to a depth of about 3 

 in. yielded, with a basic slag fertilizer, 18 tons, 952 lbs. of roots per 

 acre, and with superphosphate, 11 tons, 308 lbs. of roots per acre. On 

 the basic slag the number of sound roots per pole was 156, and of dis- 

 eased roots, 126. On the superphosi^hate the number of sound roots 

 was 51, and of diseased roots 132. 



Another plat similarly treated in all respects, with the single excep- 

 tion that it was cultivated onh^ occasionally and then to the depth of 

 onl}^ i in., yielded, with slag, 13 tons, 6i4: lbs. of roots per acre, and 

 with superphosphate, 9 tons, 1,901 lbs. On the slag in this case the 

 number of sound roots per pole was 102 and the number of diseased 

 roots 186. On the superphosphate there were only 60 sound roots 

 per pole, Imt 114 diseased roots. "It will be seen that both on the 

 slag and superphosphate halves of the plats the figures are conclusively 

 favorable to the thorough incorporation of the lime with the soil." 



In stuchdng the quantity of lime that should be applied, the plats 

 just referred to, receiving 6 tons of lime per acre, were compared with 

 similar plats receiving 8 tons per acre. The turnips on slag receiving 

 6 tons of lime per acre yielded 18 tons, 952 lbs. of roots per acre, 

 while the plat treated with 8 tons of lime produced only 18 tons; but 

 on the plat receiving 8 tons of lime, more than 5 out of every 6 roots 

 were sound, while on the other plat nearly one-half of the roots were 

 more or less diseased. The figures for the plats receiving superphos- 

 phate were very different, but the general results were the same. The 

 jdelds of turnips on the plats receiving basic slag and those receiving 

 superphosphate, as reported in the first experiment above, are, as 

 already indicated, highly favorable to slag; but when the lime was 

 applied in June instead of in the autumn, as in that case, the amount 

 of 3'ield on the respective plats was reversed, but was in each case 

 nuu'h less than when lime was applied in the fall. 



Tests of kainit and sulphate of iron showed that both were equally 

 powerless to check the disease. Sulphate of copper checked the dis- 

 ease to a small extent. Experiments are now in progress to determine 

 whether the micro-organism causing the disease can survive passage 

 through an animal. 



Apple-tree anthracnose, A. B, Cokdley {Oregon Sta. Bui. GO., 

 pp. S, jjIs. J.) — For several years there has been known in the apple 

 orchards of western Oregon, Washington, and British Columbia a 

 more or less serious disease which is locally known as canker, dead 

 spot, or })lack spot. Investigations on the part of the author have led 

 him to the conclusion that this is an undescribed disease caused by a 

 species of Glceosporium, to which the name G. onalicorticis has been 

 given. In order to avoid confusion, he proposes for this disease the 

 common name apple-tree anthracnose. 



