REPORT OF THE STATE ENTOMOLOGIST I912 



27 



in the number of plots or a reduced number of trees in the 

 plots and the figures thus indicate fair comparative values. We 

 have not included in this the returns from one spray during 1912, 

 since there would be no material gain were this done as the figures 

 are very nearly the same, and furthermore such inclusion would 

 result in a disproportionate representation of trees receiving but one 

 application. The figures in the tabulation given below for the plots 

 sprayed three times are undoubtedly somewhat higher than they 

 should be because there were none sprayed three times in 1910, a 

 year when the second brood of the codling moth was extremely 

 abundant and excessively injurious. 



Comparative tabulation of yields for 1909-11 





TOTAL 

 FRUIT 



CLEAN FRUIT 



WORMY FRUIT 



NUMBER OF SPRAYS 



Num- 

 ber 



Per 

 cent 



Total 



Total 

 end 



wormy 



Total 

 side 



wormy 



Total 



end 



and 



side 



wormy 



I 



2 



3 . 



I late 



Checks 



98855 

 93766 

 IO415I 

 66756 

 98952 



96117 

 91564 

 91863 

 51722 

 68064 



97.23 

 97.65 

 99.22 

 77.47 

 68.78 



2738 



2202 



807 



15034 



30888 



389 



289 



272 



8184 



20730 



2459 



1997 



596 



8848 

 17988 



no 



84 



50 



1998 



7833 



Comparative savings as a result of spraying igog-ii 



TREATMENT 



WORMY APPLES 

 ELIMINATED 



No. 



Bbls. 



No. 



Bbls. 



END WORMY 

 ELIMINATED 



No. 



Bbls. 



No. 



Bbls. 



1 spray .... 



2 spray .... 



3 spray .... 

 I spray, late 



28150 

 28686 

 30081 

 15854 



70i 

 7ii 

 75 

 392 



536 

 1395 



2l 



20341 

 20441 

 20458 

 12546 



50f 

 51 

 SI 

 3li 



100 



17 



A study of the above data brings out the relative value of the 

 various sprays in a somewhat different manner. Taking the check 

 or unsprayed trees with their 98,952 apples or approximately 247^ 

 barrels as the standard, we find that one spraying in the first period 

 reduces the number of wormy apples by 28,150 (70^4 barrels) or 

 end wormy alone by 20,341 apples (50^ barrels). The one late 

 spraying three weeks after blossoming, takes 15,854 apples (39^ 



