DEVELOPMENT OF WILT-RESISTANT TOMATOES. 



13 



are based on real or apparent resistance, it is quite likely that they 

 refer to apparent resistance. 



Table 4. — Comparative resistance to wilt of several varieties of tomatoes at 

 Thomasville, Ga., in 1919. 



Variety. 



Louisiana Hybrid 



Columbia 



Marvel 



Stone (check) 



Number 

 of plants. 



Percent- 

 age of 

 wilt-free 

 plants in 

 August. 



Variety. 



Norton 



Livingston's Globe (check) . 

 Arlington 



Number 

 of plants. 



Percent- 

 age of 

 wilt-free 

 plants in 

 August. 



The percentages of wilted Norton plants reported for Georgia in 

 1917 by Mr. J. A. McClintock are summarized in Table 5. As not 

 all of these fields were visited, it is quite likely that some of the 

 injury attributed to wilt may have been due to blight or root-knot. 



Table 5. — Comparative resistance to wilt of the Norton and several commercial 

 varieties of tomatoes in Georgia in 1918. 



County. 



Number 

 of experi- 

 menters. 



Size of planting. 



Wilt noted. 



In Norton. 



In checks. 



Ware 



8 

 20 





Per cent. 



5 



2 to 5 



5 



35 



a 20 



2 







Small. 



3 



3 







Per cent. 

 10 to 90 



Colquitt 



do 



75 to 100 





100 





12 

 35 

 14 

 10 

 24 

 12 

 10 

 4 





50 



Chatham 





40 to 75 







50 to 75 





do 



25 to 50 



Bibb 



do : : 



( 6 ) 



85 



Walton 



....do 



Coffee 





10 to 30 







20 









a In one 



instance. 



6 More than Norte 



n. 





The percentages in Table 5, which probably refer to apparent 

 resistance, agree fairly well with those in Table 4. In some in- 

 stances, as in Glynn County, it is quite possible that wilt was not 

 always distinguished from blight or root-knot. For Chatham 

 County only one result is reported, and it is a percentage which is 

 very likely much higher than the average for the 35 tests. But even 

 as the results of these tests are reported, they show that the Norton 

 is much more resistant to wilt than the commercial varieties planted 

 beside it. 



The results reported by Edgerton for Louisiana in 1920 are sum- 

 marized in Table 6. They include data on Edgerton's wilt-resistant 

 varieties, Louisiana Red and Louisiana Pink, and also on several 

 commercial varieties. The percentages are arranged in two columns : 



