STATE POMOLOGICAL SOCIETY. 47 



have been made with a gasoHne power sprayer, using a nozzle 

 which gave a fine mist and with pressure varying from 150 to 

 200 pounds. 



Results and Conclusions. 



Bordeaux mixture vs. lime-sulphur. Each year a plot has 

 been sprayed with a 3-3-50 Bordeaux mixture and another 

 with standard dilution lime-sulphur to which in both instances 

 two pounds of paste arsenate of lead or one pound of the 

 powdered form was added to each 50 gallons. For the past 

 few years dry arsenate of lead has been used exclusively from 

 preference. These two plots provide a base line or check 

 whereby, in connection with a third unsprayed plot, the effects 

 of the other treatments in preventing scab and in the production 

 of fruit russeting and foliage injury could be determined more 

 accurately. They have also given some very illuminating data 

 as to the relative merits of the two sprays when used upon a 

 variety of apples which is particularly susceptible to spray injury 



Lime-sulphur has sometimes given a little leaf injury but 

 never sufficient to be of any commercial importance. When 

 compared with the unsprayed check plot this treatment has 

 increased the number of russeted apples from five to ten per cent 

 during the past three years. Scab control has been less than 

 with Bordeaux mixture but the greatest difference has been only 

 about three per cent. 



Bordeaux mixture on the other hand has caused serious leaf 

 injury nearly every year for the past six seasons, sometimes 

 resulting in partial defoliation. The greater efficiency in scab 

 control has been discounted several times over by the increase 

 in fruit russeting. The method of treatment which gives the 

 greatest proportion of merchantable fruit is the one which 

 appeals to the practical man. In the past three years the per 

 cents of merchantable apples on the plat sprayed with Bordeaux 

 mixture have been in round numbers 30, 10 and 21. The 

 unsprayed check which was not even treated with an insecti- 

 cide gave 30, 87 and 91 per cent of the same grade of fruit. 

 From the practical man's standpoint nothing was gained the 

 first year and there was a heavy loss the next two years in 

 spraying Ben Davis trees with Bordeaux mixture. It is true 



