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



The Mississippi station has records of infestation on blackberry from Illinois 

 and Mississippi, and on raspberry from Illinois, Kentucky, Mississippi, and 

 Pennsylvania. No reports whatever have been found for loganberry. 

 Rudbeckia bicolor, rudbeckia. 



Goff 1936 (96): No infestation found (25 plants; 1 test). Florida. 

 Rumex acetosella, sheep sorrel. (N) 



Courtney, W. D. (Division of Neonatology, Bureau of Plant Industry. 



1937): Found infested in Oregon and Washington. 

 Muszynski and Strazewicz 1932 {174): No infestation found. Poland. 



Rutabaga, see Brassica. 



Rye, see Secale. 



Ryegrass, see Lolium. 



Saccharum officinarum, sugarcane. (N) 



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



Boyd 1925: 23 Var. Louisiana Purple ("Red" cane) showed marked stunting, 

 total loss in one field; galls minute on fine roots, but up to one-fourth 

 inch in diameter on the larger roots. Georgia. 



Cobb 1918: 24 Usually considered not serious; specimens from Florida 

 "extremely heavily affected"; some of the young stalks had died, mainly 

 or entirely because of root knot. 



Cook 1925 (46): Root knot is of little importance on sugarcane in Puerto 

 Rico. 



Fajardo and Palo 1933 (60): Rated as "resistant." [No data.] Philippine 

 Islands. 



Flor 1930 (65): Infestation found very sparingly in scattered regions in 

 Louisiana; inoculated plants (Var. Louisiana Purple) showed principal 

 injury to be the blinding of root tips; "results indicate that injury due to 

 root knot increases as the water content of the soil decreases." [This 

 conclusion is apparent in only one of the two tests; the averages tabulated 

 show no consistent moisture relations in the stunting of top growth, 

 whereas galls were more abundant at the intermediate moistures.] 



Kruger 1899 (133): Galls as large as hazel nuts; only one field heavily 

 infested; root knot does not, as formerly thought, cause the sereh 

 disease. Java. 



Martin 1938 (157): Normal growth not affected until root injury, which 

 may invite fungus invasion also, exceeds the "safety limit" of the ap- 

 parently superabundant root production. Hawaii. 



Matz 1925 (158): Infestations have undoubtedly caused the lack of growth 

 in older cane as well as the death of young cane in a number of fields; 

 root-tip decay is commonly associated with nematode infestation. 

 Puerto Rico. 



Mosseri 1904 (170): Complete destruction by root knot was recently re- 

 ported from Upper Egypt. 



Muir 1926 (172): Infestation may destroy a whole root when severe, but if 

 the root does not break down it appears to function fairly well. In Var. 

 Yellow Caledonia the galls are small and do not break down quickly, but 

 in Vars. Lahaina and H-109 the galls are much larger and break down 

 very quickly. Hawaii. 



Spencer 1919 (219): Infestations have caused serious loss; estimated injury 

 in one region this year will reduce the sirup output about one-third. 

 Florida. 



Taubenhaus and Ezekiel 1933 (226): Infested occasionally, little loss. 

 Texas. 



United States Bureau of Plant Industry 1920: 25 Crop injuries to sugar- 

 cane ranged from to 50 percent; estimated loss averaged about 1 per- 

 cent. Georgia. 



Van Zwaluwenburg 1931 (243) : In 1926 it appeared as if severe infestations, 

 which occurred on cane roots in certain fields, were responsible for the 

 growth failure in spots; it now seems probable that Heterodera was only 

 a contributing factor. Hawaii. 



23 Boyd, O. C. sugarcane diseases in Georgia. U. S. Bur. Plant Indus., Plant Dis. Rptr. 9: 122-123. 

 1925. [Mimeographed.] 



" Cobb, N. A. sugar cane: nematode injury caused by heterodera radicicola. U. S. Bur. Plant 

 Indus., Plant Dis. Bui. 2: 237-238. 1918. [Mimeographed.] 



35 Martin, G. Hamilton, Jr. diseases of cotton, sugar cane, forest trees, ornamentals, and 

 miscellaneous plants in the united states in 1919. U. S. Bur. Plant Indus., Plant Dis. Bui. Sup. 11, 

 pp. 274-306. 1920. [Mimeographed.] See p. 286. 



