182 TRANSACTIONS OF THE 
FOREST TREE DISEASES. 
BY A. O. GARRETT. 
The subject of “Forest Tree Diseases” is indeed 2 
very comprehensive subject to be discussed in the very 
brief time allotted to me for this paper. For such dis- 
eases fall under two general heads: those caused by in- 
sects and other animals, and those caused by plants, (not 
considering still a third type caused by physiological dis- 
turbances, etc.) 
In order to limit the content of the paper, I shall dis- 
cuss only those diseases caused by plant parasites 
and saprophytes and further limit this to those which 
have been found in Utah. 
Of plant parasites which are Spermatophytes, or 
flowering plants, doubtless the most conspicuous are those 
belonging to the mistletoe group. As occurring in Utah, 
these are found on coniferous trees only; and so far as I 
can recall, in the southern portion} of the state only, Manti 
being my northernmost Utah locality. Mr. I. E. Diehl 
informs me that he has collected Razoumofskya divaricata 
on Pinus monophylla and Phoradendron juniperinum on 
Juniperus utahensis, both in the Tintic Mts., Juab Co. At 
Manti is found Razoumofskya divaricata (Engelm.) Kuntze 
(Arceuthobium divaricatum Engelm.), the common mistle- 
toe on Pinus edulis, the pinyon pine. I have also collected 
this species in the La Sal Mts., and it is probably to be 
found wherever the pinyon pine is to be found. Another 
species, R. americana, is found in Colorado, and prob- 
ably occurs in Utah. Along the brink of Bryce’s Can- 
- yon all the pines are “shot to pieces” by mistletoe infec- 
tion. Pinus edulishas the first named mistletoe; Pinwe 
scopulorum (the yellow pine) has 2. cryptopoda (Engelm.) 
