34 BULLETIN" 278, U. S. DEPARTMENT OF AGRICULTURE. 



Table XVIII. — Sound and wormy apples from sprayed and unsprayed plats — Contcl. 



Plat 



No. 



Treatment. 



Tree 

 No. 



Condition of fruit. 



Wormy. 



Sound. 



Total. 



Per cent 

 sound. 



V 



Arsenate of lead (paste), 2 pounds 4- commercial 

 barium tetrasulphid 5-50. 



Plat total 



1 

 2 

 3 

 4 

 5 



806 

 450 

 216 

 258 

 328 



9,224 

 7,864 

 6,988 

 7,107 

 10, 340 



10, 030 

 8,314 

 7,204 

 7,365 



10, 668 



90.97 

 94.59 

 97.00 

 97.85 

 96.91 





2.058 



41,523 



43,581 



95.28 





Arsenite of zinc (paste), 1£ pounds + Bordeaux 

 mixture 4-4-50. 



Plat total 



1 

 2 

 3 





VI 



42 

 29 

 27 



3,982 

 5,121 

 3,231 



4,024 

 5,150 

 3,258 



98.96 

 99.44 

 99.17 





98 



12,334 



12,432 



99.21 





Arsenite of zinc (paste), li pounds + stone lime, 2 

 pounds, to 50 gallons lime-sulphur solution. 



Plat total 



1 



2 





VII 



347 



244 

 274 



4,092 

 5,478 

 5,885 



4,439 

 5,722 

 6,159 



92.18 

 95.74 

 90.68 





865 



15,455 



16,320 



94.70 





Arsenate of zinc (homemade), sodium arsenate 

 crystals, ^ pound, to 50 gallons lime-sulphur so- 



1 



2 

 3 





VIII 



221 



167 

 309 



3,654 

 3,544 

 5,306 



3,875 

 3,711 

 5,615 



94.30 

 95. 50 

 94.50 





Plat total 







697 



12,504 



13,201 



94.72 







1 



2 

 3 



4 

 5 

 6 



7 

 8 





IX- 



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 



XI 



Plat total 



63.40 

 70.81 

 62.86 

 58.55 

 39.64 

 43.09 

 36.94 





19,764 



28,102 



47,S66 



5S.71 











Arsenate of lead gave satisfactory control of the codling moth 

 when combined with lime-sulphur, commercial precipitated sulphur, 

 and commercial barium tetrasulphid. In combination with com- 

 mercial sodium sulphid,lead arsenate held the codling moth in check, 

 but caused considerable foliage injury and defoliation due to the 

 formation of soluble sodium arsenate. The addition of lime lessened 

 the foliage injury somewhat. 



Arsenate of zinc, when added to lime being slaked for Bordeaux 

 mixture, was effective and caused no foliage injury. Arsenite of 

 zinc added to slaking lime and then mixed with lime-sulphur solution, 

 and likewise arsenate of zinc (homemade) combined with lime- 

 sulphur solution, were slightly less effective than the other arsenical 

 combinations. 



Experiment XIX. 



COMBINATION SPRAYS — COMPATIBLES AND INCOMPATIBLES. 



Combination sprays for the control of apple chewing and sucking 

 insects and fungous diseases were tested in the experimental orchard. 

 Arsenate of lead with nicotine solutions and lime-sulphur solution is 

 a compatible mixture and will give satisfactory results if the applica- 

 tion is timely: 



