380 Bulletin 164. 



Notes on the results at the different dates may be stated thus : 



Apr. 8. — Buds hardly beginning to swell, (ist spraying.) 

 May 10. — Soon after pollination of the flowers ; petals drop- 

 ping, and young leaves out from one-half to one inch long. 

 Even at this time a large number show that the curl is 

 present, by increased reddish coloration, but almost no dis- 

 tortion of surface. Microscopic examination showed that 

 there was yet no fruiting of the fungus. (2d spraying.) 

 May 21. — Curl showing abundantly in the orchard both on leaves 



and twigs ; fungus not yet fruiting. (3d spra3nng.) 

 June I. — Row i, (check). Very bad ; almost every leaf on the 

 tree affected. 

 Row 2, (Bordeaux early). Very good, curl mostly con- 

 fined to some of the tips of growing twigs. 

 Row 3, (Bordeaux late). Very bad ; almost every leaf 



affected. 

 Row 4, (Bordeaux early, Potas. sulf. late). Very good ; 



perhaps slightly more curl than in row 2. 

 Row 5, (Check). Very bad; almost every leaf affected. 

 Row 6, (Potas. sulf. late). Very bad ; a large majority 



of the leaves affected. 

 Row 7, (Bordeaux early, Am. cu. carb. late). Very 



good ; almost equal to No. 2. 

 Row 8, (Am. copper carb. late). Very bad; almost 

 every leaf affected. 

 Particular attention should here be directed to the fact that 

 where Bordeaux mixture was used before the buds swelled, the 

 foliage of the trees was very largel}- entirely free from the curl, 

 even during this first year of treatment ; and this was true 

 irrespective of the mixture subsequently used (compare rows 2, 

 4, and 7). Unfortunately, there was no row which received the 

 first treatment only. 



June 8. — On this date, the time of the last application, the 

 leaves badly affected were falling abundantly. Soon after this 

 time the photograph was taken from which figure 68 is repro- 

 duced. This figure shows the difference between the row sprayed 

 late with Bordeaux, and the row sprayed both early and late 

 with Bordeaux, rows 2 and 3. 



