File:The publications of the Pennsylvania chestnut tree blight commission, 1911-1913 (1915) (14579523847).jpg

Identifier: publicationsofpe00penn (find matches)
Title: The publications of the Pennsylvania chestnut tree blight commission, 1911-1913
Year: 1915 (1910s)
Authors: Pennsylvania. Chestnut tree blight commission
Subjects: Chestnut blight Chestnut blight
Publisher: Harrisburg : W. S. Ray, state printer
Contributing Library: Penn State University
Digitizing Sponsor: LYRASIS Members and Sloan Foundation

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
eastern district,since what is desired is to get cutting started on a sane and profit-able basis, and this a mere general method of work usually fails toaccomplish. Success or failure depends on whether or not buyerand seller can be brought together on a satisfactory basis. Thework must be profitable to both owner and dealer. A competentand well-informed field agent can work out a comprehensive planfor disposing of all the merchantable chestnut in a commmunity.Through his knowledge of prices, rates, specifications, sanitationmeasures, etc., he is the means of saving timber owners from muchof the loss occasioned by the blight. DISEASE INVESTIGATIONS AND NURSERY INSPECTION. As before reported, the investigation of the blight fungus andthe nursery inspection work are under the direction of Dr. P. D.Heald. Mr. P. J. Anderson has given special attention to certainfield investigations, including the work at Charter Oak. State-ments of some of the principal features of the work here follow:
Text Appearing After Image:
41 GERMINATION OF SPORES. Pycnospores of the blight fungus, sometimes called summerspores, germinate much more slowly than the ascospores, or so-called winter spores. The type of growth and size of colonies aredifferent in the early stages of development on culture media. PRODUCTION OF PYCNOSPORES IN WINTER. In the case of this fungus the term summer spores is very mis-leading, as these spores are produced at all times of the year, beingwashed down in large numbers from blight cankers following eachwinter rain. BIRDS DISSEMINATE THE FUNGUS. Careful experiments show that birds act as carriers of spores ofthe blight fungus. Thirty-six birds belonging to nine differentspecies have been tested. Nineteen were found to carry pycnospores,the maximum number obtained from a single bird, (Downy wood-pecker), being 757,074. The highest number was always obtainedfrom birds shot a few days after a rain period. SHOOTING OF ASCOSPORES. The ascospores are expelled forcibly, but this expulsion depends

Note About Images