CONTROL OF CODLING MOTH IN ARID 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 tesied 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 Davis 

 and one each on P^sopus and Missouri Pippin. All five tests gave 

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



Takle III. — Worms lilU'd in the prst hrood hi/ ciniif spnniiiKjH. 



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, eveiy 

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

 worm. 



The second spray, when applied alone, killed almost four-fifths 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 Avith the second killed 0-t per cent. 



The difference between the two sprayings was shown in every set 

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

 applying both together was shown in every case. 



AVHERE THE W0R:MS WERE KILLEH. 



Examining these results to see where the worms were killed, we 

 found that of the 15 worms left by the second spraying 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- 



