29 



that the amount of late scab is directly proportionate to the amount of early 

 infection. 



In considering the control of leaf-roller and green fruit-worm, as indi- 

 cated by the injured fruit, it should be remembered that the first applica- 

 tions were made several days too late for the most effective results. In 

 regard to the codling moth, the infestation was too slight in this orchard, 



Dust spraying in a New York Apple Orchard — Covering the inner foliage (Original). 



as shown by the number of infested apples in the untreated plot, to make the 

 figures of much value. The table shows however that in the control of the 

 principal chewing insects, the dust mixtures, with the exception of the one 

 containing lime, gave as good or better protection than did the lime-sulfur 

 solution. The reason for the failure of the lime mixture is a question that 

 can be settled only by repeating the experiment another year. 



In all these experiments very careful records were made of the cost of 

 the various materials and of applying them. The details of this record are 

 given in the following table: — 



