97 
As will be seen from the following 1 somewhat free translation from 
Pierre Viala’s work (The Diseases of the Vine, p. 432) the malady cor¬ 
responds in many respects to what this eminent viticulturist calls Rou- 
geot and which he considers a mild form of the destructive Apoplexie 
which has been long noticed in France. 
Grape leaves sometimes suddenly assume a red color, especially in midsummer at 
the heated periods when there are strong dry winds or when the temperature falls 
suddenly. The leaf tissues become leathery and fragile between the veins, and the 
color, which normally would be that of a dead autumn leaf, is a bright, almost rose 
red and at times a wine color, while the veins remain green or yellowish, later the 
color becomes dull and the leaves dry up. 
The yellowish shoots dry up, beginning at their bases. But the vine is not diseased 
beyond recovery as is the case with Folletage. It puts out green branches in the 
course of the same year and in the following year the only evidence of the disease is 
a slight weakness of the vine. 
G. Foex, in bis Complete Course of Viticulture.* thus describes uoder 
the same name a disease which he considers somewhat distinct from 
Apoplexie or Folletage : 
Rougeot is a disease which resembles Folletage in the conditions which cause it as 
well as in its general effects. Like this, it attacks the vine while it is in full growth, 
at the first heated period, and prevails especially in deep and cold soils. 
Thiebaut de Berneaudt says that it is produced during the summer after a cold 
rain, a storm which suddenly lowers the temperature, or even a fog, when these are 
succeeded by warm south winds. 
M. Mares + gives the following description : 
“The leaves change, becoming like parchment, and lose their flexibility; the tissue 
between the nerves becomes red, while the nerves themselves remain green, giving 
the leaves of diseased vines quite a peculiar appearance; the berries shrivel, the canes 
remain yellow, and if the malady becomes more severe the leaves dry up entirely and 
the canes partially die—rotting from the extremity to the base. A vine is sometimes 
attacked only upon one side, which becomes brown, while the other parts remain 
green. * * * The vines diseased with rougeot do not die, as in the case of apo¬ 
plexie, but are much injured, and their natural fertility is considerably diminished, 
only recovering after several years. Drainage appears to be, as in the case of apo¬ 
plexie, the best means of diminishing the chances for the development of this malady.” 
While the above descriptions contain many conflicting statements it 
is reasonably certain that the malady seen by the various authors is the 
same and is probably of a like nature to the one in question. Viala in 
his Mission Viticole en Amerique mentions folletage, of which he con¬ 
siders rougeot a mild attack, as occurring in the Atlantic States, 
especially in the South. 
A careful microscopic examination of all parts of the diseased vine 
has revealed absolutely nothing of the nature of a parasitic fungus 
which could in any way be connected with the malady. Leaves, canes, 
*Cours complet do Viticulture, par G. Foex, Paris, 1868, p. 421. 
+ Nouv. Mauuel complet du Vigneron frangais. Manuels Roret, p. 18G, quoted by 
Foex. 
tDes Vigues dans le Midi de la France in le Livre de la Ferine, Paris, Masson, 1865, 
p. 173, quoted by Foex. 
