Drought Stress, nothing to worry about. You're going to get normal leaf senescence on the older growth as the plants mature anyway, but heat and lack of rain exacerbate the symptoms with the marginal browning,
I got the same thing when it was hot and dry for an extended period of time. Brandywine's seem to show this yellowing and browning on the lower leaves more than other varieties most times.
When I increased watering during the dry times, the symptoms went away.
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