File:Diseases of deciduous forest trees (1909) (20966908005).jpg

Title: Diseases of deciduous forest trees
Identifier: diseasesofdecidu00vons (find matches)
Year: 1909 (1900s)
Authors: Von Schrenk, Hermann, 1873-1953; Spaulding, Perley, 1878-
Subjects: Trees -- Diseases and pests
Publisher: Washington : G. P. O.
Contributing Library: NCSU Libraries
Digitizing Sponsor: NCSU Libraries

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MISCELLANEOUS PARASITIC AND SAPROPHYTIC 0BGANI8MB. 17 is known as a "witches' broom." (See fig. 2.) During the course of the development of these witches' brooms the sap becomes diverted more and more completely from the outer end of the affected I.ranch to the broom, and finally that part of the branch located beyond the base of the parasite dies. These witches' brooms vary much in size being from only a few inches in diameter to as much as several feel in diameter and in height. The distribution of the seeds is such thai a tree once infected, is almost sure to become more affected as time goes on, so that in extreme cases there seems to be little doubf thai large trees may be entirely killed by the effects of this plant. The senior writer (77) has referred to the apparent destructive action of this plant. It is evident that the most practical method of eradicat- ing this parasite is by cutting all of the af- fected treesand burn- ing the infectedparts. It is believed that a number of epi- phytic plants some- times bring about a diseased condition of deciduous trees by smothering the younger leaves and branches. (See fig. 3.) The southern moss (Tillandsia usneoides L.) is be- lieved by many to cause the death of leaves and branches of the live oak (Quercus virginiana Mill.), red gum (Liquidambar styracir flua L.); and other deciduous trees. The dense masses of this plant frequently cover the growing parts of the tree and deprive them of air and light. Another species, TiUandsia recurvata L., has recently been reported as killing the live oak (Quercus virginiana Mill.) and pecan (Hicoria pecan (Marsh.) Britton) in southern Texas. In the Northern States mosses and lichens frequently grow in such profusion that injurious results follow. Tin- is par- 149
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Fig. 3.—Spanish moss on a large oak tree. Note that the branches bearing the moss are dead.

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