First time. Outdoors in soil (not pots). One plant. This problem suddenly developed over last 2-3 days. Brown spots. Not widespread - but curious why suddenly at this late stage. Hoping to get through the next 2-3 weeks before harvesting. In northern OH. Should not be calcium deficiency problem but appears to most closely match this photos I see on the internet. Soil PH is good (around 6.5-7. Getting some Cali-mag tomorrow - opinions on if that is the correct approach. Other suggestions? Thanks, in advance.