Marks on the leaves

Hello,

I am finishing vegetation phase on my canalope haze strain(day15). I noticed a change of color on the leaves. There is only 5% plant like this but i want to solve the problem in early stage. I am using Athena pro line and work according their chart.

It's just variegation. It's common to see it on young seedlings, and often they outgrow it. Some plants only express it, or express it more, when it's unhappy with pH or whatever you're feeding it, etc.

Long story short, it isn't something to stress over too much.

You'll see variegation frequently in plants with Chem, Haze, or OG lineages (and I'm sure there's others too)

Most commonly I see it on young seedlings that quickly outgrow it. They look very similar to the variegation you're seeing.

Other plants, like the chems, og's, hazes, tend to express it in a repeating pattern, like maybe one blade of the fan leaf is half yellow every so many nodes.

There is some debate about whether it's a sign of stress, or viroids even. I think it certainly can be a stress indicator, but it's hard to say when some plants show it no matter what.