ONE-SPRAY METHOD FOR CODLING MOTH, ETC. 



97 



Table VIII. — Places of entrance of fruit by total larvae of the codling mo 'h for each free 

 of each plat. Fennville, Mich., 1911 — Continued. 



PLAT V. UNSPRAYED. 



Total number of larvae and place of entrance of fruit for each tree; first 

 and second broods combined. 



Total for 

 plat. 



Percentage 

 of larvae 

 entering at 

 calyx, side, 

 and stem. 



Total 

 number 



Place of entrance. 



Tree 3. 



Tree 4. 



Tree 5. 



of larvae. 



First and second broods: 



Calyx 



577 



553 



99 



856 

 574 

 139 



1,022 

 593 

 116 



2,455 



1,720 



354 



54.21 



37.98 

 7.81 





Side 





Stem 









Total 



1,229 



1,569 



1, 731 



4,529 



100. 00 



4,529 





As shown in the above table, the total number of larvae on Plats 

 I, III, and V were 301, 977, and 4,529, respectively. The unsprayed 

 plat (Plat V) may be taken to indicate the normal behavior of the 

 larvae and shows that 54.21 per cent of the total larvae of both broods 

 entered the calyx end of the apples. In case of the sprayed plats, 

 as would be expected, the proportion entering at the calyx is greatly 

 reduced, and there is a corresponding increase in the proportion 

 entering the fruit at the side and stem. The demonstration plat 

 shows 13.62 per cent of total larvae entering at the calyx end as 

 compared with 6.65 per cent in the one-spray plat. Comparing the 

 percentage of larvae entering at the stem end of the apple it will be 

 noted that this percentage on Plat I is 1.99, as compared with 3.38 

 per cent on the one-spray plat. It would be expected that this 

 difference would be due to the protection of the stem end of the 

 apple by the later applications of poison on the demonstration plat, 

 and this is probably a correct conclusion. However, by referring to 

 the foregoing table it will be seen that in the case of Plat IV, the 

 Bordeaux-demonstration plat, 4.02 per cent of larvae entered at the 

 stem end. 



The efficiency of the one-spray and demonstration treatments in 

 preventing worminess is shown in condensed form in Table IX. 



Table IX. — Efficiency of the demonstration and one-spray treatments as shown by the 

 percentage of wormy apples . Fennville, Mich., 1911. 



Plat No. 



Percentage of wormy apples. 1 



Total 

 number 

 of wormy 

 apples. 



Total 

 number 



Calyx. 



Side. 



Stem. 



Total. 



of 

 apples. 





0.96 



.86 



25.62 



5.98 

 11.64 

 17.95 



0.14 



.44 



3.69 



7.08 

 12.94 

 47.26 



271 



683 



3,081 



3,825 





5,275 





6,518 







i Each entrance was counted in determining the percentages for calyx, side, and stem, so that the sum 

 of these percentages exceeds the total percentages of wormy fruit. 



