DISEASES OF CULTIVATED PLANTS 401 
Dying of grape canes has been studied in one vineyard where it appears 
also to be associated with crown gall and to result from other diseased conditions. 
(See circular 64). In this case a portion of the vineyard died out almost com- 
Fig. 54. Illustration showing stroma of a fungus 
believed to take part in death of grape stalks. The separate 
dot-growths are at times united into elongated ridges. 
From Circular No. 64. 
HICKORY 
pletely; followed by sprouting of 
a portion of the roots. In 
August there was wilting and 
drying up associated with dis- 
eased stem conditions. 
The history of this case indi- 
cates that the removal and 
replanting of vines will be more 
successful than to endeavor to 
start vines again by sprouts 
from bases of injured vines. 
White-Rot. Diseased con- 
ditions of the earlier stages of 
black-rot showing light color of 
the berries leads to the use of 
the term white-rot. As yet, how- 
ever, the writer has never con- 
clusively proved that we have a 
white-rot development different 
from this stage of the black-rot of 
the grape in Ohio. Where grow- 
ers suspect this form of rot the 
method of treatment is the same 
as for black-rot. 
GRASSES 
Anthracnoses, Smuts and 
Rusts are found upon the grasses. 
These are in part described 
under blue-grass, orchard- 
grass, red-top, timothy, and 
chess. 
HAZELNUT 
See Filbert. 
HEMLOCK 
Hemlock grows freely with 
us and is apparently quite free 
from foliage troubles. 
Heart-Rot (Zrametes pini : 
(Brot.) Fr.) and Sap Rot (Fomes 
pinicola (Sw.) Gill) are reported 
from districts where special 
attention is given to the 
conditions. 
Leaf-Spot. <A hickory leaf-spot (Marsonia juglandis (Lib.) Sacc.) is quite 
general and leads to dying of the leaves prematurely. This really merits much 
closer study than has yet been given it in our state. 
