There are several reasons why bean leaves yellow. It could be root rot which is due to overwatering. Or, it could be lack of sunlight as beans need at least 6 hours of direct sunshine. Or, it could be lack of nitrogen in your fertilizer. Another common reason for yellowing leaves is bacterial blight which is introduced to a field by infected seed. A fungicide spray can sometimes halt the disease. Finally, yellows leaves can mean mosaic virus. Unfortunately, there’s not a lot you can do. Remove infected plants and purchase only disease-resistant seeds. See more about bean diseases: http://www.extension.umn.edu/garden/yard-garden/vegetables/edible-bean-disease-and-disorder-identification/
There are several reasons why bean leaves yellow. It could be root rot which is due to overwatering. Or, it could be lack of sunlight as beans need at least 6 hours of direct sunshine. Or, it could be lack of nitrogen in your fertilizer. Another common reason for yellowing leaves is bacterial blight which is introduced to a field by infected seed. A fungicide spray can sometimes halt the disease. Finally, yellows leaves can mean mosaic virus. Unfortunately, there’s not a lot you can do. Remove infected plants and purchase only disease-resistant seeds. See more about bean diseases: http://www.extension.umn.edu/garden/yard-garden/vegetables/edible-bean-disease-and-disorder-identification/