Thank you for your question. The first photo with yellowing leaves resembles a nutrient deficiency or other abiotic cause. Have you had a soil test and made sure that you are meeting your plant's fertility requirements?

The second photo where leaves are greener but there is still necrosis, sometimes not just as the leaf margin, is a little more questionable. You can send in samples to the diagnostic lab on campus to test for presence of a bacterial or fungal disease: https://www.canr.msu.edu/pestid/submit-samples/. If your neighbors are experiencing similar issues at different sites, that could suggest presence of some pathogen that has been spread around.