PRUNING BEARING APPLE TREES 



15 



The figures in these two tables indicate that with trees in full vigor and produc- 

 tion, a little increase in size resulted from pruning. With old trees declining in 

 vigor, marked increase in size followed pruning. 



Turning now to the reasons why apples fell into the lower grades, Tables 12 

 and 13 give the percentage cf apples placed in lower grades because of poor 

 color, size, scab, and various insect pests. These total more than 100 because of 

 duplicates, seme apples shewing two or more blemishes any one of which would 

 cause the apple to be placed in a lower grade. 



Table 12. — Effect of pruning on reasons for lower grades- 

 Clark Orchard, McIntosh, 1931. 



(Percentage of apples) 



Mechanical. . . 



Color 



Codling Moth, 



Scab 



Maggot 



Curculio 



Red Bug 



Deformitv. . . . 



Table 13. — Effect of pruning on reasons for lower Grades- 

 Clark Orchard, McIntosh, 1934. 



(Percentage of apples) 

 Second Grade Unclassified 



Culls 



Pruned Not Pruned Not Pruned Not 



Pruned Pruned Pruned 



Sprayed Trees 



Mechanical 31.7 41.0 42.0 39.3 43.6 28.3 



Color 30.0 20.8 



Size 57.4 



Scab 38.2 48.4 57.0 64.5 59.1 35.3 



Codling Moth 3.9 6.5 1.6 7.5 4.5 4.3 



Curculio 5.2 12.1 5.2 8.8 15.4 9.4 



Red Bug 0.4 1.5 0.6 0.9 1.9 



Dusted Trees 



Mechanical 33.6 22.9 39.7 46.8 34.7 28.2 



Color 23.7 57.8 



Size 25.0 80.9 



Scab 23.5 26.5 48.9 38.6 27.3 18.9 



Codling Moth 7.5 5.4 6.9 8.9 13.1 4.8 



Curculio 21.5 5.4 21.5 14.9 22.7 8.5 



Red Bug 2.8 1.3 0.7 0.5 



