215 
not identical with, Rosellinia necatrix 
phora necatrix, Hartig), a parasitic fungus too well known ^ the 
cause of a root disease in German and French vineyards. 
indicate that the fungus under consideration is closely allied to, if 
d (Demato- 
Rosellinia necatrix possesses the power, periph to the 
Maromba fungus, of attacking the roots of almost every kind of 
plant with which its mycelium comes into sone and, when 
of the underground rhizomorphs, which radiate in all directions 
in the soil from each root that is attacked. 
Preventive measures.—Carbon bisulphide has proved to be a 
most effective remedy in preventing the spread of subterranean 
mycelium. Holes are made in the soil about 1 ft. deep, 1 it. 
distant from the stem of the vine, and 2 ft. apart laterally ; half 
an ounce of carbon bisulphide is poured into each hole and closed 
immediately with the foot. The holes are made with an iron rod. 
This PEOATEGIA in da ae is the most effective agent known 
e dis 
isolated by means of a trench bont 1 ft. wide aud 9i . deep. 
Carbon bisulphide e might be used at intervals as feito ‘above, 
on the presumed uninfected side of the trench, as a preventive to 
the extension of mycelium that may not have been included by 
the trench. 
Weeds should not be allowed to remain, as their roots supply 
the fungus with food and aid the extension of its mycelium in 
the 80 = 
ased vines, cue other arcus should be promptly removed 
and peer if allowed to remain and decay in situ, preventive 
measures are practically of no eis as mycelium and conidia are 
being oe produced and diffused from such centres of 
infect 
Finally good drainage is of p importance ; the under- 
ground mycelium extending most rapidl ly and provi ng mos 
deiner when stagnant water is pues in the soil. 
G. M. 
The following peace gives additional information on the 
subject of root-dis 
Root Diseases caused by Fungi. Kew Bulletin, 1896, pp. 1-5, 
pi. x 
P. Viala, ne du pourridié des Vignes, &c. 
G. Masson, Boulevard Saint-Germain, 120, Pori 
J. Dufour, Dema iophðtá necatrix. Chron. Agr. Cant. Vaud., 
12 (1899), No. 4, pp. 87-90. 
. Massee, A Text-book of Plant Diseases. Duckworth & Co., 
"London, 1899. 
