Seedlings turning white

[Mortgagelifter9]

All of a sudden after about 5 weeks. My seedlings are turning white. The plants still look robust oddly enough but the discoloration is prominent especially on the upper leaves that receive the most light. Any suggestions or insight is welcome. I have pix.

[travis]

Let's see the pictures.

Are you using high intensity lighting of some sort? I'm assuming your seedlings are inside, and not exposed to harsh sunlight or wind?

[fortyonenorth]

Are the leaf veins still green or is the entire leaf white? Iron deficiency manifests with light yellow or white new leaves while the veins will remain green - a "road map" effect.

[Wi-sunflower]

If you just moved them out doors or from inside to a greenhouse or cold frame, your problem could be sunburn.

Plants that were thriving in lower light, moved to high light will burn sunscald til they are used to the light.

Carol

[Mortgagelifter9]

based on what I have done which is move them outside during the recent warm weather, I am certain it is sunscald. Thanks for all the responses. COuldn't figure out how to upload a pic

[dice]

Sunburned leaves will set them back a bit but not kill them.
Once they grow some new leaves, you can cut off the damaged
leaves.

See "hardening off" for how to avoid this problem.