How to Prevent Edema in Tomato Plants

by Mark
(Cincinnati)

Hi,

I've been battling significant leaf problems. The leaves
get lighter green (to yellow) spots on the top and
woody looking warts on the underside. Also, the stem
has turned brown to the point of looking like it has bark
on it.

I sent photos to customer service at tomato growers
catalog and they came back with edema, where the plant is reacting badly to too much water available at its roots.

That seems like the definition of hydroponics. I have four plants
in dutch buckets. Two have a 50/50 mix of coco coir and
pearlite. The other two have all hydroton. Plants are in
the bloom phase. I'm feeding three times per day for 15
minutes and lights on for 12 hours per day. I only feed
during light hours and the last feeding is 2 hours before
lights out.

I have a fan that blows across the plants. I have it turn
off with the lights and an exhaust fan comes on and cools
the grow chamber from 77 degrees to 69 degrees in about
15 minutes. The exhaust fan does not run much at night after
the temperature gets to 67.

Any advice on how to prevent the edema?

Thanks,

Mark

Answer from Stella/Simon:

hi Mark,

My honest opinion is you're letting them get too cool at night. Tomatoes are heat loving and should ideally stay in the high 70s at night. Why not give this a try?

Hope this helps!

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