CONTROL OF CODLING MOTH IN ARID REGIONS. 



59 



RESULTS or SPRAYINGS IX THE SECOND BROOD. 

 (Fig. 2.) 

 Table IV. — Worms killed in the second hrood by early sijruyinys. 



The results of spraying in tlu> second brood are an almost e.xact 

 duplication of those in the first, Avith 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 spra^'ings 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 (juestion 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 1^ per cent 

 of wormy fruit for the year remaining after two sprayings. 



VALUE OF TWO EARLY SPRAYIN(.S. 



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 1905 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. 



