CONTROL OF CODLING MOTH IN ARTD REGIONS. 



57 



RELATIVE VALUE OF THE EARLY SPRAYINGS. 



(Fig. 1.) 



Careful tests of the relative value of each of three early sprayings 

 were first made in 1905. The first spraying was applied just after the 

 blossoms fell, the second ten days later, and the third fifteen days 

 after that. Each spraying was toted alone and again in combina- 

 tion with the others and the results compared. The tests were car- 

 ried on in five complete series, three on different blocks of Ben Da vi- 

 and one each on Esopus and Missouri Pippin. All five tests gave 

 similar results, and they are summarized in the following table : 



Table III. — Worms killed in the first hr<><><i by early sprayings. 



c 

 c 



u 



it 



u 

 ft 



V. 



-d 

 a 



z 

 - 



X 



be 



§ 1 



S- 



Total 



number 



of wormy 



apples. 



Number 



of worms 



killed. 



. Percent- 

 age 

 killed. 



Number 

 of apples 



with 

 calyx 

 wormy. 



Percent- 

 ile"- 

 killed. 



Number 

 of apples 



with 



side 

 wormy. 



Percent- 

 al 

 killed. 



72 





 



57 

 64 

 68 

 69 





 



79 

 89 

 94 

 96 



31 





 



84 

 96 

 98 

 99 



41 





 

 76 

 83 

 93 

 95 







1 



"i" 



i 

 i 



1 



15 

 8 

 4 

 3 



5 



1 

 ! 

 1 



10 

 3 



1 

 1 



.... 



In the plat where the third spraying alone was given a few more 

 wormy apples are shown than in the unsprayed block. This of course 

 meant that the third spraying alone was of little value and that the 

 trees happened to average a few more worms than the unsprayed. 

 They were therefore treated as an unsprayed lot and averaged in 

 with this lot to get the 72 wormy. This spray, when applied with 

 the others, killed one more worm: and, strange as it may seem, every 

 set showed this same result, so it should be given full credit for that 

 worm. 



The second spray, when applied alone, killed almost four-fifth- of 

 the worms, and when applied after the first spraying killed half of 

 what would have been left. The first spray proved to be the best, 

 killing almost nine-tenths of the worms when applied alone and 

 when applied with the second killed 04 per cent. 



The difference between the two spraying- was shown in every sel 

 but one, and there they were equal, while the increased value by 

 applying both together was shown in every case. 



WHERE THE WORMS WERE KILLED. 



Examining these results to see where the worm- were killed, we 

 found that of the 15 worms left by the second -praying only 5 went 

 into the calyx: of the 8 left after the first spraying, only 1 went in 

 at that point: and when these two sprayings were combined an aver- 



