yellow spots

meluvyoulongtime · Jan 19, 2009

just seen this pop up, can anyone identify what the possible problem is?

4th week in flowering, no nutes yet, just FFOF and water. Temps at 75 with light on and around 50% humidity.

1kooguy · Jan 19, 2009

http://www.weedbay.net/overgrow-thebook/PlantTrouble/Merged.htm

meluvyoulongtime · Jan 19, 2009

I cant seem to find which one I have.......i looked at this site also:

http://www.icmag.com/ic/showthread.php?t=11688

which is the same thing, but I cannot put my finger on it.....any suggestions.

meluvyoulongtime · Jan 20, 2009

anyone else seen this?

dursky · Jan 20, 2009

Yes I have.. if you have not over nuted them then I would suspect your water... I would flush them with distilled water and then keep using it.

Doctor Cannabis · Jan 20, 2009

That's one of two things:

1. Heat burn - take a look at that bulb and the temps again...
2. Mineral deficit (mg, mn, s, fe) - molasses will fix any of these, add 1tbs/gallon every watering.

meluvyoulongtime · Jan 20, 2009

could be the 3 things:

1. I did move the lights a bit closer, but now i will move them up slightly.

2. I use just tap water that has been bubbled with air stone for 24 hrs, i never checked my PH, d'oh!

3. heard molasses works great, will go out and get some. needs to be unsulfered right?

Boneman · Jan 20, 2009

Looks to me like you burnt that one leaf. It doesnt look to be on any other leaves in the pics.

Maybe spilled nutes on that one leaf? Something dripped?

Here is a good post for plant problems. http://www.icmag.com/ic/showthread.php?t=11688

Hope this helps

sandmonkey · Jan 20, 2009

Doctor Cannabis said:
That's one of two things:

2. Mineral deficit (mg, mn, s, fe) - molasses will fix any of these, add 1tbs/gallon every watering.

If, for example, it were a Manganese deficit (not in this case), wouldn't extra Magnesium from the molasses make this worse?

meluvyoulongtime · Jan 20, 2009

I just inspected that one plant and it other leaves are showing signs of this as well. not nearly as bad but visible.

Doctor Cannabis · Jan 20, 2009

sandmonkey said:
If, for example, it were a Manganese deficit (not in this case), wouldn't extra Magnesium from the molasses make this worse?

Molasses has a fair amount of manganese too, so you shouldn't worry about them canceling each other.

meluvyoulongtime said:
could be the 3 things:

1. I did move the lights a bit closer, but now i will move them up slightly.

2. I use just tap water that has been bubbled with air stone for 24 hrs, i never checked my PH, d'oh!

3. heard molasses works great, will go out and get some. needs to be unsulfered right?

Yup, best is unsulphured. If the problem really were water pH, this would have looked very different.

My strongest presumption about this is heat burn.

sandmonkey · Jan 20, 2009

Thanks for the reply, Doc.

It didn't mention Manganese in the nutritional facts of my molasses, but then again you only need trace amounts...

meluvyoulongtime · Jan 21, 2009

ok, i was wrong about humidity, it is low! At 31%, isnt it too low?

Doctor Cannabis · Jan 21, 2009

meluvyoulongtime said:
ok, i was wrong about humidity, it is low! At 31%, isnt it too low?

Ideal humidity for seedlings: 70-90%
for vegging: 40-70%
for flowering: 20-50%

meluvyoulongtime · Jan 21, 2009

oh ok, thanks, then my humidity should be ok.

just got back from wally world and picked up some distilled water. a nice watering is next.

yellow spots

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