ONE-SPRAY METHOD FOR CODLING MOTH, ETC, 



119 



to what extent russeting of the fruit might result from so liberal a 

 use of the fungicide. The treatment for Plat III was identical with 

 that for Plat I, except that Vermorel nozzles were used. It was 

 desired to determine the comparative merits of a mist spray as against 

 a coarse spray, and it will be noted that the quantity of liquids required 

 per tree for the mist spray (Plat III) was somewhat less than one-half 

 the amount necessary in the drenching work (Plat I). 



The results presented include all of the drop fruit throughout the 

 season and the fruit from the trees at picking time in the fall. All 

 apples were carefully examined as to worminess from the codling moth 

 and as to injury by the plum curculio and lesser apple worm. Fruit 

 from Plats I and III was badly injured by the apple blotch, which 

 can be accounted for only by the omission of Bordeaux mixture from 

 the treatment given immediately after the falling of the petals. 

 Fruit from Plat II, which had been thoroughly drenched with Bor- 

 deaux mixture using Bordeaux nozzles, was not noticeably more 

 russeted than in the case of fruit from the demonstration plat and 

 was free from apple blotch. Plat IV showed some infection from 

 scab owing to the fact that it had not been sprayed with Bordeaux 

 mixture before the blossoms opened. 



THE CODLING MOTH. 



In Table II are shown results of treatments of Plats I, III, IV, and 

 V as to injury from the codling moth. Plat II is not here considered 

 nor subsequently, as the point involved, namely, the effect on the 

 fruit of a drenching spray of arsenate of lead and Bordeaux mixture 

 after the falling of the petals, has already been indicated. There was 

 not noticeably more russeting of the fruit on Plat II than on Plat IV 

 which received the demonstration treatment. 



Table II. — Sound and wormy apples from one-spray, demonstration, and unsprayed 

 plats. Siloam Springs, Ark., 1909. 



PLAT I. ONE SPRAY (BORDEAUX NOZZLES). 



Condition of fruit. 



Condition of fruit. 



Tree 1. 



Tree 2. 



Tree 3. 



Tree 4. 



Tree 5. 



Tree 6. 



Tree 7. 



Tree 8. 





703 



4,986 



522 

 4,291 



419 

 3,377 



118 

 2,632 



181 

 3,265 



222 

 3,540 



286 

 3,021 



315 





5,128 





Total 



5,689 

 87.65 



4,813 

 89.16 



3,796 

 88.97 



2,750 

 95.71 



3,446 

 94.74 



3,762 

 94.19 



3,307 

 91.36 



5,443 





94.22 







Wormy 



Sound 



Total.... 

 Per cent sound 



Tree 



110 



,489 



3,599 

 96.95 



Tree 10. 



113 

 2,539 



2,652 

 95.71 



Tree 11. 



131 

 3,764 



Tree 12. 



Tree 13. 



Total for 

 plat. 



3,120 

 40,032 



43, 152 



Total 

 per cent 

 sound. 



92.76 



30490°— Bull. 80—12- 



