Small Brown Spots Showing up on Fan leaves...What r they

[HeadyPete]

Sorry, I have a 600 hps and have sprayed my plants and never developed "water spots" Your magnifying glass theory sounds good but a hps is not strong enough to burn a plant leave. The sun, maybe....

If this were the case, there would be much more damage than these couple tiny spots, as OP sprayed the plants many times.

I would like to see you recreate this water spot phenomena and show us some pix.

I say it is urban legend, like so much of the info swirling around here.....

 

[SpoCannabis]

Sorry, I have a 600 hps and have sprayed my plants and never developed "water spots" Your magnifying glass theory sounds good but a hps is not strong enough to burn a plant leave. The sun, maybe....

If this were the case, there would be much more damage than these couple tiny spots, as OP sprayed the plants many times.

I would like to see you recreate this water spot phenomena and show us some pix.

I say it is urban legend, like so much of the info swirling around here.....

Lol, its not my theory, it is a fact. Look it up...

 

[HeadyPete]

where? it's a theory without proof.

 

[Chunkybuddha]

Don't want to hijack this thread, but thought since you're all being so helpful I'd drop in a picture for diagnosis:

What's the dealio? Any ideas ppl?​

Hey brother, just wanted to say my plants looked like that for the longest time and I just couldn't figure it out! Finally I transplanted them using the same everything but into a larger container. All the new growth was green and healthy so I just ruled it as root-bound. Anyway, it might be different in your situation.

 

[SpoCannabis]

http://archive.globe.gov/fsl/elementaryglobe/docs/MagnifyThat_17May06.pdf

http://www.ehow.com/how-does_4567687_water-affect-grass-growth.html

http://60secondscience.org/activities/LittleDropsofWater.html

http://www.lscgate.lsc.org/assets/docs/LSC Unit1 Lesson3.pdf


Hmmm........ and that only took about 5 seconds...

 

[HeadyPete]

5 seconds that you wasted. Nothing there proves that a hps will burn a leaf through a water drop.

The one link that might come close deals with the sun, not artificial light.

Talk to me when you can show some proof.

 

[TGT]

Ya, stop spraying and use lesss nutes - problem will dissapear.

TGT

 

[Maxyeild]

I have them in a soil be so I know that is not it. I just hit them with 2 plain RO watering and it seems to have gotten a bit worse. I think they need to eat!!

 

[Anima]

When you say 1300 PPM you need to state what PPM scale you are using:

EC is supposed to be the universal measurement.
Just FYI.

Usually little brown spots has to do with a calcium problem...
and access's pic looks like he has a cal/mg prob....possibly caused by pH lockout if those elements are present and not being absorbed.

Just my thoughts...