. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. BULLETIN No. 957 Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Chief. <J^M?Lr&. Washington, D. C. PROFESSIONAL PAPER February 6, 1922 INVESTIGATIONS OF THE WHITE-PINE BLISTER RUST. By Perley Spaulding, Pathologist, Investigations in Forest Pathology. CONTENTS. Page. Scope of the investigations 1 Origin and distribution of Cronartium ribi- cola 3 Hosts of Cronartium ribicola 11 Pines infected and likely to becom e infected 11 Inoculations of Cronartium ribicola
. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. BULLETIN No. 957 Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Chief. <J^M?Lr&. Washington, D. C. PROFESSIONAL PAPER February 6, 1922 INVESTIGATIONS OF THE WHITE-PINE BLISTER RUST. By Perley Spaulding, Pathologist, Investigations in Forest Pathology. CONTENTS. Page. Scope of the investigations 1 Origin and distribution of Cronartium ribi- cola 3 Hosts of Cronartium ribicola 11 Pines infected and likely to becom e infected 11 Inoculations of Cronartium ribicola on pines 12 Species of Ribes that have been infected naturally 14 Inoculations of Cronartium ribicola on Ribes 16 Susceptibility of Ribes species and varie- ties to Cronartium ribicola 23 Life history of Cronartium ribicola The Peridermium stage on pines The Cronartium stage on Ribes Overwintering of Cronartium ribicola Important dates in the life history of Cronar- tium ribicola Control of the white-pine blister rust Significant factors which determine con- trol Experiments in control in Europe Experiments in control in North America Status of the control of white-pine blister rust Literature cited Page 24 24 90 SCOPE OF THE INVESTIGATIONS. In a previous publication (131)x the writer collected data on the more practical aspects of the white-pine blister rust, as presented in European literature. Experience has shown that the white-pine blister rust has come to North America to stay and that most careful and searching investi- gations must be maintained to enable us to cope with it at all success- fully. Investigations in Europe have been carried on -in a desultory way for 35 years. In North America they were begun less than 15 years ago. Really intensive work has been in progress for only about 5 years. Considerable new experimental work has been done in Europe since the appearance of this earlier publication. At various times since 1911 some of the more salient results of the
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