
New York AGRICULTURAL EXPERIMENT STATION. 559 
When the plants were selected for this experiment every leaf 
was examined and counted and the per cent. of leaf surface 
\ 
injured by the disease was estimated for each class as follows: 
Per cent. of | Percent. of in- 
Number of plants plainly | jury to leaf 
plants treated.| attacked by | surfaceofthe 
the disease. entire class. 
Pessproeaux mixture ..... 006.9%. 28 0S OBOTT 15.9 
2. Ammoniacal solution of copper | 
BI IA UO an sir v ole ns 81s gd or 33 36.6 10.7 
MERUOALOM (76. 5 os ke a oe alee bole 20 23.4 6.8 


When the plants were in bloom a final estimate of the amount 
of injury to these plants from the Septoria gave the following 
results: | 
| 

oo 


Per cent. of | Per cent. of in- 
Number of plants plainly| jury to leaf 
plants treated.| attacked by} surfaceofthe 
the disease. entire class. 


me epordeaux mixture .. 2.422.044; 24 100 “28 
2. Ammoniacal solution of copper 
PMPIAVALO 10) ecg \ ecardiole sac e bik BY 100 11.6 
Pemerereated *... Lec. sec oe ce vet 20 | 100 35.5 

By comparing the per cent. of leaf surface injured by the dis- 
ease before treatment, with the per cent. of diseased foliage at 
the close of the experiment, it is seen that at the beginning of 
the experiment the Bordeaux treated plants were in the worst 
condition, while at the close they were in the best condition, 
having gained 10.6 points as compared with their condition at the 
beginning, and in the same period the plants treated with 
ammoniacal solution of copper carbonate gained 0.9 of a point 
and the untreated plants lost 24.7 points. Plants treated with 
-ammoniacal solution of copper carbonate therefore gained 25.6 
points as compared with the untreated plants, and those treated 
__ with Bordeaux mixture gained 35.2 points as eompared with the 

