The Imfhovement of CottoiN by Seed Selection. 509 



\meiica both boll-weevil and pink liollworii) are only too well known. 

 Jiido-inj? by the experience of America and Egypt of these two pe^ts 

 we must niake every effort to keep them out of this country In bad 

 vear^ the loss caused l>v th(> pink bollworm m E-ypt lias been 

 estimated at horn T.oOO.OOO \u 10. 000, 000 .l.dhars. 



Cottun Bolls— showing differences in sluipe and size. 



1st and 2nd rows : bolls from Inipruveil and Green-seeded Bancroft ; 3rd row ; bolls 

 from Kins ; 4th row : bolls from Uganda; .^th row : boll from Egyptian. 



Pink bollworm reached Mexico in 1911, undoubtedly through 

 small importations of seed from Egypt, and seven years later it was 

 estimated that from 50 to To per cent, of the Mexican crop was 

 destroyed by it. It has ah'eadv made its appearance m the United 

 States', and is looked upon there as a far more serious pest than the 



