ONE-SPKAY METHOD FOE CODLING MOTH. ETC. 



139 



Plat I was left unsprayed for purposes of comparison. Plat II 

 (demonstration block) received four applications in all, the first before 

 blooming but after cluster buds had opened, to protect the fruit from 

 apple scab, which during some seasons in the lake region is very 

 troublesome. Plat III (one-spray block) received the first scab treat- 

 ment of Bordeaux mixture only and an additional treatment with 

 arsenate of lead only at the rate of 1 pound to 50 gallons water imme- 

 diately after the falling of the petals. This treatment was immediately 

 followed by an application of Bordeaux mixture to prevent scab 

 infection, as it was considered unsafe to apply the fungicide so 

 excessively as the one-spray method required in the use of the arsen- 

 ical. Plat III received two subsequent applications of Bordeaux 

 mixture only, as shown in the schedule of applications, to further 

 insure freedom from apple scab. 



THE CODLING MOTH. 



The percentages of wormy and sound fruit for the respective plats 

 for the season are shown in Table XX, and the numbers of trees in 

 the table agree with those in the diagram of the orchard (fig. 37). 



Table XX. — Sound and wormy fruit from unsprayed, demonstration, and one-spray 

 plats. Saugatuck, Mich., 1909. 



PLAT I. UNSPRAYED. 



Condition of fruit. 



Tree 

 1. 



Tree 

 3. 



Tree 



4. 



Tree 



7. 



Tree 

 9. 



Tree 

 10. 



Tree 

 13. 



Wormy 



663 

 3,996 



752 

 5,033 



605 

 2,947 



166 

 1,340 



946 



1,805 



1,207 

 2,676 



416 



Sound 



2,213 







Total 



4,659 

 85.76 



5,785 

 87.00 



3,552 

 82.96 



1,506 

 88.97 



2,751 

 65.61 



3,883 

 68.91 



2,629 



Per cent sound 



84.17 







Condition of fruit. 



Tree 

 16. 



Tree 

 20. 



Tree 

 21. 



Tree 

 26. 



Tree 

 33. 



Total 

 for 

 plat. 



Total 

 per cent 

 sound. 



Wormy 



889 

 1,926 



651 

 2,632 



404 

 1,276 



1,041 

 2,321 



669 

 1,301 



8,409 

 29,466 





Sound 









Total 



2,815 

 68.14 



3,283 

 80.17 



1,680 

 75.95 



3,362 

 69.03 



1,970 

 66.03 



37,875 





Per cent sound 



77. 79 







PLAT II. DEMONSTRATION. 



Condition of fruit. 



Tree 

 101. 



Tree 

 102. 



Tree 

 105. 



Tree 

 106. 



Tree 

 108. 



Tree 

 115. 



Tree 

 117. 



Wormy 



120 

 1,505 



122 

 1,643 



48 

 2,112 



75 

 1,775 



96 

 5,623 



72 

 3,950 



15 



Sound 



5,781 







Total 



1,625 

 92.61 



1.765 

 93.08 



2,160 

 97.77 



1,850 

 95.94 



5,719 

 98.32 



4,022 

 98.20 



5,796 



Per cent sound 



99.74 







