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This disease can cause young leaves to curl and turn purple . Finish by covering with chicken wire to hold everything in place . This can create " mini-epidemics " in the home landscape , and leave the homeowner frustrated.Fig . Spores are spread from infected leaves to healthy leaves by splashing water and the mechanical rubbing of two leaves . Gooseberries and currants , although closely related , can easily be identified by examining the canes and fruit color ; gooseberry canes normally produce a spine at each leaf node and bear roughly grape-sized berries singly or in groups of 2 or 3 , while currant canes lack spines or prickles and bear 8 to 30 smaller fruit in clusters ( figure 1 ) . If leaf streak develops , remove infected leaves to slow the spread of the disease . An important result of PHC is that roses in healthy condition are less impacted by insects than plants under stress .