CONTROL OF CODLING MOTH IN ARID REGION-. 



59 



RESULTS OF SPRAYINGS IX THE SECOND BROOD. 

 (Fig. 2.) 

 Table IV. — Worms killed in the second brood by early sprayings. 



be 



- 



I 



- 



- 

 a 



z 

 ■~ 



02 



>. 



5 



— 



•a 

 H 



Total 

 number 



of 

 wormy 

 apples. 



Number 



of 

 worms 

 killed. 



Percent- 

 age 

 killed. 



Number 



of 



apples 



with 



calyx 



wormy. 



Percent- 

 age 

 killed. 



Number 



of 

 apples 



with 



>i<le 



wormy. 



Percent- 

 age 

 killed. 



216 











96 



138 



168 



168 











44 



64 



78 

 78 



101 





 

 59 

 92 

 97 

 96 



115 



8 



31 

 39 



61 



62 







1 



i 



1 



120 

 78 

 48 

 48 



41 

 8 

 3 



4 



79 

 70 

 45 

 44 



1 

 l 



1 

 1 



"i" 



The results of spraying in the second brood are an almost exact 

 duplication of those in the first, with the number of worms to be 

 killed trebled and the killing power somewhat reduced, the reduction, 

 however, being almost entirely in the killing of the worms infesting 

 the fruit at the side. 



It is hard to believe that two sprayings applied before June 10 

 could kill over three-fourths of the worms appearing in August and 

 September, but the results are so uniform throughout each set that 

 there can be no question about their general accuracy. 



These results were obtained on trees averaging about 3,500 apples 

 apiece: so the 4 worms escaping in the first brood together with the 

 48 in the second would make a total of almost exactly \\ per cent 

 of wormy fruit for the year remaining after two spraying-. 



VALUE OF TWO EARLY SPRAYINGS. 



The question of the value of two early sprayings was taken up first 

 in 1904 and the results published in Bulletin 95 of the Utah Station. 

 The comparative value of the two early sprayings in 1005 has been 

 shown in the previous table. Some of the plats, however, did not 

 contain trees enough for a complete test and so were not included in 

 the first set. 



