Spots exclusively on sugar leaves

Greetings,

Just starting week 9 of 12/12. Plants are Green Crack from seed. Running in coco using FloraNova Bloom at an EC of 1.0-1.1, runoff ~ 1.3-1.4 EC, pH 6.1.
Light intensity is approx. 1000 umols, 83-84f, 65-70% RH
In the past few days noticed some brown spotting just on some of the sugar leaves, not elsewhere on the plant.
I haven't experienced this before and have come up empty looking for similar symptoms.

Any ideas?

I also have some of that happing. How would I treat that?

What I can see of the plant looks good so don't do anything drastic. You're late in the grow so you may have some nutrient lockout - possibly calcium and magnesium but I'm not an expert so see what other growers say. You can feed a couple of times with a low feed strength to get rid of any salt build up and help with nutrient uptake. You can try some cal-mag, especially if you're using RO or real soft water.

Thanks

So damn frosty it's hard to tell.

A little follow-up. It seems the problem was caused by my EC falling a little too low. I bumped my feed up to EC 1.2 and the spotting issue has not progressed. The spotting only occurred on maybe 10% of the sugar leaves so it seems I caught it early enough.

FWIW, in my case the issue wasn't caused by any lockout. My feed EC was/is quite low, my runoff EC was/is always fairly close to my my input EC.

Billy the Mountain said:

A little follow-up. It seems the problem was caused by my EC falling a little too low. I bumped my feed up to EC 1.2 and the spotting issue has not progressed. The spotting only occurred on maybe 10% of the sugar leaves so it seems I caught it early enough.

FWIW, in my case the issue wasn't caused by any lockout. My feed EC was/is quite low, my runoff EC was/is always fairly close to my my input EC.

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Good to hear, have fun watching them fatten up! How do you like the Floranova? I've used Floratrio and most recently Canna coco a&b. I like the simplicity of a 2 part system but haven't tried floranova yet.

I've tried many of the available nutes but FloraNova Bloom seems to work best for me and the price is reasonable. Its quite concentrated compared to other liquid nutes (FN is actually more of a milkshake consistency). I generally use 3-4ml/gal, so a quart will create ~ 300 gal of nutes.