Feb. 15,1925 Root Rot of Grapevine Caused by Clitocybe Tabescens 363 
The present investigation affords very 
definite evidence that Clitocybe root 
rot, which hitherto has been certainly 
known to attack only fruit, forest, and 
shade trees, is responsible for a con¬ 
siderable quantity of root rot of grape¬ 
vines, at least in Missouri, and prob¬ 
ably also in other southern States. 
The isolation of this fungus by the 
writer from the roots of recently 
killed vines but 70 miles from the point 
where root rot of the grapevine was 
first discovered in this country indi¬ 
cates that Clitocybe tabescens was the 
cause of the case first reported rather 
than Armillaria mellea, as is generally 
believed. 
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