STATE POMOtOGlCAI, SOCIETY. 67 



parent moths early in the season, and the doctor was in some 

 doubt as to the wisdom of carrying on his work in this orchard, 

 but the year previous, in spite of spraying, we had too large a 

 proportion of wormy fruit, and I was satisfied that there were 

 plenty of the parent moths to give us an abundant crop in a 

 favorable season. The orchard was divided into blocks of 42 

 trees. The first two were Greening, the last two Baldwin. 

 In the center of each of these blocks six trees were selected 

 for the test. The surrounding 36 were all treated in like man- 

 ner. In the first case the pressure was from sixty to eighty 

 pounds with a Vermorel nozzle, throwing a very fine spray. 

 The trees were thoroughly covered, but examination showed 

 little poison in the lower cavity. On the next six center trees 

 the same pressure was used, but a bordeaux or coarse nozzle. 

 Just as thorough work was done, and very much more material 

 was used to cover the tree, and a fezv of the lower cavities were 

 filled. In the next block, from 100 to 125 pounds pressure 

 was used, with the same coarse nozzle. There was not very 

 much difference in the amount of material, in fact a little less 

 than with the smaller pressure, and a larger proportion of the 

 lower cavities were filled. In the fourth block the pressure 

 never went below 160 pounds, and most of the time was at 200 

 with the same coarse nozzle. A large portion of the lower 

 cavities was filled with this heavy pressure and the coarse 

 spray. It is interesting to note that. in this last block of trees, 

 there was one tree for which the speaker is responsible, that 

 while in his eyes from the tower apparently it was well covered, 

 was pronounced by the entomologist on the ground to have a 

 less thorough coating than any of the checked trees. This was 

 noted and the results will appear in the summary. There were 

 also three trees in the orchard left entirely unsprayed. The 

 spray material in every case was three pounds of arsenate of 

 lead with 50 gallons of bordeaux mixture, 3-3-50 formula. 

 In the fall, all the fruit was counted, including the very small 

 amount which fell to the ground, even those stung by plant lice, 

 with the result that on all the trees, in all the blocks, there was 

 from 97 to 98 and a fraction per cent of worm-free fruit, and 

 there was no perceptible difference whether the spray was coarse 

 or fine or the pressure high or low, so long as the tree was 

 thoroughly covered. The one tree referred to above, had the 



