BULLETIN 
TORREY BOTANICAL CLUB. 
Vol. XIII] New York, October, 1886. [No. 10. 
Notes on the Orange Leaf Scab.* 
By F. LAMSON SCRIBNER, U. S. Dept. Agriculture. 
Last summer, and also during the present season, there have 
been received at the Department of Agriculture Orange leaves 
that were diseased or injured through the action of some agency 
not yet well understood. 
Mr. Chas. W. Campbell, writing from Ocala, Florida, July 
29th, 1886, says that “the disease first made its appearance last 
summer and seems to be increasing the present season, particu- 
larly on young trees making vigorous growth. It seems to be 
confined to sour stocks, although this season it has appeared on 
Lemon trees. No sweet Orange trees have been affected, nor 
the sweet buds on sour stocks, even when growing side by side 
with trees badly affected. It is very destructive to the growth 
of trees, and ruinous to young nursery stocks, so that fears are 
entertained that it will seriously affect the Orange interest unless 
means are discovered for checking it. Last season and this have 
been exceedingly wet, and the appearance of the fungi may be 
due to this fact.” 
I desire to call attention to this subject more especially 
because there seems to be no literature upon it, and there is 
a probability that the disease in question is new; it is at least, 
of very recent appearance in Florida. The samples received ex- 
hibit a malady of a serious nature; one certainly deserving care- 
ful investigation. The entomologists affirm that there is no 
evidence nor probability of its being caused or induced by in- 
sects. 
* Read before the Botanical Club of the A. A, A. S., Buffalo Meeting, August, 1886, 
