ULLETIN OF CHE 



\ 



No. 116 



Contribution from the Bureau of Plant Industry, Wm. A. Taylor, Chief. © 

 June 24, 1914. 



(PROFESSIONAL PAPER.) 



NEW FACTS CONCERNING THE WHITE-PINE BLISTER RUST. 1 



By Perley Spaulding, 



Pathological Inspector, Federal Horticultural Board (formerly Pathologist, Office of 

 Investigations in Forest Pathology) . 



INTRODUCTION. 



In a recent publication 2 the writer gave the latest information 

 regarding the white-pine blister rust up to the spring of 1913. The 

 past season has brought forth several additional developments, 

 which are of great importance. 



THE SITUATION AT GENEVA. 



Since 1906, when Stewart first discovered the presence of Cronar- 

 tium ribicola upon Eibes at Geneva, N. Y., the disease has been 

 found there in several different years. 3 This occurred in spite of the 

 total destruction of the Ribes found affected in 1906 and the apparent 

 absence of the secial stage of the fungus on the neighboring white 

 pines. 3 In the spring of 1913 the New York State department of 

 agriculture took up the matter, and a special effort was made to 

 locate and examine every white-pine tree within the diseased area, 

 with the result that two trees about 15 years old were found by 

 Inspector Maney bearing the fruiting bodies of the fungus. They 

 were promptly destroyed. These evidently had been diseased for 

 a long time, probably since they were 3 or 4 years old. No definite 



1 This paper is intended to supplement the previous publication, Bureau of Plant Industry Bulletin 

 206, entitled " The Blister Rust of White Pine." It is, therefore, as brief as possible, and care has been 

 taken not to duplicate statements made in that publication. These two bulletins are necessary in order 

 to secure complete information regarding this disease. 



2 Spaulding, Perley. The present status of the white-pine blister rust. In U. S. Dept. Agr., Bur. Plant 

 Indus. Cire. 129, p. 9-20, 6 fig. 1913. 



3 Stewart, F. C. Pine blister rust and currant felt rust. In West. N. Y. Hort. Soc. Proc. 58th Ann. 

 Meeting, p. 122-124. 1912. 



Stewart, P. C, and Rankin, W. H. Can Cronartium ribicola overwinter on the currant? In Phyto- 

 pathology, v. 4, no. 1, p. 43. 1914. 



Jordan, W. H. Director's report for 1906. N. Y. State Agr. Exp. Sta. Bui. 284, p. 341-342. 1906. 

 Director's report for 1912. N. Y. State Agr. Exp. Sta. Bui. 356, p. 559. 1912. 



Note. — This paper contains additional information concerning the white-pine blister rust that was 

 collected during the season of 1913. It is ot interest to foresters, tree experts, nurserymen, and owners of 

 ornamental and forest plantations of 5-leaved pines. 

 45612°— Bull. 116—14 



