Brownish Rust burns on plant leafs

[drknow1104]

Hi,

I noticed these brownish rust burns appear on one of my plant's leafs 2 days ago. Since then they have spread to another leaf but dont seem to be getting too out of control. :confused: Can anyone please tell me what it is caused by? It appears to be a PH burn of some sort, maybe.

Please check out attached photos for reference. Thankyou.:thumbsup:

DrKnow

[Weedhound]

Did you check your ph?

[dutch.lover]

nute burn?

[drknow1104]

Yeah i check the PH of every solution i mix up. of recent i have been having to up the PH from 4.9 to 6.3.

I doubt it is nute burn as i have them on a very low concentration of the stuff at the moment. Plus when i have had nute burn problems it has usually looked something more similar to "the claw" (i.e. leaf is curled up inside on its self)

[harris7]

do you spray the leafs with anything when the lights are on?

if your plants get burned from the water on the leafs it has a dark brown colour and is very unique.

[drknow1104]

Yeah i have been spraying the leaves with the lights on.:( Better keep it to only at night. I think you are most probably right Harris.

Thanks for the links too.

[MisterE]

I believe it is calcium deficiency. I have a few teensy spots as well on 2 leaves (but not on new growth or oldest growth). I changed to plain ro water of 6.0 ph and 10 ppm and I'm leaving it alone for a few days, then will add some cal-mag plus to my water.

I'd previously been on tap water and have no idea how much calcium was in it.

[Perp]

Check out my sig for the Plant Problem Guide w/ Pics. You will probably find your problem and solution.

[razzapiggy]

I am having a similar problem right now, unfortunately the pictures won't reveal much with this shitty camera. I too believe it is a calcium diff., but I am awaiting advice from others on the board. I also have slight curling of the leaves as you described on a few of the plants, if the nute burn isn't bad will it go away on its own? I only gave them 550 PPM and the plants are like in between 9-12 inches tall, I think they are plenty mature enough to handle that but I could be wrong.