REPORT OF THE STATE ENTOMOLOGIST I9IO I5 



high and 30 feet apart. The actual experimental trees were northern 

 spy. Each plot consists of 42 trees, six trees in a row one way and 

 seven in a row the other way, the central six being the actual 

 experimental trees. These were carefully selected for uniformity 

 in size, fruitage and infestation. There was a large crop of Baldwin 

 apples in this orchard last year and some of the northern spys 

 produced a fair yield. The check trees of the two plots in this 

 orchard were located in the same north and south rows of trees 

 near the western edge of the orchard, and were some little distance 

 north of the road. Plots i and 2 were still further north. These 

 two plots were thoroughly sprayed May 12, 1910 with seven pounds 

 of arsenate of lead (15 per cent arsenic oxide) to each 150 gallons of 

 spray, together with one gallon of a homemade concentrated lime- 

 sulfur wash (Cordley formula, testing probably from 30 to 31° 

 Baume) to each 25 or 30 gallons of spray. The day was dry, 

 nearly quiet and conditions were almost ideal. The pressure was 

 maintained at from 100 to 150 pounds. Friend nozzles being em- 

 ployed and 150 gallons of spray sufficing for about 105 trees. All 

 of the spraying was from the ground, the hose being tied to poles 

 and the nozzles set at an angle so as to discharge almost directly 

 into all the blossoms. The application was sufficiently thorough to 

 cover practically all of the foliage in a very uniform manner. The 

 trees were fairly well fruited and had just completed blossoming. 



The second application was made on plot 2 June 2d. The day 

 was cloudy, with a strong southwest wind and, as a consequence, 

 the spray was applied from only one side, the eastern portion of 

 the trees not being well covered, though special attention was given 

 to the center where the greater portion of the fruit was located. 

 The formula for the spray was practically the same as in the preced- 

 ing application; 140 gallons were necessary to spray the plot of 42 

 trees. The fruit ' was in fine condition and the foliage had made 

 excellent growth since the earlier application, which was plainly 

 evident. At this time there were no signs of codHng moth work. 



An examination of this orchard June 30th showed a very gratify- 

 ing condition. The check trees were in excellent foliage and already 

 exhibited a markedly greater codling moth infestation. Plot i, 

 which received but one spraying, showed practically no wormy fruit 

 and no signs of injury to the foliage. The same was true of plot 2 

 which was sprayed twice. 



