Figure 



I'Lsen.sc cvcle of rasni-.errv utiir hli'-,l:t. 



1 7- 



From 

 spring through 

 summer mature 

 spores are released 



CIDCHDt 



During winter, spores develop in 

 infected tissue in plants Infected 

 canes are weakened 



Spores land on 

 susceptible tissue and Invade 

 First symptoms are dark areas 

 in leaves 



Purple lesions develop on the base of new canes, 

 especially around petioles, during sum mer 



