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



Kerzman 1938: 57 Some varieties appear susceptible to attack. Argentina. 

 King and Hope 1934 (127): Corn in rotation increases cotton yield 



Arizona. 

 Krishna Ayyar 1933 (131, 132): Xo infestation found in pot experiment 



nor in infested plot, and soil population reduced. India (Madras). 

 Lunn and Mattison 1937 (143): Infestation on tobacco following corn is 



moderate to severe, showing no better control than following cotton. 



South Carolina. 

 Melchers 1915 (159): Galls found on Var. Biirbank Rainbow in green- 

 house. Kansas. 

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

 Oregon Agricultural Experiment Station 1938 (185): Corn as an 



alternate cultivated crop greatlv reduced the nematode population in 



the field. 

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

 Poole 1933: 58 Infestation prominent in North Carolina in 1932. [Poole 



also reported a case of stunting in 1930.] 59 

 Rolfs 1907 (201): "Almost quite immune." 

 Sandground 1922 (207) : Found susceptible to some degree, in a heavily 



infested orchard, but can often be grown profitably. South Africa. 

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



severe infestation following bare fallow or certain highly resistant crops 



and 100 percent following corn, cotton, sweetpotatoes, or tobacco. 



In field plots, tobacco showed 11 percent severe infestation following 



peanuts, 67.3 percent following corn, 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 peanuts, 



less than 25 percent following oats and weeds after corn, 28 percent 



following corn-cotton, and 93 percent following continuous tobacco 



(1 year's results). [North Carolina.] 

 Smee 1928 (214) '■ Maize for rotation has given good results in Xyasaland. 

 Steiner, G. (Division of Nematology, Bureau of Plant Industry. 1939) : 



Very heavy infestations have been submitted from Georgia, South 



Carolina, and North Carolina. 

 Taylor, A. L. (Division of Nematology, Bureau of Plant Industry. 1939): 



Two or three instances of severe damage in Georgia, showing as isolated 



stunted patches. 

 Townsend 1935 (232): Beans following corn were not severely injured, but 



were an almost complete loss following two bean crops. Florida. 

 Watson and Goff 1937 (258) : Usually highly resistant on well drained 



land; often rather heavily infested on poorly drained land. Florida. 

 Whittle and Drain 1935 (263): Field corn and sweet corn listed as seldom 



infested or highly resistant. Tennessee (?). 

 Wilson 1936 (265): Grown for rotation where a root knot population had 



been built up on onions. Ohio. 



The differences in susceptibility of corn may be due to differences in host strains 

 of the nematode or to external conditions, but careful records of the behavior of 

 corn varieties might prove of value. 



Zinnia elegans, common zinnia. (C, N, S) 



Buhrer, Cooper, and Steiner 1933: 60 Infestation found. [District of 



Columbia.] 

 Goff 1936 (96) i: Infestation to light (0 or very light on most: 144 plants, 



small and giant: 4 tests). Florida. 

 Krishna Ayyar 1933 (131): Host in south India. 

 Tyler 1938: 61 Infestation very heavy on 33 horticultural varieties under 



greenhouse conditions; tolerance not determined. District of Columbia. 



Zinnia spp., zinnia. 



Bessey 1911 (16): No infestation found. 



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

 Cevlon. 



« See footnote 85, p. 48. 

 56 See footnote 58, p. 38. 



5 9 See report of Poole on p. 64 of reference given in tootnote 16, p. 16. 

 so See footnote 20, p. 17. 

 6i See report of Tyler on p. 140 of reference given in footnote 4, p. 6. 



