ROOT KNOT NEMATODE INFESTATION 51 



Infestations have been reported on P. zonale, on Hort. Var. Roseum, and on 

 unspecified geranium in a few other instances. Members of the Division of 

 Neonatology (Buhrer, Steiner, Tyler) have found resistance the usual situation, 

 however, in the common hybrid bedding geraniums. 



Pennisetum cenchroides (name supplied), buff el. (C) 



Collins 1938 {41): Buffel not attacked (1 season). Rhodesia. [See also 

 Panicum hirsutissimum.] 



Pennisetum glaucum (P. typhoideum) , pearl millet. 

 Bessey 1911 (16): No infestation found. 



Godfrey 1928 (92): No infestation found (one test). Hawaii. 

 Krishna Ayyar 1933 (132): No infestation found in pot experiment. India 

 (Madras). 



Pennisetum purpureum, elephant grass, Napier grass. 



Godfrey 1935: 93 Infestation commonly observed to be light. Hawaii. 

 Peony, see Paeonia. 

 Pepper, see Piper. 

 Periwinkle, see Vinca. 



Persea americana (P. gratissima) , avocado. (C, N) 



Bessey 1911 (16): No infestation found. 



California Nematode Committee 1925: 94 Avocado resistant. [In Cali- 

 fornia both P. americana and P. americana dry mi folia are used as 

 rootstocks.] 

 Ghesquiere 1921 (86): Infestation found. Belgian Congo. 

 Lavergne 1901 (186): Trees died. Chile. [Roots apparently not ex- 

 amined. See Citrus for a partial explanation of this confused study.] 



Persimmon, see Diospyros. 



Peruvian-bark, see Cinchona. 



Petunia, common petunia. (N, S) 



Bessey 1911 (16): Injury severe. 



Godfrey 1935: 95 Infestation heavy. California and Hawaii. 



Goff 1936 (96): Infestation very light to very heavy (80 plants, 3 tests); 

 average rating "lightly infested." Florida. 



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



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



Watkins 1929 (248): Both common and giant-flowered petunias rated as 

 "resistant." Florida. 



Phaseolus aureus (P. max), green gram, mung bean. (S) 



Collins 1938 (41): "Munga" was not attacked in test (1 season) but was 

 attacked and dwarfed on one farm. Rhodesia. 



Very susceptible according to other reports. 

 Phaseolus lunatus, lima bean. (N, S) 



Beeley 1939 (14)' Found attacked, but somewhat "resistant." Malaya (?). 



California Agricultural Experiment Station 1936 (29): A large lima 

 obtained from Peru; highly resistant but poor quality, no commercial 

 value except for breeding. 



Mackie, W. W. (California station; in letter, 1939): A small lima, "black- 

 seeded hybrid," secured through United States Department of Agricul- 

 ture explorers, was almost immune (only 3 small galls found on more than 

 100 plants) in 2 heavily infested areas in California where other resistant 

 beans entirely died out; by crossing and back-crossing with his best 

 resistant Hopis and with large limas, Mackie hopes to produce large 

 and small limas of superior resistance. 



Townsend 1934 (231): "A collection of Fordhook lima beans probably 

 resistant to nematodes has been made." Florida. 





« See footnote 10, p. 11. 

 m See footnote 6, p. 8 . 

 »* See footnote 15, p. 16. 



