Lombardy Poplar tree leaf rust

Asked November 13, 2019, 1:11 AM EST

Will Lombardy poplar tree leaf rust infect my roses ? I have a huge Lombardi popular tree in my front yard. I live in Vancouver BC in the Pacific Northwest.. her leaves are infected with the brown and black spots: a fungus.. Can I use these leaves from the Lombardy poplar to put in my compost ? I am afraid when I use the compost soil , it will infect my roses. Thank you so much , Tim Garrison

Outside United States

1 Response

Thank you for your question, Tim. Assuming you have the rust (Melampsora) correctly identified, the spores will not be a risk to your roses, which are host plants to another species of rust fungus (https://hort.extension.wisc.edu/articles/rose-rust/) However, not raking up leaves infected with Melampsora rust, or composting them, will just increase the fungal population in subsequent seasons. Here is an Extension article about this and two other poplar rusts, and what measures to rake: https://extension.colostate.edu/docs/pubs/garden/02920.pdf Hope this helps. Good luck!