Rollinia leaf discoloration

[kalan]

I have several rollinia deliciosa seedlings that recently began developing these brown veins. Any guess as to the cause? I did notice it happened after a good dose of diluted fish oil fertilizer. Don't know if it's even related. Ideas?
Keith

[kalan]

Bumping to see if the evening crowd has any ideas.
Thanks!
Keith

[HMHausman]

No idea if fish oil could have any effect like that.  The dark lines in the leaf almost look like leaf miner. I haven't heard of any such bugs on rollinia though.

[Bonakyon]

If all the seedlings are affected then the culprit must be the fish oil or some unknown component in it... Is this the first time you used the fish oil fert...? if not have you noticed any similar reactions from previous applications...?

[kalan]

Never noticed similar reactions. Seems to have occurred on already established leaves and only on a few of them. I will take a few more images in the morning.
Thanks for the input.
Keith

Ps. It's not of all of the seedlings but about 1/2 of them.