File:A text-book of mycology and plant pathology (1917) (14578689820).jpg

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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evere ice storm visited the mountain region of Pennsylvania contiguous to the Juniata Valley and Susquehanna River. During the afternoon of Saturday, Feb. 12, 1916, a cold rain began which continued well into the night, coating the pavements, streets, and trees with hard ice. On Sunday morning, Feb. 13, men, boys and girls took advantage of the icy streets to skate ^ Illick, J. S.: a Destructive Snow and Ice Storm. Forest Leaves, xv: 103-107, February, iqi6. 286 GENERAL PLANT PATHOLOGY upon them and this unusual sight was stopped by a snow storm, whichfollowed on Sunday morning. The trees were loaded to the breakingpoint. During the continuance of the storm, small branches weretaken off thirteen trees and shrubs and a blade of grass growing in WestPhiladelphia, and the thickness of ice upon them measured with apair of compasses. The accompanying figures drawn life size show therelative thickness of the load of ice borne by the twigs, whose thicknessis shown in the drawings (Fig. 113).
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Fig. 114.—Happy white ehn, Ubnus americana, plentifully supplied with groundwater near the surface in a depression of the glacial outwash plain at Westbury,L. L, July, 1915. The fall of hail stones may, if they are large enough, cause thedecortication of twigs, or the abrasion of other plant parts, thus per-mitting the entrance of destructive bacteria and fungi to the interiorof the plants. Wind is an active agent in the breaking off of buds and limbs andthe formation of dangerous wounds. In such situations, as high moun-tains, sand dunes and rocky shores, where trees are exposed to theforcible action of the wind, they assume a windswept, bisected, orprostrate form, which is characteristic and picturesque (Fig. ti6). GENERAL CONSIDERATION OF PLANT DISEASES 287

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