File:A text-book of mycology and plant pathology (1917) (14578698030).jpg

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Identifier: textbookofmycol00hars (find matches)
Title: A text-book of mycology and plant pathology
Year: 1917 (1910s)
Authors: Harshberger, John W. (John William), 1869-1929
Subjects: Plant diseases Fungi
Publisher: Philadelphia : P. Blakiston's Son & Co.
Contributing Library: University of British Columbia Library
Digitizing Sponsor: University of British Columbia Library

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uently infect the cereal plant whenit is small, and at or near the surface of the ground. In other cases thefungus penetrates the underground parts or the twigs of trees. Fungigain entrance to plants, through injuries caused by mechanic, meteoro-logic, chemic, or other agents. Mechanic injuries are due to man,animals, or other causes, such as the weight of snow, the rubbing of ^ Harshberger, John W. : How Fungi Gain Entrance to Living Trees. ForestLeaves, viii: 88-90, December, 1901. PLANTS AS DISEASE PRODUCERS 309 two branches together. Squirrels in search of food bite off the twigsof trees. Deer and moose browse upon the tender branches and barkof various trees, the moose especially upon Acer pennsylvanicum andSorbus americana. Grizzly bears rub their backs against the bark oftrees and sometimes in this way decorticate them. Rodents peel offthe outer protective layers of roots as food, or as material with which toline their burrows. The mycelia of Rhizodonia, or the oak-root fungus.
Text Appearing After Image:
Fig. 124.—Street tree injured by use as a hitching post. (After Sturgis, IV. C, Rep.Conn. Agric. Exper. Stat., pi. Hi, 1900.) Rosellinia quercina, which live in the soil, penetrate into roots throughwounds produced by field mice and gophers. The honey agaric,Armillaria mellea, forms strands of hyphae known as rhizomorphs,which grow through the soil and find an easy entrance into rootsdecorticated by rodents. Beavers are active agents in cutting downtrees and removing the bark therefrom. Woodpeckers drill holes intotrees and in their case it has been definitely proved that they carry theviable summer spores of the chestnut-blig^ht fungus, Endothio para- 3IO GENERAL PLANT PATHOLOGY sitica, a single downy woodpecker carrying 757,074 spores.^ Wood-boring insects (Family Scolytid^) of the genera Dendroctonus,Scolytus, Tomiciis are responsible agents in the destruction of treesopening up holes through which fungi may gain entrance. Horsesdo considerable damage to trees by stripping off th

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  • bookid:textbookofmycol00hars
  • bookyear:1917
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Harshberger__John_W___John_William___1869_1929
  • booksubject:Plant_diseases
  • booksubject:Fungi
  • bookpublisher:Philadelphia___P__Blakiston_s_Son___Co_
  • bookcontributor:University_of_British_Columbia_Library
  • booksponsor:University_of_British_Columbia_Library
  • bookleafnumber:326
  • bookcollection:ubclibrary
  • bookcollection:toronto
  • BHL Collection
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28 July 2014
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