ROOT KNOT NEMATODE INFESTATION 35 



Gnaphalium luteo-album. 



Godfrey 1935: 52 Infestation commonly observed to be light. Hawaii. 

 Gnaphalium purpureum. 



Bessey 1911 (16): No infestation found. 

 Goldenrod, see Solidago. 

 Gomphrena globosa, globe-amaranth. (C) 



Ceylon Department of Agriculture 1936 (33): Infestation recorded in 



Ceylon. 

 Goff 1936 (96): Infestation to heavy (25 plants, 1 test); average rating 



"very lightly infested." Florida. 



An unidentified species of Gomphrena has been found infested in Palestine 

 (unpublished data of G. Minz, research station, Rehovot, Palestine; in letter, 

 1940). 



Gonya grass, see Urochloa. 



Gooseberry, see Ribes. 



Goosegrass, see Eleusine. 



Gossypium barbadense, Egyptian cotton and sea-island cotton. (N, S) 



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

 of Plant Industry; in letter, 1939): Var. Sakellaridis (Sakel) slightly 

 "resistant" as compared with Var. Pima, but often seriously injured. 

 Arizona. 



Miles 1939 (165): Sea Island 13B3 (Seabrook strain) averaged slightly 

 fewer infested plants (44.5 percent) than any of the 17 upland varieties 

 tested [see G. hirsutum]. Mississippi. 



There are many reports of injury to this species of cotton. 

 Gossypium hirsutum, upland cotton [called also American upland]. (N) 



Barker 1938 (10): Upland cottons in general are tolerant of nematodes under 

 average field conditions. 



Bessey 1911 (16): Nematodes abundant, injury apparently not great. 



Georgia Coastal Plain Experiment Station 1928 (78): Infestation 

 increased after two crops of Var. Petty-Toole. 



1938 (85): Cotton has only slight value in control rotations with 



tobacco. 



King 1938 (126): Little injury in soils having a moisture equivalent above 

 18; at 16 or less the stands are often reduced; yields 3.25 to 1 compared 

 with Var. Pima (G. barbadense) on infested soil, 1.8 to 1 on noninfested 

 soil. [Data in letter, 1939: Var. Miller is unusually susceptible as com- 

 pared to such upland varieties as Acala, Coker Clevewilt, and Missdel; 

 other upland varieties show slight differences in resistance, e. g. Vars. 

 Delfos, Durango, Hartsville, King, Lone Star, and Mebane Triumph.] 

 Arizona. [Cf. report of Miles, below.] 



and Hope 1934 (127): Readily attacked, but yields are much higher 



than from Var. Pima (G. barbadense) in infested areas continuously 

 cropped to cotton; infestations remain active. Upland plants seldom 

 die from root knot under Arizona conditions. 



Krishna Ayyar 1933 (132): No infestation found in pot experiment, Var. 

 Cambodia. India (Madras). 



Miles 1939 (165): Average 59.5 percent of plants infested in Var. Dixie 14-5, 

 64.72 percent in Missdel Wilt Resistant, 74.76 percent in Miller 610, 

 and 100 percent in a selfed line of Missdel No. 4; averages from 45.63 

 percent to 75.25 percent in Vars. Carolina-del No. 2, Clevewilt 6, Coker 

 100, Cook 144-68 and 307, Delta & Pine Lands 11 A, Dixie-Triumph 

 12 and 55-85, Half and Half, Perry-Toole, Rowden 2088, Sikes Wilt Re- 

 sistant, and Washington; in all but three varieties there was less wilt 

 than root knot (1 season). Mississippi. 



« See footnote 10, p. 11. 



