l82 MAINE AGRICULTURAL EXPERIMENT STATION. I915. 



was taken to make the method of application as nearly uniform 

 as possible. A gasolene power sprayer was used, carr}'ing 2 

 leads of hose with each extension rod equipped with 2 nozzles. 

 Approximately 150 pounds of pressure per square inch was 

 maintained. While this pressure is less than that frequently 

 recommended a tine mist was obtained from the nozzles, which 

 appeared to be entirely satisfactory. Care was taken to see that 

 each tree was thoroughly and evenly sprayed at each application, 

 but not enough to cause excessive dripping. After each plot 

 was sprayed the spray tank, pump, hose and extension rod^ 

 were thoroughly rinsed with clean water. 



The first application was begun on Saturday, May 23 and 

 finished on Monday, ]\Iay 25. Conditions during the previous 

 week seemed to indicate that spraying the entire plot might be 

 delayed until the latter date, but toward the last of the week the 

 flower buds began to develop quite rapidly. They were just 

 beginning to show pink on some of the trees on the 22nd. Sat- 

 urday morning, Alay 23, was cloudy with sHght rain. The 

 afternoon being clear it was decided to begin spraying, and 

 applications were made to plots 3 and 4. As has already been 

 stated the remaining plots were sprayed on Monday the 25th. 

 The 24th was clear, but the 25th was more or less cloudy with a 

 slight trace of rain in the evening following. 



The second application was made on June 6, immediately 

 after the petals had fallen, the third on June 22, slightly more 

 than 2 weeks later. 



EFFECT OF THE DIFFERENT SPRAYS ON FOLIAGE AND FRUIT 

 DURING THE SUMMER. 



The development of scab. Xo scab was observed on any of 

 the plots until after June 23. Its first appearance on the fohage 

 occurred between this and June 30, or in the week following 

 the third spray application. On the latter date it was recorded 

 as common on the unsprayed check plot and present to a slight 

 extent on some of the others. The following is a brief sum- 

 mary of the weekly or semi-weekly notes on the development 

 of scab on the foliage and fruit up to the end of the first week 

 in August, along with certain other records made at more or 

 less irregular intervals between this and harvest time. 



