24 



NKW YORK STATE MUSE CM 



rata so as to present a fair comparison. In the following tabula- 

 tion we have assumed that 400 apples would fill a barrel. This is 

 an approximate figure and equally fair for both the sprayed and 

 the unsprayed trees. 



Comparative results of one spray during four seasons 



TREATMENT 



TOTAL FRUIT TOTAL CLEAN 



WORMY APPLES 



No. Bbls. No 



Bbls. 



End wormy 



No. 



Bbls. 



Per 



cent 



Side wormv 



No. 



Bbls. 



Per 

 cent 



Sorayed ' 169278 



Unsprayed j 169340 



Diierence i 62 



423 

 423i 



165165 



115150 



50015 



412^ 



287I 

 125 



407 I 



22555 S6i 

 22148 55i 



• 353 

 21.73 



21.377 



3516 

 17355 



16839 



48 i 



39j 



2.19 

 18.37 



16.18 



The contrast between sprayed and unsprayed fruit is evident at 

 once from a scrutiny of the above figures. A yield of about 423 

 barrels should, if the trees are well sprayed but once, produce 

 412^ barrels of sound apples, while unsprayed trees bearing an 

 equal amount of fruit, would yield but 287^ barrels of worm-free 

 apples, a difference of 125 barrels. A comparison of the end wormy 

 apples shows at once where most of the efficacy lies, there being but 

 one barrel of end wormy fruit on the sprayed trees, while the 

 others produced 56^ barrels of such apples, a difference of 55/4 

 barrels. There is a marked, though not such a great contrast in 

 the yield of side wormy apples. The sprayed trees, it will be seen, 

 produced but 8% barrels of such fruit, while the unsprayed 

 trees yielded 48^ barrels, a difference of nearly 40 barrels. The 

 same contrasts are also shown in the number of apples and the per- 

 centages of the various grades. 



Results obtained from spraying during the second period. 

 This treatment is given about three weeks after the blossoms fall 

 and is applied at that time because the young caterpillars are then 

 just beginning to feed and enter the fruit. Theoretically, making 

 no allowances for peculiarities in habits, this spraying should give 

 the best results, while as a matter of fact, returns indicate an effi- 

 ciency approximately one-half that of the early treatment. Spray- 

 ing at this time was done only in 1910 and 191 1. The results are 

 tabulated on the following page. 



