Q.Green Bean Plants Are Yellowed With Brown Patches And Darker Veins.
Have never seen this in over 50 years if gardening. I started no-till, raised-bed gardening two years ago. Last year, the beans were good. I did not add any fertilizer, thinking the decomposing mulch created enough nutrients. I mulch with pine needles and add lime to the soil. Have been doing this for many years with no problems. Plants have been covered by fine mesh netting, due to rabbits. I added some fertilizer after the leaves started to yellow, but saw no improvement. We have been under severe drought conditions until recently. Basically, the main difference is not tilling the soil, just digging down two, three inches to plant. I may have sent this question twice. Internet failed as I was sending the first time.

Certified GKH Gardening Expert
That reminds me, a lot, of the common bacterial blight. To effectively treat blight, it is important to follow a few key steps. Firstly, remove and destroy any infected plant material to prevent the spread of the disease. Secondly, practice good sanitation by regularly cleaning and disinfecting tools and equipment used in the garden. Additionally, ensure proper plant nutrition by Implementing crop rotation and avoiding overcrowding of plants can also help prevent the disease. Finally, consider using fungicides as a last resort, following the instructions and recommendations provided by the manufacturer. Regular monitoring and early detection are crucial for successful treatment of blight. These articles will help:
https://www.gardeningknowhow.com/edible/vegetables/beans/bacterial-bean-blight-control.htm
https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm