They are outdoor plants about 9 weeks old. The bottom leaves are turning yellow on all 12 plants. The rest of the plant looks healthy but not dark green. This picture is the worst leaf, the others are not as bad and without bite marks.
Thanks for your reply Covertgrower. They are still in veg, do outdoor plants have leaves that die off during veg? My indoor plants don’t. They get full sun for 8 1/2 hours a day so that’s not the problem. It has been very hot and humid here (Maine) 90’s all week, 97 today 80% humidity. What other reason?
Yellowing leaves from bottom up can be a sign of nitrogen deficiency or lockout too. I’m not really sure how your grow is setup though. If they are in pots you could grab some runoff and check ph and ppm to get an idea if either apply.