78 N. H. AGR. EXPERIMENT STATION [Bulletin 143 



bagging all the apples (3,92-4) on even one large tree prevented 

 a larger experiment. In 1908 foni- smaller trees with a light 

 crop of fruit were similarly bagged. It is evident, therefore, 

 that the one large tree was fully as fair a test as the four 

 small ones. The one tree gave a benefit for the season of 52 per 

 cent., while the four in 1908 showed only 24 per cent, benefit, the 

 two experiments averaging 38 per cent. Thus, about half of the 

 effect of this spraying must be due to the spray on the foliage, 

 and the balance -must be due to the spray deposited on the 

 apples. It should be pointed out th;it this spray may effectually 

 reduce the number of larv£e entering the calyx though no spray 

 be deposited in the calyx, for we, and others, have observed that 

 very often the larvse eat their way through one of the sepals, 

 rather than going to the apex and entering between them. 



Further than this, any analysis of the large amount of data 

 secured does not enable us to draw any positive conclusions as 

 to just where or how the larvai are killed. The general facts 

 seem quite evident, however, that if the foliage as well as the 

 calyces be thoroughly sprayed by one spraying just after the 

 blossoms drop and a second three or four weeks later, that there is 

 almost an equal chance that the larvae may be killed by eating 

 the foliage or surface of the apple, or by feeding in the calyx, 

 and we would venture the opinion, w^hieh we would not attempt 

 to prove by the statistics, though it is based upon them, that in 

 New Hampshire on the Baldwin apple, about half of the larva? 

 are killed in the calyx and al)out half by feeding on the foliage 

 or surface of the ap|)le. 



6. Effect of Spraying on the Proportion of Dropped and 

 Picked Fruit. The orchard owner is chiefly interested in the 

 effect of spraying on the amount of picked fruit free from 

 worms. In most cases the value of spraying was due to reduc- 

 ing the amount of wormy windfalls, or, in other words, prevent- 

 ing worminess so that the fruit remained on the tree. On the 

 unsprayed trees an average of 26 per cent, of the total fruit 

 dropped as wormy, and 15.7 per cent, was wormy when picked. 



In the four orchards sprayed in 1908, about 28 per cent, of the 

 total fruit was wormy drops on the unsprayed trees and 5 per 

 cent, on the sprayed troes. 



Ah average of all the sprayed plots shows that of the total 



