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



Var. Brabham [Vars Iron X Whippoorwill; natural cross]. 



Arizona Agricultural Experiment Station 1936 (8): Less resistant than 



velvetbean. 

 Arzberger, E. G. (unpublished manuscript in files of Division of Nematol- 



ogy, Bureau of Plant Industry. 1913) : Suberized and other protective 



tissues better developed than in susceptible varieties. Virginia. 

 Barrons 1937: 41 Less resistant than Var. Iron. Alabama. 

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



inoculated in greenhouse. Alabama. 

 Bessey and Byars 1915 (17): Highly resistant, but subject to injury in 



certain parts of Florida. 

 Clayton 1940 (87a): Sufficiently parasitized to carry over large nematode 



populations. 

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

 Georgia Coastal Plain Experiment Station 1938 (85) : Of only slight value 



for control rotation with tobacco. 

 Godfrey 1928 (93) : Comparative freedom from infestation during early 



growth, galls prominent after 3 months; plants long outlived susceptible 



varieties; illustration. Hawaii. 

 Kendrick 1929 (121): "No evidence of disease" (wilt and root knot; 1 sea- 

 son) . California. 

 Kime 1937: 42 Iron and Brabham have shown more tolerance than other 



varieties. North Carolina. 

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

 Mackie, W. W. (California station; in letter, 1939) : Many highly susceptible 



types have proved to be field hvbrids. 

 Morse 1920 (168): "Immune." 



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

 ties, but sometimes severely attacked. North Carolina. 

 Taylor 1937 : i3 10 to 15 percent infested ; commercial seed may have become 



mixed. Georgia. 

 Warner 1937 (247) : Highly resistant. Florida. 

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



materially interfere with growth. Florida. 

 Var. California Blackeye. 



Isbell 1934 (116): Infestation to very light; almost no injury (159 plants, 



4 percent infested ; 2 seasons) . Alabama. 

 Kendrick 1936 (122) : Susceptible. California. 

 Mackie, W. W. (California station; in letter, 1939): Root knot attacks 



appear to vary with soil and climatic conditions, possibly due to biological 



differences or to complications with fungus diseases. 

 Var. Calva Blackeye [California Blackeye X Virginia Blackeye; developed 

 at California station]. 



California Agricultural Experiment Station 1938 (31): Seems some- 

 what tolerant; strains escape serious injury in all but the most severely 



infested parts of a field. 

 Kendrick 1936 (122): Several strains highly resistant to fusarium wilt and 



to root knot. California. 

 Mackie, W. W. (California station; in letter, 1939): Was grown primarily 



for wilt resistance; has not proved very resistant to nematodes. 

 Var. Columbia [Blackeye variety X Red Whippoorwill; developed by Bureau of 

 Plant Industry]. 



Kendrick 1929 (121): "No evidence of disease" (wilt and root knot; 1 



season). California. 



Var. Conch. 44 



Barrons 1937: 45 A strain tested in Alabama seems "almost immune in the 



adult stage." 

 1938 (12) : The most resistant of the edible cowpea varieties; class 3 in 



seedling test, with a few medium-sized galls; as free in the field as are 



Alabama beans. Alabama. 

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



inoculated in greenhouse; 7 weeks later this series showed "a few very 



small galls." Alabama. 



u See data on resistant varieties of crop plants by K. C. Barrons on pp. 115-116 of reference given in 



footnote 3, p. 6. 



« See remarks by Kime on p. 117 of reference given in footnote 3, p. 6. 



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



44 Sometimes erroneously spelled "Couch." 



45 See footnote 41, above. 



