Raspberries are plants that require good exposure to sun. However, my black-raspberry plant has been getting scorched of late. Typical signs of sun-scorching are when the older leaves start drying out (see photo), turning brown and papery (crumbles if you press). The new leaves are unaffected though.
I live in San Diego, and the weather here over the past two months has been between 65 and 75 F (and will remain the same until December). The plants get about 8-10 hours of sun everyday. In short, it's heaven for humans, but not for my raspberry plant.
Firstly, am I even right in diagnosing this as sun-scorching? If so, how can I prevent it? The obvious option would be to move it to a place with more shade. However, I'd rather wait till Jan-Feb when it'll be dormant, to move the plant. An alternate would be to cover it with a black netting that cuts the sunlight, yet allows it to breathe. However, I don't have much experience with these. What are my options given the constraints?