254 B. K. BAKSHI 



inoculation experiments to determine the susceptibility of the various 

 white pines and Ribes species appears necessary. 



The aecial stage of C. vibicola on P. walliohiana was named 

 Pevidevmium indicum Colley and Taylor (1927) , because it was considered 

 distinct from Pevidevmium stvobi Klebahn, the aecial stage of C. vibicola 

 on P. stvobus. Bagchee (1950) found two distinct Peridermiums on P. 

 walliohiana in India. One resembled P. indicum of Colley and Taylor with 

 the alternate host being R. vubvum s occurring in Kulu and Chakrata. The 

 other was similar to P. stvobi with alternate host being R. ovientale 

 Poir. occurring further to the west in Kashmir. However, he considered 

 this morphological difference inadequate for considering them distinct. 

 Peterson (1967) maintains the separate identity of the two aecial stages 

 occurring on P. walliohiana and P. stvobus based on differences in aecio- 

 spore and peridial wall characters. In view of this, the occurrence of 

 more than one strain in C. vibicola may have to be reexamined. Until 

 now C. vibicola has been regarded as a homogenous species (Boyce, 1961) 

 and is not known to occur in more than one strain on Ribes (Hahn, 1949) . 

 A critical morphological study of C. vibicola based on material collected 

 from all over the world and cross inoculation experiments are necessary, 

 as this may have a bearing on the relative blister rust resistance of 

 5-needle pines. 



LITERATURE CITED 



Bagchee, K. 1950. Contributions to our knowledge of the morphology, 

 cytology and biology of Indian coniferous rusts. Part II. Observa- 

 tions on the occurrence of Cvonavtium vibicola Fischer and Pevidevmium 

 indicum Colley and Taylor on Pinus excelsa Wall, in India with refer- 

 ence to their distribution, pathology, inoculation experiments and 

 comparative morphology. Indian Forest Rec. 4: 1-41. 



Bingham, R. T. 1967. International aspects of blister rust resistance 

 in white pines, p. 832-841. In Proc. 14th IUFRO Cong., Vienna, 

 Vol. III. 926 p. 



Boyce, J. S. 1961. Forest pathology. McGraw Hill Book Co., New York. 

 572 p. 



Boyer, M. G. 1961. Studies on white pine blister rust. Can. Dept . 

 Forest., Lab. Forest Pathol. (Maple, Ont.) Interim Rept . 39 p. 



Buchanan, T. S. 1964. Diseases of white (5-needle) pines, p. 100-120. 

 In Diseases of widely planted forest trees. FAO/FORPEST Rept. 64. 

 237 p. 



Colley, R. H. and M. W. Taylor. 1927. Pevidevmium kuvilense Diet, on 

 Pinus pumila Pall, and Pevidevmium indicum n. sp. on Pinus excelsa 

 Wall. J. Agric. Res. 34: 327-330. 



Hahn, G. G. 1949. Further evidence that immune ribes do not indicate 

 physiologic races of Cvonavtium vibicola in North America. Plant 

 Dis. Rep. 33: 291-292. 



Heimburger, C. 1962. Breeding for disease resistance in forest trees. 

 Forest. Chron. 38: 356-362. 



Peterson, R. W. 1967. The Pevidevmium species on pine stems. Bull. 

 Torrey Bot . Club 94: 511-542. 



Scholz, E. 1960. Befall unterschiede und Resistenze bei Pinus stvobus 

 gegen Cvonavtium vibicola Dietr. = Pevidevmium stvobi. Kleb . Zuchter 

 30: 61-72 (cited from Boyer, 1961). 



Spaulding, P. 1922. Investigations of the white pine blister rust. U.S. 

 Dep. Agr. Bull. 957. 100 p. 



Spaulding, P. 1929. White pine blister rust: a comparison of European 

 with North American conditions. U.S. Dep. Agr. Tech. Bull. 87. 58 p. 



