

ROOT KNOT NEMATODE INFESTATION 73 



Var. Virginia Blackeye. 



Isbell 1934 (116): Infestation very light to medium; injury medium 

 (182 plants, 58 percent infested; 2 seasons). Alabama. 



Kendrick 1929 {121): "No evidence of disease" (wilt and root knot; 1 sea- 

 son). California. 



Mackie, W. W. (California station; in letter, 1938): Frequently killed by 

 root knot, though more resistant than the common Blackeye. 



Vigna sinensis crosses. 



Godfrey 1928 (93) : A Department of Agriculture "hybrid" (seed from 

 Federal Experiment Station, Honolulu) was comparatively free from 

 infestation during early growth; galls prominent after 3 months; plants 

 long outlived susceptible varieties; illustration. Hawaii. 



Mackie 1939 (152): A number of varieties of superior quality, resistance, and 

 yield created by crossing California Blackeye with Iron, followed by 

 repeated back-crossing to the Blackeye, and by plant selection. [Data 

 in letter: Placed with bean farmers; will soon be grown exclusively in 

 many areas.] California. 



Vinca spp., periwinkle. (S) 



Goff 1936 (96): Infestation to heavy on V. rosea (75 plants, 2 tests); 



average rating "very lightly infested." Florida. 

 Melchers 1915 (159): V. rosea infested in greenhouse. Kansas. 

 Watkins 1929 (248): Vinca rated as "resistant." Florida. [Possibly V. 



minor; the United States Bureau of Entomology and Plant Quarantine 



has a record of infestation on this species.] 



Vitis champinii, Champin grape. 



Var. Barnes. 



Nougaret 1923 (182): Medium-small galls on all plants; rating 53 15 (100 



cuttings, 1 year). 

 Snyder 1936 (216): Infestation very slight; rating 5 (58 vines, 4 years). 



Var. De Grasset. 



Snyder 1936 (216): Infestation very slight, rating 10 (14 vines, 1 year). 



Var. Dog Ridge. 



Nougaret 1923 (182) : Infestation found on only one-fourth of the plants — 



"trace"; rating 5 (50 cuttings, 1 year). 

 Snyder 1936 (216): Infestation very slight, rating 5 (45 vines, 4 years). 



Var. Ramsey. 



Snyder 1936 (216): Infestation slight, rating 25 (4 vines, 1 year). 



Var. Vermorel. 



Snyder 1936 (216): Infestation slight, rating 25 (20 vines, 1 year). 



Vitis cordifolia, frost grape. 



Neal 1889 (176): Certain races, for rootstocks, are free from the disease. 

 Florida. 



Vitis doaniana, Doan grape. 



Var. Salt Creek. 



Nougaret 1923 (182): No infestation found (50 cuttings, 1 year). 

 Snyder 1936 (216): Infestation very slight, rating 5 (55 vines, 4 years). 



Vitis labrusca, fox grape. 



Var. Isabella. 



Huergo 1903 (112): Var. "Isabel," cultivated in North America, has been 

 found more resistant than V. vinifera in Argentina at different times; on 

 roots more than 1 year old infestation is lighter and less frequent than on 

 V. vinifera, and decay of old galls is somewhat less severe. 

 Licopoli 1877 (140): Growth sufficiently vigorous in spite of infestation. 

 Italy. [The original publication cannot be found in this country; the 

 above citation is taken from Bellati and Saccardo (15).] 



« Grape roots tested in California by Nougaret {182) in Orange County and by Snyder (216) in Kern 

 County were given ratings from 0, no infestation found, to 100, infestation very heavy. 



