ROOT KNOT NEMATODE INFESTATION 53 



Isbell and Barrons 1938 (117): No. 1 is highly resistant but not immune; 

 outstanding for home gardens. On a few occasions in badly infested 

 soil galls have been found, never large nor numerous, on old plants 

 only. Reselected strains introduced in 1938 (tested 8 years); continued 

 breeding with hybridization and selection promises further improvement. 

 Alabama. 



Mackie, W. W. (California station; in letter, 1939): Only slightly resistant 

 where tested in California; dies under severe attack, and succumbs also 

 to scab and dry rot. Mackie has recently selected more resistant types 

 from heterozygous lots of Alabama material. 



Taylor, A. L. (Division of Nematology, Bureau of Plant Industry. 1937): 

 Little or no early infestation was found in the field, but a large proportion 

 of the smaller roots were infested by the end of the season (No. 1 and 

 No. 2, at least 50 plants each). Georgia. 



Tennessee Agricultural Experiment Station 1936 (227): "Resistant to 

 nematode injury," but lacked commercial quality. 



Phleum pratense, timothy. (C) 



Besset 1911 (16): No infestation found. 



Whittle and Drain 1935 (263): Listed as seldom infested or highly resistant. 

 Tennessee (?). 



Phlox drummondi, Drummond phlox. (N) 



Goff 1936 (96): Infestation to very heavy; majority of plants only lightly 

 infested (Var. Big Drummond. 133 plants, 4 tests); infestation to 

 heavy (P. drummondi var. stellaris. 25 plants, 1 test); average rating 

 "very lightly infested." Florida. 

 Steiner and Buhrer 1933: " First host record. District of Columbia. 

 Watkins 1929 (248) : Rated as "resistant." Florida. 



Phlox nana compacta. 



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

 "very lightly infested." Florida. 



Phoenix dactylifera, date palm. (N) 



California Nematode Committee 1925: 1 Resistant. 



Heald 1933 (109) : Listed as "especially subject." [Date palm is Heald's 

 only addition to the list of hosts from U. S. Farmers' Bulletin 1345.] 



Thorne, G. (Division of Nematology, Bureau of Plant Industry. 1938) : 

 Many young palms appeared to be retarded in growth by heavy in- 

 festation when visited in 1925; by 1938 these plantings had apparently 

 largely recovered and were growing normally. California. 



Pigeonpea, see Cajanus. 



Pigweed, see Amaranthus. 



Pilea serpyllifolia, artilleryplant. (C) 



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

 Watson and Goff 1937 (258) : Wild host. Florida. 



Pimpernel, see Anagallis. 



Pineapple, see Ananas. 



Pink, see Dianthus. • 



Pinus spp., pine. (C, N) 



Buhrer 1938: 2 P. caribaea, slash pine, and P. palustris, longleaf pine, are 

 listed as hosts. [Infestation of seedlings was recorded once, from 

 Florida.] 

 Hume 1937: 3 No harmful infestation ever seen; heavily infested nursery land 

 may be freed of nematodes in 6 or 7 years, possibly less, by setting pine 

 trees near enough together to keep out green weeds. Florida. 

 Linford 1939 (142): Small pieces from fresh boards of commercial sugar- 

 pine lumber showed distinct but mild attractiveness to larvae in vitro 

 in repeated tests. Hawaii. 



99 See footnote 66, p. 41. 



1 See footnote 6, p. 8. 



2 See footnote 87, p. 49. 

 8 See footnote 5, p. 8. 





