File:Diseases of deciduous forest trees (1909) (20974357291).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

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:
MISCELLANEOUS PARASITIC AND SAPROPHYTIC ORGANISMS. 15 ward to southern California. Throughout southern Ohio, Indiana, Illinois, and Missouri it is found chiefly on the black gum (Nyssa sylvatica Marsh.). In the Southern States it is found on almosl all species of deciduous forest trees, including the sycamore (PlatamtA occidentalis L.), elm (Ulmus americana L.), oaks (Quercus sp'.), red gum (Liquidambar styraciflua L.), ashes (Fraxinus sp.), Cottonwood (Populus deltoides Marsh.), and many others of the smaller shrubby species of trees, like the mesquite (Prosopis juliflora (Swarl z) DC.). Where it is present in any large quantity, the mistletoe is regarded as a serious enemy of the trees upon which it grows. In the more or less virgin forest tracts of the Mis- sissippi Valley, extending from southern Missouri into Arkansas and northeastern Loui- siana, many tracts are found which are so badly in- fested as to se- riously interfere w i t h the annu al rate of wood accre- tion. In the ex- treme Southern States vigorous ef- forts are being made to prevent the at- tack of the mistle- toe, which has be- come a serious enemy to forest and shade trees in southern Louisiana and Texas. The become literally covered with this p parasite is distributed from tree to tree chiefly by birds, and when it has once obtained a foothold in any given region, practically every tree in that locality is affected by it. The parasite is a peren- nial and gradually absorbs the food materials from the branch upon which it is situated, and not only kills off that part of the branch toward the outside of the tree from its point of attachment, but also causes the formation of large swellings, or tumors, which are most characteristic in the black gum. Figure 1 shows the extent which the oak may be attacked by this parasite.
Text Appearing After Image:
Seme trees 7Q1R9 R„l 1.10 HQ_

Note About Images