30 



REPORT OF THE STATE ENTOMOLOGIST I92I 



Comparative codling moth results, Barker orchard, 1917-20 



Wormy fruit 



PLOTS 



TOTAL 

 FRUIT 



TOTAL 



EKD 



DEEP 

 OR 



SIDE 



AUGUST 



SHALLOW 



PER 



CENT 



woR^^Y 



SHOWING 

 SHALLOWS 



19I7 



7 393 



% 



S III 



% 



9 021 



% 

 12 047 



I 400 



18.93 



368 



7.30 



3 076 



34 09 



1 106 



9.17 



50 



.69 











2 



.02 











30s 



4.12 



80 



I..S6 



902 

 9.91 

 I 154 

 12.7 



264 



3-57 



7 



•13 



163 



1.80 



S 



.04 



8S9 



11.62 



281 



5-49 



2 009 



22. IS 



947 



7.86 



61.3s 



igi8 



76.36 



1919 



65.31 



1920 



85.62 







Average 















72.16 



2 

 I917. . . . 



8 687 

 % 



6 419 



% 



17 094 



% 



7 341 



% 



I 40s 

 16. 17 

 596 

 9 30 

 3 748 

 21.92 

 I 103 

 15.03 



IS 



.17 



1 

 





 

 

 



194 



2.23 

 42 



•6S 

 427 



2.49 

 113 



I 54 



80 



.92 



3 







89 



■ 52 



7 



.01 



I 153 



1327 



SSO 



8.56 



3 232 



18.90 



983 



13.52 



82.06 



I918 



92.28 



I9I9 



86.23 



1920 



89.11 







Average 















87.41 



3 

 1917 



II 015 



% 



9 248 



% 



15 029 

 % 



I ISO 

 10.44 

 6s6 

 7.09 

 3 113 

 20.70 



24 



. 22 

 

 





 



149 



1-35 



54 



■58 



191 



1.27 



14 



• 13 



I 







26 



•I7 



1 027 

 9-32 



631 

 6.84 



2 895 

 19.26 



89 30 

 96.19 

 93 02 



1918 







Average 















92.83 



Checks 

 igiy 



I 739 



% 



9 36s 



7o 



12 586 



% 



4 890 



% 



72s 

 41.69 



922 



9.84 



3 348 



26.60 



821 

 16.78 



148 



8.51 



63 



■ 67 



7Q 



.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 

 19.10 



739 



789 



3 118 



16.82 



471 



9.6 





1918 



1919 



1920 



80. IS 

 63 . 20 

 56.15 



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 ^ is 17.35, 15.60, 12.74 for plots r, 2 and 3 

 respectively w^hile for the check trees it is 23.72 per cent. 



* This methtod of obtaining tlie average percentage more nearly equalizes 

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

 in view of the very great difference in the yields. 



