ONE-SPEAY METHOD FOE CODLING MOTH, ETC. 



143 



Similar comparison may also be made from the data from Arkansas. 

 Thus, on the unsprayed plat (V) for each first-brood larva there were 

 4.8 second-brood larvae. On Plat III (one spray) for each larva of 

 the first brood there were 105.6 larvae of the second brood. Plat I 

 (one-spray method) shows for each first-brood larva 121.5 second- 

 brood larvae. 



To show the comparative efficiency of the demonstation and one- 

 spray treatments in preventing infestation at calyx, side, and stem, 

 Table XXII is presented. 



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

 the percentage of wormy apples . Saugatuclc, Mich., 1909. 



Plat No. 



Percentage of wormy apples .a 



Calyx. 



Side. 



Total. 



Total 

 number^ 

 of wormy 

 apples. 



Total 

 number 

 of apples. 



I. Unsprayed 



II. Demonstration. 

 III. Onespray 



Per cent. 



13.98 



.09 



.13 



Per cent. 

 7.67 

 2.92 

 7.05 



Per cent. 



0.62 



.01 



.09 



Per cent. 



22.20 



2.33 



6.36 



8,409 

 998 



2,738 



37,875 

 42,818 

 42,867 



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

 of these percentages exceeds the total percentage of wormy fruit. 



It is here seen that the two methods of spraying were about equally 

 effective in preventing entrance at the calyx, and that the one-spray 

 method had practically no effect upon side entrance. The demon- 

 stration treatment saved a total of 4.03 per cent of the crop more 

 than the one-spray, practically all of this saving being due to the pre- 

 vention of side entrance. But, as in all the other experiments, the 

 demonstration treatment failed to reduce side entrance to anything 

 like the same degree that calyx entrance was prevented. 



THE PLUM CURCULIO. 



The effects of the applications of sprays on the plum curculio in the 

 E. H. House orchard are shown in Table XXIII. 



Table XXIII. — Injury by the plum curculio for entire season, Plats I, II, and III. 



Saugatuclc, Mich., 1909. 



PLAT I. UNSPRAYED. 



Number of punctured and sound apples, etc., per tree in 

 each plat. 



Tree 

 1. 



Tree 

 3. 



Tree 



4. 



Tree 



7. 



Tree 



Tree 

 10. 



Tree 

 13. 



No. punctures 



No. fruit punctured 



No. sound fruit 



No. fruit 



Per cent free from injury 



1,452 

 866 

 3,793 

 4,659 

 81.41 



422 



214 



5,571 



5,785 



96.30 



506 



220 



3,332 



3,552 



93.81 



505 



241 



1,265 



1,506 



83.99 



1,078 

 480 

 2,271 

 2,751 

 82.55 



756 



372 



3,511 



3,883 



90.42 



141 



56 



2,573 



2,629 



97.87 



