Plant Issue Never seen before

[Cocktrauma]

High Guys
I am running a autopot grow with Biotabs 50/50 perlite peat under a 315w CMH bulb.
I had several runs with this setup always performing decent but this time I got the molding leafs tips you can see on the pictures.
Any idea what's going on?
I have seen several deficencys and diseases over the time but never this one...
Hope you can help me

Big thank you <3

 

[thumper60]

What have you been spraying? looks like some kind of oil based product.

 

[RuggedWombat]

I'm going to second the leaves having an oily sheen to them. It looks like something was sprayed on them directly and now the light is breaking down the top layer. Not sure about the blackening and shriveling of the ends of the leaf though.

 

[Cocktrauma]

I treated them with a product against Thrips which leaves an oily residue but is not harming the plant... Used it alot before.
I am talking about the black leaf tips which I've never seen before ;(
Thanks for you reply guys
Hope somebody has seen it before

 

[tstick]

The first thing I saw was a dried residue on the leaves that is most likely suffocating preventing the plants from transpiring.

 

[tstick]

Did you use a dedicated sprayer for applying the oil? Or did you possibly use a sprayer that might have been used for something else. too? It really looks like the results of being sprayed with some kind of herbicide.

 

[HydroKid239]

I treated them with a product against Thrips which leaves an oily residue but is not harming the plant... Used it alot before.
I am talking about the black leaf tips which I've never seen before ;(
Thanks for you reply guys
Hope somebody has seen it before

How much time elapsed from the time you sprayed, to the time the lights come on? You could inadvertently brought on the burn by spraying too close to “lights on” time.