Spur Buight of the Red Raspberry 
19 
Figure 12. Sprayed Canes. 
high. Once located on the new succulent growth, the spores ger¬ 
minate, begin active invasion of the cortex, and in due time the 
characteristic brown splotches appear. 
It is clear from this description of the time and method of in¬ 
fection that if any remedial measures are to be resorted to, such 
measures must be directed toward protecting the young developing 
canes against the attack of the fungous spores, as early in the spring 
as possible. This is best accomplished by covering them with some 
poison or fungicide before the spores begin to scatter, which will 
not permit their growth and development when they alight. 
Too much stress cannot be laid upon the importance of the 
early application of the fungicide or spray material, since it is of 
no value whatever after the fungus has once invaded the deeper 
tissues. Prevention is our only hope of combatting the trouble, 
