764 EXPERIMENT STATION RECORD. 



Experiments on the repression of apple scab, in which Baldwin apple 

 trees were sprayed with a 1: 10 Bordeaux mixture, showed slightly 

 better results when 2 applications of the fungicide were made than 

 when a single spraying was given immediately after blossoming. 



Notes are given on a disease of apples and pears characterized by 

 the appearance of dirty or sooty spots on the skin of the fruit. The 

 spots are roundish in outline, varying in size, and often covering nearly 

 or entirely the surface of the fruit. The principal damage caused is the 

 discoloration of the fruit, the fungus being entirely superficial. This 

 disease was most frequently observed on Greenings and Northern Spies, 

 but occasionally was met with on other varieties. Among pears the 

 Beurre de Anjou and Lawrence were most frequently attacked. Spray- 

 ing with Bordeaux mixture is said to have reduced the disease by at 

 least 75 per cent. 



Notes are given on the black knot of plum, as well as suggestions for 

 its prevention by spraying and cutting away diseased portions of the 

 trees. 



Experiments were conducted for the prevention of early blight of 

 potatoes in which the different plats were sprayed 2, 3, and 4 times with 

 1 : 10 Bordeaux mixture. The best results were secured when 3 appli- 

 cations Avere made. 



Experiments were also made for the repression of potato scab in which 

 the seed was soaked in corrosive sublimate solution prior to planting. 

 The different plats were fertilized (1) with commercial fertilizer, (2) with 

 stable manure, (3) with plaster, and (4) with wood ashes. The results 

 obtained show the beneficial effect of treating the seed, but do not fully 

 bear out the statements relative to the effect of fertilizers on scab, the 

 plat receiving stable manure showing the least scab of the series, and 

 that receiving plaster the most. Directions are given for the prepara- 

 tion of Bordeaux mixture and its application. 



Effect of spraying potatoes and of planting at different dates, 

 Duke of Bedford and S. U. Pickering (Rpt. Wobunt Expt. Fruit 

 Farm, 1897, pp. 150-159). — Experiments have been conducted to test 

 the effect of Bordeaux mixture on potatoes during the seasons of 1805 

 and 1896. In neither year was the fungus severe in its attack, and the 

 results secured were correspondingly less than they might have been 

 under other conditions. The spraying in all cases increased the vitality 

 of the potato vines and in 1895 increased the total crop 11.0 per cent, 

 the increase averaging Ki.7 per cent for the late varieties and 0.5 for the. 

 earlier ones. In 1S9G the average gain due to spraying was only 2.8 

 per cent. In this case among the earlier varieties there was an actual 

 loss, AAdiich was attributed to the spraying. In all cases there was a 

 greater percentage of large tubers on the sprayed plats. 



The experiment on the effect of planting at different times was in the 

 majority of cases decidedly in favor of early planting, the average 

 increase being 27 per cent of the total crop. 



