This accidental introduction does not appear to be infecting native vegetation, so it offers hope for reducing the impact of invasive blackberries in the Pacific Northwest.

The foliar symptoms that can be found include purple leaf spots along with yellow and tan centers.

The pathogen is a macrocyclic, autoecious rust fungus, and produces five different spore states that represent the asexual and sexual components of the life cycle.

Cultural tactics along with dormant season lime sulfur can help to reduce the initial inoculums source.

[5] The release of the additional strains can originate the potential to increase the genetic diversity of the population of P. violaceum.

The occurrence through recombination or the increase in the effective population size can in turn improve the impact of the biological control agent.