56 MISC PUBLICATION 40 G, U. S. DEPT. OF AGRICULTURE 



Primus avium, mazzard, sweet cherry. 



Minz 1936 (166): Reported infested in Palestine. 



Tufts and Day 1934 (284): Seedlings not infested (2-year test). California. 



Prunus bokhariensis, plum. 



Tufts and Day 1934 (234): Infestation moderate to heavy; some seedlings 

 of P. I. No. 40224 were free from knots (Delhi nursery 1 season, 1934). 

 California. 



Prunus cerasifera (P. myrobalana) , myrobalan plum. (S) 



Fikry 1939 (64): No infestation found (71 roots, grown 4 years). Egypt. 



Milbrath 1923 (162): Roots destroyed by nematodes; illustration. Cali- 

 fornia. 



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



Tufts and Day 1934 (284): Infestation to heavy on 11 strains tested 1 to 3 

 seasons in Delhi nursery: No infestation found on rooted cuttings of 

 Myrobalan 2-7 (2 seasons), Myrobalan 8-10, a vigorous grower (3 

 seasons), or Myrobalan B, "perhaps a type of Marianna" (3 seasons), 

 nor on 3 vigorous trees of Myrobalan B in heavily infested orchard 

 (2 years). Infestation light on Myrobalan 2500, some individuals free 

 from knots (1 season, 1934). Some cuttings or seedlings of 4 sus- 

 ceptible selections remained free from knots 1 season (1934), whereas 

 3 other selections showed no sign of resistance. California. 



Whittle and Drain 1935 (268): Susceptible stock. Tennessee. 



Var. Marianna. 11 



Fikry 1939 (64): No infestation found (110 roots, grown 4 years). Egypt. 



Hume 1937: 12 Never found infested. Florida. 



McClintock 1922 (145): No knots found (1 season). Georgia. 



Neal 1889 (176): Free from knots 3 years. Florida. 



Tufts and Day 1934 (234): "Rooted cuttings of 25 seedlings, selected for 

 their vigor, were free from infestation during the 2 years they were 

 under test"; neither was there visible infestation on "(English?)' 1 

 Marianna (1 season in Delhi nursery). California. 



Whittle and Drain 1935 (263): Marianna stock is seldom attacked. Ten- 



Prunus cerasus (P. vulgaris), sour cherry. 



Neal 1889 (176): Roots of P. vulgaris are "badly affected," whereas those of 

 P. cerasus are unhurt. Florida. [This statement is not a contradiction, 

 because Neal listed P. vulgaris as peach.] 



Tufts and Day 1934 (284): Seedlings of Vars. English Morello and Mont- 

 morency Monarch free from attack (1 season, 1934); Var. Stockton 

 Morello [vegetatively produced by suckers] not infested in 2-year test. 

 California. 



No host report has been found for this species. 

 Prunus dasycarpa, purple apricot. 



Tufts and Day 1934 (234)'- No infestation found on seedlings in nursery. 

 California. 



Prunus demissa, western chokecherry. 



Tufts and Day 1934 (234)'- Free from infestation (1 season, 1934, in nur- 

 sery) . California. 



Prunus domestica, common plum. 



Var. Grand Duke. 



Tufts and Day 1934 (284): Infestation moderate; some seedlings free from 

 knots (1 season, 1934). California (Delhi). 



Prunus hortulana, hortulan plum. 



Hutchins 1937 (114)'- Highly resistant in tests. Georgia. 

 Tufts and Day 1934 (£34): No visible infestation (seedlings 1 season, 1934, 

 in Delhi nursery). California. 



11 Possibly a hybrid; ancestry uncertain. 



12 See footnote 5, p. 8. 



