ONE-SPRAY METHOD FOR CODLING MOTH, ETC. 



101 



Table XII. — Places of entrance of fruit by total larvse of the codling moth for each tree 

 of each plat. Camden, Del., 1911. 



PLAT II. LIME-SULPHUR DEMONSTRATION. 



Total number of larvoe and place of entrance of fruit for each 

 tree, first and second broods combined. 



Total 



for 



plat. 



Percentage 

 of larva? 

 entering 

 at calyx, 

 side, and 

 stem. 



Total 

 number 

 of larva?. 



Place of entrance. 



Tree 

 1. 



Tree 



2. 



Tree 

 3. 



Tree 



4. 



Tree 

 5. 



Tree 

 6. 



First and second broods: 



Calyx 



3 



22 

 2 







39 

 3 



1 

 31 

 3 



1 



6 

 4 



1 



22 



3 





 5 

 1 



6 

 125 



16 



4.08 

 85.03 

 10.89 





Side 





Stem 











Total 



27 



42 



35 



11 



25 



6 1 147 



■ 100.00 



147 











PLAT VII. ONE-SPRAY METHOD. 



First and second broods: 



Calyx 



Side 



Stem 



Total. 



237 



210 



121 



10 



238 



284 



164 

 15 



187 



13 



216 

 35 



264 



65 



1,085 



153 



4.99 

 83.27 

 11.74 



1,303 



PLAT VIII. UNSPRAYED. 



First and second broods: 



Calyx 



Side 



Stem 



Total. 



1,324 

 492 

 248 



2,064 



1,506 

 235 



2,427 



970 

 333 

 206 



1,509 



1,142 

 437 



182 



1,761 



1,472 

 '725 

 268 



2,465 



416 



140 



1,555 



6,593 

 3,909 

 1,279 



11,781 



55. 96 

 33.18 

 10.86 



100. 00 



11, 781 



On the demonstration plat there was a total of 147 larvse; on the 

 one-spray plat, 1,303 larvae; and on the unsprayed plat, 11,781 larvae. 

 The notably greater number on the one-spray plat than on the 

 demonstration plat is probably due to the former being next to the 

 unsprayed plat, as above mentioned, from which moths no doubt 

 migrated during the season. 



A more ready comparison of the efficiency of the treatments of 

 Plats II, VII, and VIII is given in Table XIII. 



Table XIII. — Efficiency of the demonstration and one-spray treatments for the codling 

 moth as shown by the percentage of wormy apples. Camden, Del., 1911. 



Plat No. 



Percentage of wormy apples. 



Total 

 number 

 of wormy 

 apples. 



Total 

 number 



Calyx. 



Side. 



Stem. 



Total. 



of 

 apples. 





0.03 



.36 



31.67 



0.62 

 5.96 

 18.78 



0.08 



.84 



6.15 



0.73 



7.16 



56.60 



147 



1,303 



11,781 



20,068 





18, 184 





20,814 







It will be seen here that the one-spray method was nearly as 

 effective as the demonstration in preventing calyx entrance, the 

 difference in favor of the demonstration treatment being 0.33 per 

 cent. The one-spray method in this case shows considerable pro tec- 



