26 



BULLETIN 959, U. S. DEPARTMENT OF AGRICULTURE. 



Table 18. — Treatment of plats for the codling moth, Red Cross orchard, Grand Valley of 



Colorado, 1918. 



No. of 

 plat. 



II.. 

 III. 



IV. 



v.. 



VI.. 

 VII. 



VIII. 

 IX.. 



X.. 



XI.. 

 XII. 



Spray materials and supplemental control measures. 



Arsenate of lead, powder, 1 pound — 50, and codling- 

 moth traps. 



Arsenate of lead, powder, 1 pound — 50 



Arsenate of lead, 1 pound — 50, fish-oil soap, 2 pounds — 

 50, and codling-moth traps. 



Arsenate of lead, 1 pound — 50, end fish-oil soap, 2 

 pounds — 50. 



Arsenate of lead, powder, 1 pound — 50, and codling- 

 moth traps. 



Arsenate of lead, powder, 1 pound — 50 



Arsenate of lead, 1 pound — 50, fish-oil soap, 2 poimds — 

 50, and codhng-moth traps. 



Arsenate of lead, 1 pound — 50, and fish-oil soap, 2 

 pounds — 50. 



Arsenate of lead, J pound — 50, and flsh-oU soap, 2 

 pounds — 50. 



Arsenate of lead, ^ pound — 50 



Check — unsprayed 



do 



Spraying equipment. 



Calyx spray. 



Spray poles and 

 "Bordeaux noz- 

 zles. 



....do 



....do 



-do. 

 .do. 



.do. 

 .do. 



.do. 



.do. 



.do. 



Cover sprays. 



Spray poles and 

 whirlpool disk 

 nozzles. 



Do. 



Do. 



Do. 



Do. 



Do 

 Do. 



Da 



Do. 



Do 



Table 19. — Spraying schedule for the codling moth, Red Cross orchard, Grand Valley of 



Colorado, 1918. 





Calyx 

 spray. 



Cover sprays — first brood. 



• 



Cover sprays— second 

 and third broods. 



No. of plat. 



A. 



B. 



C. 



D. 



E. 



■F. 1 G. 





Petals off. 

 May 10-14. 



3 to 4 



weeks after 



A, June 



3-5. 



9 days 



after B, 



June 



12-13. 



12 days 



after B, 



June 15-17. 



11 days 



after C, 



June 23-24. 



8 to 9 



weeks after 



A, July 



8-11. 



35 days 



after F, 



Aug 12-15. 



I 



First 



.do. . 



Second — 

 ...do 



Third 





Fourth.... 

 ...do 



Fifth 



...do 



SLxth. / 

 Do. -^ 



II 



...do 





III 



...do 



...do 



...do 





...do 



. . .do 



Do. 



IV . 



do 



-do. ... 



...do. . . 





...do 



...do 



Do. 



V... 



.do. . 



...do 





Third 





Fourth.... 

 ...do 



Fifth. 



VI 



..do. ... 



...do 





...do 





Do. 



VII . 



do 



do. . 





.do. . 





.do 



Do. 



VIII... 



-do- . • 



.do. . . 





.do 





. .do 



Do. 



IX 



..do. ... 



...do 





...do 





...do 



Do. 



X 



...do 



...do 





...do 





...do 



Do. 



XI 



Check. 















XII 



...do 































The results of these experiments are summarized in Table XX. 

 The best results were obtained in plat IV in which 77.36 per cent of 

 the fruit was free from worms and 60.36 per cent was free from both 

 worms and stings. This plat was sprayed six times with arsenate 

 of lead and fish-oil soap. Plat III, which had a like number of 

 applications of the same materials and in addition was provided 

 with the codling-moth trap, yielded 71.80 per cent of fruit free from 

 worms and only 42.78 per cent free from both worms and stings. 

 None of the other plats produced satisfactory commercial returns, 

 and in plat VIII, which was sprayed five times with arsenate of 

 lead and fish-oil soap, but 21.23 per cent of fruit was free from 



