

ROOT KNOT NEMATODE INFESTATION 13 



Allium vineale, wild garlic ("wild onion"). 



Barrons 1939 (IS): Appreciable signs of resistance have been observed; 

 when heavily inoculated in greenhouse, numerous larvae entered root tips 

 of seedlings. Alabama. 



There are no other host records for this weed. 



Almond, see Amygdalus. 



Aloe spp. (N) 



Grower: Vigorous; not injured by infestation. California. 



Alyssum, see Lobularia. 



Amaranth, globe-, see Gomphrena. 



Amaranthus caudatus, love-lies-bleeding. (M) 



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



Krishna Ayyar 1933 (131): Host in south India. [Specific and common 

 names given as above, then "(crimson)".] 



Amaranthus caudatus atropurpureus (A. atropurpureus) , redleaf love-lies-bleeding. 



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

 Amaranthus spinosus, carelessweed, pigweed, spiny amaranth. (N) 



Atkinson 1889 (4): Found free at Auburn, growing beside an infested 



species. Alabama. 

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

 Neal 1889 (176): "Badly affected"; favorite host, most dreaded in the 



spread of root knot. Florida. 

 Steiner 1934 (222): Not attacked, among infested rice plants, though 



known to be a host. Arkansas. 

 Watson and Goff 1937 (258): Infestation comparatively heavy. Florida. 



Carelessweed has been called irregularly infested (i. e., not a certain indicator") 

 by an observant pathologist. California. 



Amaranthus spp. (N) 



Goff 1936 (96): Infestation very heavy on "molten fire," most of the plants 



greatly stunted. Florida. 

 Watkins 1929 (248): Annual Amaranthus rated as "resistant." Florida. 



Amaryllis hybrids. (C) 



Grower: Not attacked. Florida. 

 Ammi, see Trachyspermum. 



Amygdalus communis (Prunus amygdalus), almond. (N, S) 



California Agricultural Experiment Station 1936 (SO): Of more than 

 200 seedlings from a selection by Tufts and Day, only 8 percent "became 

 affected." [According to L. H. Day (in letter, 1939) nearly all developed 

 knots in 1938. See recent publication by Day and Tufts (53a).] 

 Hutchins 1937 (114)' Seedling rootstocks of Var. Nonpareil have been vari- 

 able in resistance. Georgia. 

 Tufts and Day 1934 (234) '• Seedlings of 15 common commercial varieties 

 and of several crosses were tested 1 to 3 seasons in California; every lot 

 had some severely infested trees. A few vigorous seedlings free from 

 knots were found in Vars. Languedoc, Lewelling, Peerless, Almond 1-11, 

 Seedling 8-23 (Nonpareil X Harriott), crosses Nonpareil X Eureka, 

 Nonpareil X Jordan, and Texas X Eureka. Some seedlings of Bitter 

 No. 23-20 (var. amara) were free from knots (1 season, 1934). 



Amygdalus davidiana (Prunus davidiana) , Chinese wild peach. 



Fikry 1939 (64) : Infestation (verified by Dr. Goodey) very slight and limited 

 to collar region, found on 20 trees; percentage of infestation increased 

 with the growth period (64 trees tested 2 to 5 years) . About 5 percent 

 of seedlings are attacked, very slightly, in nursery. Egypt. 



Hutchins 1937 (114) : Seedlings vigorous but susceptible. Georgia. 



Tufts and Day 1934 (234): "Has been variously reported as resistant and as 

 susceptible"; according to other records, "has often failed to grow well 

 because of nematodes"; in California tests, 4 trees lightly infested, 

 1 moderately, all vigorous (1 season). [Data in letter, 1939: More 

 than 100 seedlings planted in 1 orchard, all "affected."] l 



