62 MAINE AGRICULTURAL EXPERIMENT STATION. I9I3. 



Plot D was called the "one-fourth weaker" plot as only i 1-4 

 gallons or 25 per cent less of the concentrate than in Plot C was 

 used to each 50 gallons of the spray. 



Plot E was sprayed with 2 pounds of arsenate of lead in 50 

 gallons of water. 



Plot F was sprayed with a 3-3-50 bordeaux mixture. 



Two pounds of arsenate of lead were added to the spray in 

 each case on plots B, C, D and F. All of the sprays were ap- 

 plied with a gasoline power sprayer outfit, using two leads of 

 hose at a time at about 150 pounds pressure. Care was taken 

 to thoroughly w-ash out both the tank and the pump after using 

 each different kind of spray, before putting in the next. The 

 relative position of the plots and the number of trees in each are 

 best shown in the following plan. 



Plan oe Experiment. 













































































































































































































































































■ 































































































































u 







u 



























A 







B 











c 











D 







E 



F 



A. 9 trees, arsenate of lead 4 lbs. to 50 gallons. 



B. 35 trees, lime-sulphur 2 gallons in 50, 2 lbs. arsenate of lead. 



C. 36 trees, lime-sulphur If gallons in 50, 2 lbs. arsenate of lead. 



D. 35 trees, ILme-sulphur ij gallons in 50, 2 lbs. arsenate of lead. 



E. 12 trees, arsenate of lead 2 lbs. to 50 gallons. 



F. 12 trees, 3-3-50 bordeaux mixture, 2 lbs. arsenate of lead. 



As originally planned three applications of the sprays were to 

 be made, the first just as the blossoms were showing pink, the 

 second after the petals fell and the third about three weeks 

 later. The early part of the season was very wet and for sev- 

 eral days before the first application should have been made it 

 rained almost constantly. Partly on this account and partly on 

 account of a misunderstanding on the part of those in charge of 

 the work at that time the first application of the sprays on the 

 experimental plots was delayed so long that the blossoms opened 

 before it could be applied. Fortunately, on the orchard adjoin- 

 ing the plot, where exactly similar conditions existed with re- 

 gards soil, age, variety and condition of the trees, this first 

 application was made just before the blossoms opened. Hence 

 this furnished opportunity to select a plot of trees sprayed three 



