Bumps on my tomato seedling leaves

[Mick Emery]

My tomato seedlings are about 3 wks old. They've been under grow lights since germination.
Today, I noticed clusters of bumps on the upper side of the leaves.
Anyone know what this might be?

 

[Chuck]

Without a picture impossible to say, but it is probably oedema which is caused by too much water

 

[Toddz]

I ditto what Chuck said. I get them and I just back off my water. However they don't cause any problems for me.

 

[Mick Emery]

Bumps are gone but now this...

 

[Chuck]

That is the aftermath of too much water, the yellowing and browning/drying of leaf margins. The yellowing is probably caused by the leaching of nutrients from the soil from too much water, especially if you were fertilizing with synthetic fertilizers. With the browning/drying there isn't anything you can do now. Just don't water as often and the plant will be fine. You will have to fertilize again if the yellowing doesn't stop. You should separate your seedlings now before they get a fungus. Either that or place an oscillating fan close by.

 

[Mick Emery]

That is the aftermath of too much water, the yellowing and browning/drying of leaf margins. The yellowing is probably caused by the leaching of nutrients from the soil from too much water, especially if you were fertilizing with synthetic fertilizers. With the browning/drying there isn't anything you can do now. Just don't water as often and the plant will be fine. You will have to fertilize again if the yellowing doesn't stop. You should separate your seedlings now before they get a fungus. Either that or place an oscillating fan close by.

Thank you.