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



Georgia Coastal Plain Experiment Station 1938 (85): Successful control 

 for one tobacco crop by two or more successive crops of oats followed 

 by weeds. 



Godfrey 1928 (92): Infestation abundant (one test). Hawaii. 



Goffart 1934 (97): Not infested in greenhouse experiment (8-week tests). 

 Germany (Berlin-Dahlem). [See also Gramineae.] 



Halsted 1891 (108): "Nematodes" found "in the roots of sickly oats." 

 New Jersey. [This has been cited as the original report of root knot on 

 oats. However, there are reasons for doubt: There is no mention of galls 

 on the roots; the general term "nematodes" is used in the same publica- 

 tion for several very different species; and the disease had already been 

 diagnosed as caused by bacteria.] 



Le Roux and Stofberg 1935 (137): Resistant in rotation experiment. 

 Transvaal. 



Orton 1903 (187): Oats ("immune") recommended for a starvation rotation. 



Reh 1906 (198): Injuries up to 75 percent in Sweden. [The paragraph 

 describing these injuries is taken directly from an abstract of papers by 

 Nilsson-Ehle (179) on the sugar-beet nematode, Heterodera schachtii.] 



Shaw 1940 (213a) : Tobacco in enclosure units showed less than 10 percent 

 severe infestation following oats and bare fallow, 77.5 percent following 

 oats and weeds, and 100 percent following tobacco or other susceptible 

 crops. In field plots, tobacco showed 11 percent severe infestation fol- 

 lowing peanuts, 43.5 percent following oats and weeds, and 93.3 percent 

 following tobacco (2-year averages) ; in 3-year rotations, tobacco showed 

 less than 10 percent severe infestation following oats [and weeds after pea- 

 nuts], less than 25 percent following oats and weeds after corn, and 93 

 percent following continuous tobacco (1 year's results). [North Carolina.] 



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

 materially interfere with growth. Florida. 



Oats and other cereals are attacked by the bulb-and-stem nematode, Ditylen- 

 chus dipsaci, with swelling of stems ("tulip root"), stunting, and twisting or thick- 

 ening of leaves, which may stand rigidly upright ("segging") ; by the sugar-beet 

 nematode, Heterodera schachtii, which causes severe stunting and yellowing, and 

 even "nodular thickenings on the roots, from which numerous lateral roots are 

 given off" (53); and by the meadow nematode, Pratylenchus pratensis (deMan) 

 Filipjev. 



Avocado, see Persea. 



Azalea, see Rhododendron. 



Banana, see Musa. 



Barley, see Hordeum. 



Barnyard grass, see Echinochloa. 



Bean, see Phaseolus; see also blackeye, guar, hyacinth-bean, jackbean, kudzu- 

 bean, lablab, paternoster-bean, soybean, velvetbean, yam-bean. 



Beggarweed, see Desmodium. 



Berkheya gracilis. (C) 



Collins 1937 (41): No signs of nematode attack. Rhodesia. 

 Bermuda grass, see Cynodon. 

 Berseem, see Trifolium. 

 Bidens bipinnata, Spanish needles. (C) 



Bessey 1911 (16): Always found free. 

 Bidens insecta (Coreopsis insecta). 



Collins 1937 (41)'- No signs of nematode attack. Rhodesia. 

 Bidens leucantha. 



Bessey 1911 (16): Always found free. 

 Bidens pilosa, blackjack, Spanish-needles, stick-tight. 



Collins 1937 (4-1)'- No signs of nematode attack. Rhodesia. 



Godfrey 1935: 22 Infestation rare. Hawaii. 



« See footnote 10, p. 11. 



