Can anyone tell me what this is?

[Jonze]

I thought all was going well but I just noticed today that one of my sweet deep grapefruit plants leaves look a bit patchy, I haven come across this before.

They are nearly 2 weeks into 12/12 in plagron royal mix soil. Fed for first time 2 days ago with half strength canna bio Flores, until then just water with bio boost and bio rhizotonic and foliar with bio boost and seaweed 3 times a week until now. Thanks.

[Ye Old Pioneer]

Is it not just residue from the foliar feeding and the light magnifying the droplets n burning the leaf???? Am pretty wasted here n can't really see straight so could be well off lol

[Jonze]

Thanks for your response mate. I'm not sure? It's only on 1 plant out of 6? :/

[Jingo]

Have you looked under the leaves for bugs they'll attack a week plant first.

[MrChedHead]

Thrips maybe 😖

[Jonze]

Thanks guys. I'll have a real good look when lights come on. I haven't seen any bugs this grow. Not even 1 fungus gnat so I don't know :-/

[Jingo]

Well if you don't find any bugs , I'd just keep on going and not worry about it.

[Jonze]

No bugs. I'd like to find out what this is tho even if it is nothing to worry about. Seems too uniform to be burn from foliar?

[Jingo]

I've seen something similar in Hydro from pH swings but I know you're not doing Hydro so I didn't even bring that up.

[MrG]

Maybe sulphur or zinc.