BULLETIN 278, U. S. DEPARTMENT OF AGEICULTUEE. 



Table X. — Sound and wormy apples from sprayed and unsprayed plats. 

 [Poison test, Benton Harbor, Mich., 1913.] 



Plat 



No. 



Treatment. 



Tree 

 No. 



Condition of fruit. 



AVormy. 



Sound. 



Total. 



Per cent 

 sound. 



I 



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



1 

 2 

 3 

 4 

 5 



129 

 132 

 135 

 157 

 125 



2,144 

 2,490 

 2,244 

 1,850 

 1,927 



2,273 



2,622 

 2,379 

 2,007 

 2,052 



94.32 





Plat total 



94.96 

 94.32 

 92.17 

 93.90 







678 



10,655 



11,333 



94.01 





Arsenate of calcium, homemade (1), at rate of 

 8/10 pound sodium arsenate to 50 gallons lime- 







II 



1 

 2 

 3 

 4 

 5 



398 

 208 

 180 

 254 

 331 



2,767 



1,443 



740 



720 



976 



3,165 



1,651 



920 



974 



1,307 



87.42 





Plat total 



87.40 

 80.43 

 73.92 

 74.67 







1,371 



6,646 



8,017 



82.89 





Arsenate of calcium, homemade (2), at rate of 

 8/10 pound sodium arsenate to 50 gallons lime- 







III 



1 

 2 

 3 



4 

 5 



580 

 388 

 497 

 387 

 260 



2,607 

 897 



1,195 

 955 

 600 



3,187 

 1,285 

 1,692 

 1,342 

 860 



81.80 





Plat total 



69.80 

 70.62 

 71.16 

 69.76 







2,112 



6,254 



8,366 



74.75 





Arsenate of calcium, commercial (paste), Im- 

 pounds to 50 gallons lime-sulphur solution 



Plat total 







IV 



1 

 2 

 3 

 4 

 5 



251 

 241 

 53 

 240 

 303 



813 

 918 

 277 

 681 

 1,025 



1,064 



1,159 



330 



921 



1,328 



76.41 

 79.20 

 83.94 

 73.94 

 77.18 







1,088 



3,714 



4,802 



77.84 





Arsenite of zinc powder, J pound to 50 gallons 







V 



1 

 2 



241 

 83 



2,345 

 978 



2,586 

 1,061 



90.68 





Plat total 



92.17 







324 



3,323 



3,647 



91.11 





Arsenate of zinc, homemade, at rate of 8/10 

 pound sodium arsenate to 50 gallons lime-sul- 







VI 



1 

 2 

 3 

 4 

 5 



365 

 503 

 370 

 213 

 186 



2,342 

 1,867 

 1,731 

 1,386 

 1,951 



2,707 

 2,370 

 2,107 

 1,599 

 2,137 



86.51 





Plat total 



78.78 

 82.15 

 86.68 

 91.92 







1,643 



9,277 



10,920 



84.95 











VII 



1 

 2 

 3 



4 

 5 



927 

 670 

 1,082 

 606 

 933 



877 

 503 

 1.0S6 

 592 

 780 



1,804 

 1,173 

 2, 168 

 1,198 

 1,713 



48.61 





Plat total 



42.88 

 50.01 

 49.41 

 45.53 







4,218 



8,888 



8,056 



47.64 











The arsenate of lead plat produced 94.01 per cent of fruit free 

 from codling-moth injury. Arsenate of calcium, homemade (1), 

 fell below this in its efficiency, the percentage of sound fruit 

 being 82.89. Arsenate of calcium, homemade (2), fell still lower in 

 efficiency, producing 74.75 per cent of fruit free from this insect. 

 Each of these materials burned the foliage very slightly. Arsenate 



