written by Sarah F.
Client is growing Royal Burgundy bush beans from a reputable seed company. The plants are not thrifty, robust yet have some dark green leaves. The leaves exhibit yellow splotches and streaking as well as fungal leaf spots, necrotic tissue, and upward cupping. These symptoms and sign did not fit either virus or fungus.
After about an hour of 4 of us puzzling, reading, exploring the internet in all the usual diseases of veg placees for info, we happen upon this site:
and found this fascinating bit of info which is also below the second picture.
Foliar chlorosis and necrosis resulting from a genetic disorder called crumpled leaf, a genetic trait called crumpled leaf or LCR caused by an incompatible developmental reaction when beans from different centers of domestication are crossed, e.g., crosses of Mesoamerican bush blue lake materials with Andean Midwestern types of beans. Symptoms can resemble those caused by virus infections. Lines with the trait may vary in intensity of expression, and the expression can vary over the season.
Here is our response to the client with our best guess- something to do with the open pollination seed source. We found this so interesting and all learned as we explored together. Clinic is fun.
Sarah
Thanks for your question.
This is what we found after looking at many diseases and ruling them out.
Since your Royal Burgundy beans are open pollinion source and the plants are not very big or robust, our educated guess is that you may have a genetic variation. The good news is that open poliination helps with biodoversity
and the bad news is that the plants will be varied from this seed source.
https://en.wikipedia.org/wiki/
Remember to rotate crops and don’t plant beans in that area for 4 years.
Photo Source: Lindsey du Toit, Washington State University
