32 BULLETIN 2*78, U. S. DEPARTMENT OF AGRICULTURE. 



Table XVII. — Sound and wormy apples from sprayed and unsprayed plats — Contd. 



Plat 

 No. 



Treatment. 



Tree 

 No. 



Condition of fruit. 



Wormy. 



Sound. 



Total. 



Per cent 

 sound. 



m 



Arsenate of lead (powder), J pound to 50 gallons 



1 

 2 

 3 



97 

 123 

 68 



7,250 

 5,615 

 6,315 



7,347 



5,738 

 6,383 



98.68 





Plat total 



97.85 

 98.93 







288 



19,180 



19,468 



98. 52 





Arsenate of lead (powder) ; J pound combined 

 with commercial precipitated sulphur, 7 







IV 



1 

 2 

 3 



44 

 93 

 82 



5,618 

 8,958 

 7,791 



5,662 

 9,051 

 7,873 



99.22 





Plat total 



98.97 

 98.96 







219 



22,367 



22,586 



99.03 





Arsenate of lead (paste), 1 pound to 50 gallons 







V 



1 

 2 

 3 

 4 

 5 



74 

 39 

 65 

 64 

 76 



6,160 



4,163 

 4,836 

 6,394 

 5,787 



6,234 



4,202 

 4,901 

 6,458 

 5,863 



98.81 





Plat total 



99.07 

 98.67 

 99.01 

 98.69 







318 



27.340 



27,658 



98.13 





Arsenate of lead (powder), 1 pound to 50 gallons 







VI 



1 

 2 

 3 

 4 

 5 



123 

 41 

 79 

 51 



121 



5,043 



6,718 

 5,418 

 7,224 

 7,749 



5,166 

 6,759 

 5,497 

 7,275 

 7,870 



97.62 





Plat total 



99.39 

 98.56 

 99.30 

 98.46 







415 



32,152 



32.567 



98.73 





Arsenate of lead (paste), 2 pounds to 50 gallons 







VII 



1 

 2 

 3 

 4 

 5 

 6 



29 

 12 

 28 

 13 

 26 

 26 



3,777 

 2,399 

 5,146 

 3,833 

 3,972 

 4,757 



3,806 

 2,411 

 5,174 

 3,846 

 3,998 

 4,783 



99.24 





Plat total 



99.59 

 99.46 

 99.66 

 99.35 

 99.46 







134 



23,884 



24,018 



99.44 











vin-x 



1 



2 

 3 

 4 

 5 



6 



7 

 8 



1,548 

 3,208 

 2,342 

 2,432 

 2,635 

 2.385 

 2,902 

 2,312 



3,907 

 5,556 

 5,682 

 4,116 

 3,722 

 1,566 

 2,197 

 1,356 



5,455 

 8,764 

 8,024 

 6. 548 

 6,357 

 3,951 

 5,099 

 3,668 



71.62 





Plat total 



63.40 

 70.81 

 62.86 

 58.55 

 39.64 

 43.09 

 36.94 







19,764 



28,102 



47,866 



58.71 











As will be noted in Table XVII, there is practically no difference 

 from an insecticidal point of view in the effectiveness of the powdered 

 and the paste arsenate of lead. The fruit grower would be justified 

 in using the powdered form if the present difference in cost is con- 

 sidered reasonable for the advantages secured. 



One-fourth pound of the powdered arsenate of lead gave 95.03 

 per cent of fruit free from codling moth against 95.22 per cent where 

 one-half pound of the paste was used. The two plats sprayed with 

 one-half pound of the powder gave 98.52 and 99.03 per cent of sound 

 fruit, respectively, as compared with 98.13 per cent for 1 pound of the 

 paste. One pound of the powder averaged 98.73 per cent sound 



