2 CIRCULAR 72 7, U. S. DEPARTMENT OF AGRICULTURE 



too great to permit its use on the large acreages where wilt usually 

 causes slight to moderate losses. Discovery of strains of tobacco 

 highly resistant to the wilt disease 2 has finally made possible the 

 development of resistant strains of the flue-cured type and of a control 

 measure that is now available and is both effective and easy to use 



(fig. i). 



Figure 1. — A, In this field standard varieties were killed 100 percent by bacterial 

 wilt each year from 1935 through 1944. B, On a part of this same land, a crop 

 of Oxford 26 grown in 1944 produced tobacco at the rate of more than 1,100 

 pounds per acre. 



' Clayton, E. E., and Smith, T. E. resistance of tobacco to bacterial wilt (bacterium solana- 

 CEARUM). Jour. Agr. Res. 65: 547-554, illus. 1942. 



