I am uploading images of pole bean leaves. I use a moisture meter to decide whether to water. On about 10 of my 40 or so plants, some leaves show loss of green color which leads to drying out and becoming brittle in spots. and small holes/tears. IT LOOKS A BIT LIKE LEAF MINERS. I do have leaf miners on nearby chard and beets, which is a minor problem this year compared to last 3 yrs. I control by removing infected leaves and rubbing off eggs. I HAVE NOT SEEN EGGS ON THE BEAN LEAVES. Is this a pest, a disease, over/under water, or nutrient problem? Thank you.