36 MISC. PUBLICATION 40 6, U. S. DEPT. OF AGRICULTURE 



Sherbakoff 1939: M No galls found nor symptoms of injury on a number 

 of varieties and crosses in a plot where root knot had become severe on 

 tomatoes, grown continuously for 12 to 14 years; considerable root knot 

 injury on 12 varieties in a plot planted continuously to cotton for an 

 even longer time. Tennessee. 



Taubenhaus and Ezekiel 1933 {226): Losses rarely serious. Texas. 



United States Bureau of Plant Industry 1919: m Root knot was es- 

 pecially prevalent in 1918 on Var. Dixie. 



Var. Acala. 



California Nematode Committee 1925: 55 Infested but profitable. 

 King, C. J. (Division of Cotton and Other Fiber Crops and Diseases, Bureau 



of Plant Industry; in letter, 1939): Resistance medium; serious injury 



under certain conditions, e. g., sandy soils in the San Joaquin Valley, 



California. 

 and Hope 1934 {127) : Only 25 percent of the roots were galled and 



there was little decay in the tissues. Arizona. 

 Mackie, W. W. (California station; in letter, 1939): Shows much injury in 



California. 

 Scott, Lindsay, and Harrison 1939 {209): Infestation serious in the San 



Joaquin Valley, California. [Ms. data: Plants die in heavily infested 



spots; major damage to seedlings, complicated by other seedling diseases; 



roots of older plants sometimes heavily galled.] 



Gossypium hybrids. 



King 1937: 56 Hybrids between Acala and Sakellaridis (imported Egyptian 

 cotton, G. barbadense) proved resistant and vigorous in the Fi, but with 

 few exceptions F 2 plants revort to type. [Data in letter, 1939: All Fi 

 hybrids between upland {G. hirsutum) and American-Egyptian varieties 

 {G. barbadense) appear highly resistant, though some galls may be found. 

 "Interspecific hybridization was undertaken to determine if the factor 

 for relative resistance in the upland might be transmitted to some of the 

 Pimalike progenies that segregated in the F 2 . With such a wide cross 

 we had little hope of obtaining anything valuable." In the interspecific 

 hybrids Pima X Acala, F t plants may show as many galls as Acala, the 

 more resistant parent, but they grow and fruit vigorously in areas so 

 heavily infested that even Acala shows above-ground symptoms; in the 

 F 2 segregates, the Pimalike plants show most galls, Acalalike plants 

 fewest galls.] Arizona. 



Gram, see Cajanus and Phaseolus. 



Grape, see Vitis. 



Grass, see Agropyron, Agrostis, Andropogon, Arrhenatherum, Bromus, Chloris, 

 Cynodon, Dactylis, Digitaria, Echinochloa, Eleusine, Eragrostis, Euchlaena, 

 Eustachys, Festuca, Lolium, Panicum, Paspalum, Pennisetum, Phleum, Poa 

 Sorghum, Tricholaena, and Urochloa; see also millet and Gramineae. 



Guar, see Cyamopsis. 

 Guava, see Psidium. 



Guizotia abyssinica, nigerseed. (C) 



Krishna Ayyar 1933 {182): No infestation found in pot experiment. India 



(Madras). 



Hedysarum coronarium, sulla. (C) 



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



Helenium tenuifolium, bitterweed. 



Bessey 1911 {16): No infestation found. 



53 Sherrakoff, C. D. root-knot nematodes on cotton and tomatoes in Tennessee. Cotton Dis. 

 Council Proc. Ann. Mtg. 4: 15. 1939. [Mimeographed.] 



root-knot on tomatoes and cotton in Tennessee. Cotton Dis. Council Proc. Ann. Mtg. 



4: 15-17. 1939. [Mimeographed. J 



RECENT FIELD OBSERVATIONS ON TOMATO AND COTTON ROOT-KNOT NEMATODES. U. S. Bur. Plant 



Indus., Plant Dis. Rptr. Sup. 124: 146. 1940. [Mimeographed.] (Additional data, not cited above.) 

 M See p. 163 of reference given in footnote 17, p. 16. 

 ss See footnote 6, p. 8. 

 56 See report of King on p. 115 of reference given in footnote 3, p. 6. 



