60 Farmers’ Bulletin 1220. 
This disease is rather common in the vineyards of New York, 
Pennsylvania, Ohio, and Michigan. 
TREATMENT. 
Spraying does not prevent this disease. As soon as the first con- 
spicuous symptom of the disease is noticed, which is the development 
of weak, slender shoots, with small yellowish leaves, as shown in 
figure 69, an examination should be made of the vine between the 
Fic. 67.—Dead-arm disease of grape. The portion of the vine above the lower wire 
has been killed by the dead-arm fungus. The point of infection is just above the 
lower trellis wire. The parasite has girdled the vine at this point, causing the 
death of the portion above. 
point of origin of this weak shoot and the next healthy shoot below, 
in order to locate the diseased spot or canker. Having located the 
canker, the vine should be cut off far enough below this to be sure 
of removing all of the infected wood. These prunings should be 
burned at once. } 
If the canker forms on the main trunk below the arms, the vine 
should be cut off near the ground. The root will then send up 
vigorous, healthy shoots. The disease apparently does not attack 
the roots. 
