ROOT KNOT NEMATODE INFESTATION 29 



United States Bureau of Plant Industry (unpublished data in files of 

 Division of Nematology) : Infested specimen received from California 

 in 1937, collected by G. J. Harrison and C. E. Scott. 



Watson 1916 (249)' Bermuda grass listed among plants "immune or par- 

 tially immune." Florida. 



Whittle and Drain 1935 (263): Listed as seldom infested or highly 

 resistant. Tennessee (?) . 



Cynoglossum nervosum, great houndstongue. (C, S) 



Goff 1932 (95): Infestation very light. 

 ■ 1936 (96): Infestation very light to very heavy on "Cynoglossum 



sp., Chinese forget-me-not" (64 plants, 3 tests); average rating "heavily 



infested." Florida. 



Cyperus esculentus, chufa. (M) 



Bessey 1911 (16): Nematodes not abundant and no injury observed. 

 Gilbert 1914 (88): Listed as "largely or entirely immune." 



Dactylis glomerata, orchard grass. (C, N) 



Bessey 1911 (16): Nematodes not abundant and no injury observed. 

 Whittle and Drain 1935 (263): Listed as seldom infested or highly re- 

 sistant. Tennessee (?). 



Dahlia hybrids, dahlia. (N, S) 



Schmidt 1937: 38 Infestation severe in 13 of the varieties tested; moderate 

 in 9 varieties; light infestation, limited to small rootlets, in the following: 

 Vars. Alice Whittier, City of Trenton, Dancing Sultana, Fordhook 

 Marvel, Fort Monmouth, Ida Perkins, Jane Cowl, Jean Trimbee, 

 Lady Moyra Ponsonby, Long Hill, Monmouth Radiance, Mrs. Bruce 

 Collins, Robert Emmett, Satan, White Wonder, Yankee King, and the 

 Pompon Vars. Atom, Gertrude, and Little Edith. Observations during 

 4 years, "in most cases made on several plants of each variety." North 

 Carolina. 



Other authors report infestation severe on dahlia. 



Daisy, see Aster and Gerbera. 



Date palm, see Phoenix. 



Dayflower, see Commelina. 



Daylily, see Hemerocallis, 



Delphinium sp. (probably D. ajacis), larkspur. (N, S) 



Goff 1936 (96): Infestation very heavy (four plants, one winter test). 



Florida. 

 Watkins 1929 (248): Rated as "resistant." Florida. 



Derris elliptica. (C) 



Beeley 1939 (14): Infestation apparently not observed [Malaya?] nor 

 reported [in literature?]; experiments projected. 



Derris malaccensis. 



Beeley 1939 (14)'- Infestation apparently not observed [Malaya?] nor 

 reported [in literature?]; experiments projected. 



Desmodium molle (Meibomia mollis), beggarweed. (C) 



Beeley 1939 (14)'- Found attacked, but somewhat resistant. Malaya (?). 

 Bessey 1911 (16): No infestation found; appears to be free under most 



conditions. 

 Neal 1889 (176): A fine substitute for susceptible cowpeas. "Florida. 



Desmodium strictum (Meibomia stricta) . 



Bessey 1911 (16): Nematodes not abundant and no injury observed. 

 Desmodium tortuosum (Meibomia purpurea; M. tortuosa), Florida beggarweed. 



Georgia Coastal Plain Experiment Station 1935 (81): Beggarweed 

 more resistant than crabgrass. 



1936 (83): Can be used in a successful control rotation. 



Godfrey 1928 (93): "Appeared to be absolutely immune." Hawaii. 



3 8 Schmidt, Robert, relative susceptibility of certain varieties of dahlias to root-knot 

 nematode. U. S. Bur. Plant Indus., Plant Dis. Rptr. 21: 32-33. 1937. [Mimeographed.] 



