ORCHARD SPRAYING EXPERIMENTS IN I912. 61 



mixture was used over 70 per cent of the apples were so affected- 

 while on the other plots this was not over 2 per cent in any 

 case and the amount was fairly uniform, regardless of the kind 

 and strength of the spray. 



The 1912 Experiments. 



In 1912 the apple spraying experiments were again trans- 

 ferred to the Department of Plant Pathology. When the first 

 two applications of the spray were applied in the experiments 

 which will be described the Station pathologist was on a leave 

 of absence, otherwise an unsprayed check-plot would have been 

 saved for comparison. That part of the work which was pri- 

 marily concerned with the fungicidal value of the different 

 sprays was an exact duplicate of that carried out the season 

 before, but as has already been pointed out the weather condi- 

 tions of the summer of 1912 were much more favorable to the 

 test. 



In this experiment there were used 139 Ben Davis trees, about 

 twenty-five years old and which constituted a block at one 

 corner of the most thrifty orchard on the farm. This is the 

 same block of trees which was used in 1910 and 191 1 experi- 

 ments. Previous to 1909 this orchard, like the others on the 

 farm, had been much neglected, although it showed some evi- 

 dence of previous cultivation and had also been used for a sheep 

 pasture in recent years. For the past three years it has been 

 well fertilized and has been thoroughly cultivated each year. 

 It is now in a quite thrifty condition. The block was divided 

 into six difl:"erent plots. 



Plot A was sprayed with arsenate of lead 4 pounds in 50 gal- 

 lons of water. 



Plot B was sprayed with home-cooked lime-sulphur, 2.j° 

 Beaume density 2 gallons, in water sufficient to make 50 gallons. 

 This was called the "one-fifth stronger" plot as the spray car- 

 ried 20 per cent more of the concentrate than is commonly 

 recommended. 



Plot C or the "standard dilution" plot was sprayed with I 2-3 

 gallons of the same lime-sulphur concentrate, diluted with water 

 to make 50 gallons. This is the same dilution as is used on the 

 general orchards on the farm. 



