1918 ENTOMOLOGICAL SOCIETY. 81 



both liquid and dust portions on all varieties even on Snow there was less than 

 1 per cent. scab. A Snow tree in a neighbouring orchard across the fence had 

 over 90 per cent, of scab, and Baldwins and Greenings in it averaged about 50 per 

 cent. scab. These trees kad received only the dormant spray for scale. 



The part of orchard A that received only two dustings in addition to the 

 dormant spray were just as free from scab as the part that had received three, thus 

 showing the third application was not required for scab this year. This was 

 generally true in most of the Province. In orchard B the liquid portion had not 

 more than 1 per cent. scab. The dusted part varied greatly, some trees being 

 almost totally free while others of the same variety had as high as 15 per cent. scab. 

 The varieties were chiefly Greening and Baldwin. The average of scabby fruit 

 would net be more than 10 per cent. The crop was very light, only about twenty 

 barrels on six acres, so that the test was not a good one. About three acres of the 

 orchard not in our blocks had received the dormant spray and part of the pre- 

 blossom spray. This part showed from 20 per cent, to 8.0 per cent. scab. 



Results on Sooty Fungus. 



There was practically no Sooty Fungus even in unsprayed orchards in the 

 district. 



Results on Codling Moth. 



Codling Moth this year almost all over the Province was exceptionally 

 abundant and caused more than the usual percentage of wormy fruit. This was 

 partly due to the smallness of the crop with the consequent greater number of larviB 

 attacking the individual apples than if there had been a larger crop and more 

 apples for the worms to distribute themselves among. 



In orchard B where no later spraying or dusting than the regular calyx appli- 

 cation was done, fully 50 per cent, of Baldwins and Kings were wormy, and about 

 25 per cent, of R. I. Greenings. There was very little or no difference in the 

 efficiency of the dust compared with the liquid. Almost every worm in each case 

 had entered through the side. On unsprayed trees in the same orchard the per- 

 centage of wormy fruits varied from 60 to 90, and of these 50 per cent, or more 

 entered by the calyx. 



In orchard A the dust gave Just as good results as the liquid where both parts 

 received only the one application for Codling Moth, but both were quite wormy, 

 having as high as 30 per cent, of the fruit infested. The block of fifty-three trees 

 that had received ji second dusting three weeks after the blossoms fell showed a 

 great improvement over the rest and had not more than 10 per cent, wormy fruit. 



Dusting for San Jose Scale. 



Last year I tried sodium sulphide dust mixed with hydrated lime upon large 

 apple trees before the buds burst as a method of killing San Jose Scale, The work 

 owi-ng to Certain difficulties was poorly done and the results not satisfactory. 



This year I planned to dust four rows of trees, forty-eight trees in each case, 

 with sodium sulphide mixed with talc. Several trees in each plot were badly 

 infested. In orchard B both sides of the trees were dusted, dusting of one side 

 being just after a rain, but the other when the trees were dry. Parts of both sides 

 were re-touched. In all about five pounds per tree were used, so that the mixture 

 was given a goo^c chance. 



