72 MISC. PUBLICATION 4 6, U. S. DEPT. OF AGRICULTURE 



North Carolina Agricultural Experiment Station 1934 (181): 

 Several strains found highly resistant under a variety of conditions. 



Orton 1903 (187) : "Somewhat affected" at the Florida station, but remained 

 free in all trials in South Carolina. 



1913 (188): "Practically immune"; has preserved its vigor and 



resistance perfectly, 11 years; resistance dominant. 



Poole 1933 (198) : High resistance in a strain found near Wilson, N. C. 



and Schmidt 1929 (195) : Generally more resistant than other 



varieties but sometimes severely attacked. North Carolina. 



Rolfs 1907 (201): "Fairly immune"; has been "severely affected . . . 



under certain conditions." 

 Shamel and Cobey 1907 (218): Found resistant in infested tobacco fields 



and recommended for rotation. 

 Taylor 1937: 49 One field about 50 percent infested; commercial seed may 



have become mixed. Georgia. 

 Warner 1937 (2^7): Highly resistant. Florida. 

 Watson 1921 (251): True Iron is usually highly resistant; sometimes 



harbors nematodes. 



and Goff 1937 (258) : Harbors some root knot, which does not 



materially interfere with growth. Florida. 



Webber and Orton 1902 (260): Seems to be "almost absolutely im- 

 mune" under existing conditions. South Carolina. 



The divergence of opinions on the resistance of ' e I -on cowpea seems to be 

 due to differences in the purity of the seed used. his ubject was discussed at 

 the Nashville meeting. 50 Webber and Orton (260) i> itsaw such a difficulty and 

 wrote: "It could probably be brought back to its full degree of immunity by a few 

 generations of seed selection." In this connection note (above) the experiences 

 of Barrons and of Taylor, and the recent selection of strains in North Carolina 

 and other States. Mackie and Smith (153) explain how field hybridization occurs 

 in cowpeas. 



Var. Monetta [Whippoorwill X Iron]. 51 



Collins 1938 (41) : Almost invariably resistant. Rhodesia. 

 Gilbert 1917 (88): Listed as "largely immune." 



Var. "Purple Hull (white)." 



Isbell 1934 (116): Infestation to very light (92 plants, 29.7 percent 

 infested; 2 seasons). Alabama. 



Var. "Six Weeks." 



Isbell 1934 (116): "Free except area" (247 plants, 9.2 percent infested; 2 

 seasons) . Alabama. 



Var. Suwannee. 



Minz 1936 (166): Listed as "resistant." Palestine (?). 



Warner 1937 (247) : Has much resistance to root knot but is not immune. 

 Florida. 



Var. Victor ([Vars. Brabham X Groit; developed by Bureau of Plant Industry]). 

 Barrons 1937: 52 Less resistant than Iron. Alabama. 

 1939 (13) : Numerous larvae entered root tips of seedlings heavily 



inoculated in greenhouse. Alabama. 

 Carns 1937 (82): "Immune" to wilt and root knot; probably the most 



valuable variety tested. South Carolina. 

 Collins 1938 (41):' Not attacked (1 season). Rhodesia. 

 Isbell 1934 (116): Infestation to heavy (157 plants, 46 percent infested; 



2 seasons). Alabama. 

 Kendrick 1929 (121) : 2 to 15 percent diseased (wilt and root knot; 1 season). 



California. 

 McClintock 1922 (145) : Resistant in tests. Georgia. 

 Mackie 1934 (151) : Vigorous and resistant. California. 

 Morse 1920 (168) : As highly resistant as Iron and Brabham. 

 Watson 1929 (256): Found heavily infested "under Florida conditions." 



• See report of Taylor on pp. 116-117 of reference given in footnote 3, p. 6. 

 80 See discussion on pp. 116-117 of reference given in footnote 3, p. 6. 

 11 No longer grown in the United States. 

 « See footnote 41, p. 70. 



