3° 



REPORT OF THE STATE ENTOMOLOGIST 1 92 1 



Comparative codling moth results, Barker orchard, 1917-20 



Wormy fruit 



PLOTS 



TOTAL 

 FRUIT 



TOTAL 



END 



DEEP 



OR 

 SIDE 



AUGUST 



SHALLOW 



PER 



CENT 



WORMY 



SHOWING 



SHALLOWS 



I 

 I9I7 . 



7 392 



% 



S Hi 



% 



9 021 



% 

 12 047 



% 



I 4OO 



18.93 



368 



720 

 3 076 

 34- 09 

 1 106 



917 



SO 



.69 







2 



.02 











305 



4.13 



80 



1.56 



902 



9-91 



1 154 



12.7 



264 



3-57 



7 



•13 



163 



1.80 



5 



.04 



859 



11.62 



281 



549 



2 009 



22.15 



947 



7.86 



61.35 



I918 



76.36 



1919 



65.31 



1920 



8S.62 







Average 















72.16 



2 

 1917 



8 687 



% 



6 419 



% 

 17 094 



% 



7 341 



% 



I 40S 

 16. 17 

 596 

 9-30 

 3 748 

 21.92 

 I 103 

 15-02 



IS 



.17 

 1 

 

 

 

 

 



194 



2.23 



42 



.65 



427 

 2.49 



113 

 I. 54 



80 



.92 



3 







89 



• 52 



7 



.01 



I 153 

 13-27 



550 



8.56 



3 232 



18.90 



983 

 1352 



82.06 



1918 



92.28 

 86.23 

 89.II 





1920 





Average 















87.42 



3 

 1917 



II 015 



% 



9 248 



% 



15 029 



% 



I 150 



10.44 



656 



7.09 

 3 112 

 20.70 



24 

 .22 

 

 

 

 



149 

 1-35 



54 

 • 58 

 191 



1.27 



14 



• 13 



I 







26 



• 17 



1 027 

 9-32 



631 

 6.84 



2 895 

 19-26 



8930 

 96.19 

 93 02 



1918 



1919 





Average. . . . : 















92.83 



Checks 

 1917 



I 739 



% 



9 36S 



% 



12 586 



% 



4 800 



% 



725 

 41.69 



922 



9.84 



3 348 



26.60 



821 

 16.78 



148 

 8.51 



63 

 .67 



79 

 .62 



22 

 0.4 



254 



14.60 



117 



1.24 



813 



6.45 



298 



. 6.1 



141 



8. 11 



3 



•03 



302 



2-39 



30 



0.6 



332 

 I9.IO 



739 



7 89 



2 118 



16.82 



471 



9-6 



45.79 

 80.15 

 63.20 



56.15 



1918 



1919 



1920 





Average 















61.22 



A comparative study of the data obtained in the Barker orchard 

 for the years 1917 to 1920 inclusive clearly indicates the value of 

 the first or calyx spray and less benefit accruing from the second 

 and third applications respectively, at least so far as the codling 

 moth is concerned. The average of the total wormy fruit for this 

 period, obtained by adding the percentage of each year and dividing 

 by the number of years x is 17.35, 15.60, 12.74 for plots r, 2 and 3 

 respectively while for the check trees it is 23.72 per cent. 



1 This method of obtaining the average percentage more nearly equalizes 

 the results for different seasons and is considered preferable by the author 

 in view of the very great difference in the yields. 



