Blätter angegriffen

some sort of leaf munching pest. but nothing to crazy. I would likey ingore it.

Caterpillar most likely..........search thoroughly until you find it and remove.

Your outside so no doubt insects, zero metrics on your diary, no details so there is nothing to help with but guess work. Only metric you have consistent is daytime temp which is 72 and too low for photosynthesis to occur at any meaningfull level.

There is a week attached so ofc. Should be answer selected with 4 likes in about 15 mins. Can't suggest anything until you have idea of the root cause. Insects. Fungal. Environment. Accurate identification of the cause is crucial for effective management.