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



Nicotiana nudicaulis. 



Clayton 1940 (37 a) : Highly resistant or immune. 

 Nicotiana repanda. 



Clayton and Foster 1940 (88): Highly resistant (experimental). 

 Nicotiana rusbyi, see N. tomentosiformis. 

 Nicotiana rustica, Aztec tobacco. 



Ferrari 1939 (62): Var. Brasilia (?: "Brasile del Grappa") observed to be 

 relatively resistant at Scafati (tested 1 year). Italy. 



Nicotiana tabacum, common tobacco. (N, S) 



Clayton 1938: 84 Resistant varieties from Central America used in breeding 

 program; several types show little evidence of infestation, other types 

 show abundant galls which seem not to injure the plant because they are 

 small and do not decay. 



1940 (87a): Varying degrees of resistance found; in certain lines, 



like White Honduras, nematode resistance is linked closely with unde- 

 sirable growth characters; other lines, apparently homozygous, with a 

 marked degree of resistance, have been established after repeated selfing. 



■ and Foster 1940 (88): Only moderate to slight resistance has been 



found — more than 1,000 collections tested; resistance was recessive and 

 conditioned bv multiple factors. 



Ferrari 1939 (62): Vars. Round Tip and the Turkish Xanthi ("Xanty 

 Yaka") were observed to be relatively resistant at Scafati (tested 1 vear). 

 Italy. 



Garner* Allard, and Clayton 1936 (76): All domestic varieties tried so 

 far are susceptible except a strain of Orinoco known as Faucette Special, 

 which shows moderate resistance; one foreign variety, "White Hon- 

 duras," also moderately resistant. 



Kincaid 1938 (125): Crosses have been made between a resistant variety 

 and commercial varieties. Florida. 



Ogloblin 1934 (184)' ^ a r- "Chileno Colorado" sometimes tolerates infesta- 

 tion much better than do other varieties, though young plants may' be 

 killed. Argentina (Miaiones). [Heavy infestations observed on this 

 variety by Kerzman 85 in Argentina.] 



Poole 1937: 86 "Blistering" of leaves is magnified by decay of the galls. 

 North Carolina. 



Shamel and Cobey 1907 (213): Promising selections made; development of 

 a resistant strain anticipated. [Nothing materialized from this project; 

 Bessey's (16) citation of the report is still quoted.] 



Tisdale 1923 (280): Selections made from a desirable strain, Ew-22-17, of 

 the Var. Big Cuban; some infestation on all plants. Florida. 



United States Bureau of Plant Industry 1938 (289): Seed collections 

 from Central America tested in Georgia, North Carolina, and South 

 Carolina; the better resistant strains suffered no damage; F 2 progenies 

 from selections crossed with Orinoco varieties show segregation for 

 resistance and susceptibility. [See report of Clayton, above.] 



Nicotiana tomentosa, giant tobacco. 



Kostoff and Kendall 1930 (129): No infestation obtainable; plants con- 

 tain a high percentage of alkaloids. Bulgaria. 



Nicotiana tomentosiformis [collected in 1921 from Ama on Basin; erroneously 

 identified as N. rusbyi: see Goodspeed (100)}. 



Kostoff and Kendall 1930 (129): No infestation obtainable on "N. 

 rusbyi"; plants contain a high percentage of alkaloids. Bulgaria. 



Nicotiana hybrid. 



Clayton and Foster 1940 (38): "Smiths allo-polyploid (N. tabacum X N. 

 glauca — n=36) shows resistance" (experimental). 



Nolana sp., nolana. (C) 



Neal 1889 (176): "Slightly affected." Florida. 



84 See report of Clayton on p. 140 of reference given in footnote 4, p. 6. 



S3 [Kerzman, I. X.] root knot del tabaco. Argentina Min. de Agr. Bol. Tabacalero 2 (4): 27-31. 

 1938. [Mimeographed.] 

 '6 See remark by Poole on p. 119 of reference given in footnote 3, p. 6. 



