Backyard Aquaponics
A place to discuss aquaponics

Recently am facing some issues with Red Oak lettuce, with older growth seemingly rotting off.

I attached 2 pics, 1 showing leaves that have rotten off, and anothet shows leaves starting to be affected. The rest of the plant looks normal (root growth is good and white as can be, younger growth looks crisp).

I have green oak, cos, and other lettuce varieties in the dwc system but it seems to affect only red oak. I use sponge in netcups for the dwc, could it be a case that water is getting to the stems and soaking the leaves, thus resulting in such rot? I also have a misting system in the greenhouse.

pH in the 6.7-6.8 range, ammonia, nitrite looks good and nitrates in the 50ppm range.

Any ideas will be greatly appreciated.

I dont do DWC like that. I use a flood and drain system. But I have had similar rot problems when I get the plants to deep or water level rises to much. Now I just put the plants deep enough to get the roots wet. Then fill in with clay pebbles or gravel to give the plant the support it needs. Make a nice dry couple inch deep layer prevents mold and rot problems on the stalk.

Use a foam spacer to lift the stalk out of the damp zone so it can dry out.

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