ONE-SPRAY METHOD FOR CODLING MOTH, ETC. 



109 



The averages of the percentages of apples wormy at the calyx on the 

 demonstration and the one-spray treatments are practically the 

 same, there being a difference of only 0.3 per cent in favor of the 

 demonstration treatment. The one-spray treatment was about one- 

 third less effective in preventing side entrance than the demonstration 

 treatment. Both methods were effective in reducing entrance at the 

 stem end, the demonstration slightly more so than the one-spray. 



Table XXI. — Efficiency of the demonstration and one-spray treatments against the codling 

 moth as shown by the percentages of wormy apples, Virginia, 1910, Michigan, Delaware, 

 and Kansas, 1911. 



1 The figures under calyx, side, and stem for Fennville are based on the number of entrance holes instead 

 of the number of apples entered. 



For the purpose of comparing the results of the experiments con- 

 ducted in 1910 and 1911 with those conducted in 1909, as to the 

 efficiency of the two methods of treatment as shown by the per- 

 centages of wormy apples, Table XXII is presented. This table 

 shows that the results in the two sets of experiments were practically 

 the same as to protection of the calyx and stem ends of the apple 

 from codling-moth infestation. The one-spray method was less 

 effective in preventing side entrance in 1910-11 than in 1909. 



Table XXII. — Efficiency of the demonstration and one-spray treatments against the cod- 

 ling moth as shoivn by the percentages of wormy apples. Results of experiments in 

 1909 compared with those in 1910-11. 



