Spur Blight op the Red Raspberry 
Figure 2. 
As a result of six years of observation, we believe that no one 
factor alone is responsible for this state of affairs, but rather that 
it has come about through the combination of several, among 
which we may mention the following: Late frosts, method of 
covering and time of taking up canes, poor cultivation, age of plan¬ 
tations, and injury caused by Sphaerella riibina. 
LATE FROSTS. 
One of the most disastrous things that can befall a raspberry 
plantation is to have a killing frost late in the spring after the 
new canes have begun their growth, and are from 12 to 15 inches 
high. Frequently, we have a warm, sunny April with moisture 
conditions just right to produce a rapid, vigorous development of 
the young canes, and then the first or second week in May we will 
have a freeze that may damage the new canes very considerably. 
This is exactly what happened in the springs of 1909 and 1910. In 
the latter year, the spring promised to be an early one ; the berry 
bushes had been uncovered and taken up, and many of the young 
canes were 12 to 15 inches high. About the middle of May there 
