Disease on pole beans - Ask Extension
I am growing Fortex pole beans (https://territorialseed.com/products/bean-fortex) and two plants have developed a disease. The newer-growth leaves bec...
Knowledgebase
Disease on pole beans #837704
Asked June 26, 2023, 6:29 PM EDT
I am growing Fortex pole beans (https://territorialseed.com/products/bean-fortex) and two plants have developed a disease. The newer-growth leaves become bumpy with purplish areas on the top and red/brown veins on the underside.
I don't know if it affects the bean pods yet since none have formed. The disease doesn't seem to affect older growth (yet), but it may be spreading from the top to bottom.
Do you know what this disease could be?
Washtenaw County Michigan
Expert Response
Hi, thanks for the question.
First take suggests that there may be a phosphorus deficiency. This may be due to colder than usual temperatures where phosphorus uptake can be an issue or just not present in the soil. Phosphorus is somewhat mobile in plants so the plant will supply the phosphorous from the older leaves. Check out these links:
Phosphorus Deficiency — Research — Department of Plant Science (psu.edu)
Growing eggplant in home gardens | UMN Extension
Anthracnose can also show rust-colored veins. See link below.
Rust colored veins and spots on Pole Bean leaves - Ask Extension
I hope this is helpful.
