12 



Aleurites fordii, tung-oil tree. (N) 



Dickey and Mowry 1939 (54)' Young seedlings in nursery stunted or killed, 

 as reported by Newell (178); galls almost never found on trees 1 to 18 

 years of age in heavily infested soil. Ten out of 19 "severely affected" 

 seedlings outgrew all root symptoms in 4 years (illustrations), but 

 remained stunted, 1 required longer, but 8 died. Seedlings from parent 

 tree No. 9 (single fruits) appear extremely vigorous, and more of them 

 have survived than from tree No. 2, Var. Florida (cluster type) . Florida. 



Ustinov 1936 (242) : Of no economic importance in the Soviet Union, although 

 root knot occurs wherever tung can be grown; found as one of the princi- 

 pal pests on tung saplings in Abkhazia. 

 Alfalfa, see Medicago. 

 Algaroba, see Prosopis. 

 Allium cepa, onion. (N) 



Barrons 1939 (13): Numerous larvae entered root tips of seedlings (Var. 

 Prizetaker) heavily inoculated in Alabama greenhouse. Onion "has 

 been said to be repellant." [No such statement can be found in literature 

 on the root knot nematode. Steiner (220), presumably the authority 

 for this remark on repellancy, and the authorities cited by Steiner all 

 referred to the sugar-beet nematode, Heterodera schachtii.] 



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



Byars 1919 (28): "Only occasionally reported on onions." [The following 

 paragraph calls onion a susceptible crop; illustration shows approximately 

 40 galls on 1 root.] 



California Nematode Committee 1925: ll Sometimes infested, but 

 profitable. 



Fajardo and Palo 1933 (60): Rated as "resistant"; five plants infested, 

 five plants free. Philippine Islands. 



Hume 1901 (113): Infestation does not interfere seriously with the crop. 

 Florida. 



King and Hope 1934 (127): Used with sesbania and vetch in a profitable 

 2-year rotation. Arizona. 



Linford 1939 (142) : Onion leaf tissue attracted larvae in vitro, though some- 

 what more slowly than did other highly attractive tissues. Hawaii. 



McClintock 1922 (145): The only vegetable tested that showed much 

 resistance. Georgia. 



Newhall 1934: 12 Infestation threatened to handicap onion production on 

 mucklands. New York. 



Pittman 1929 (192) : Not usually attacked to such an extent as other market- 

 garden plants. Western Australia. 



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



United States Bureau of Plant Industry 1919: 13 Infestation caused 

 great difficulty in growing onions on a farm near Laredo, Tex. 



Watson 1929 (255): Usually "immune" or only slightly infested. Florida. 



Wilson 1936 (265): Most seriously affected in the seedling stage, plants 

 seldom develop normally afterward. (Grown 40 years in some fields 

 with little rotation.) Ohio. 



Onion is infested also by the bulb-and-stem nematode, Ditylenchus dipsaci 

 (Kuhn) Filipjev, causing stunting, twisting and swelling of leaves, and bloatiness. 



Allium porrum, leek. 



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

 Bruel 1938 (26): Galls on young plants; infrequent. Belgium. 

 Sandground 1922 (207): Parasitized more or less severely in South Africa. 

 Whittle and Drain 1935 (263): Leek is listed as slightly infested. Ten- 

 nessee (?). 

 Allium sativum, garlic. 



Fajardo and Palo 1933 (60): Rated as "resistant" (judged by growth); 

 15 plants, all infested. Philippine Islands. 



Allium schoenoprasum, chive. 



No reports whatever have been found for this plant. 



» See footnote 6, p. 8. 



12 Newhall, A. G. root knot nematode population in new york reduced by cold winter. U. S. 

 Bur. Plant Indus., Plant Dis. Rptr. 18: 111. 1934. [Mimeographed.] 



13 Haskell, R. J., and Martin, G. H., Jr. summary of plant diseases in the united states in 1918. 

 n. diseases of field and vegetable crops. U. S. Bur. Plant Indus,, Plant Pis, Bui. Sup. 2, pp. 42-83, 

 lllus. 1939. [Mimeographed.] See p. 83. 



