SOS rusty leafs on my new chronic

[neville hz]

Hi all

Please help me diagnose and correct a problem I have with my female chronics from serious seeds.

In the last few days my leafs on all but 3 plants have leafs turning very sick looking. They have a yellow/brown rusty burn like look to them.

FYI

They are in a aeroponic propagator.
Light is 400 mh and definately not close enough to burn them.
The room temp is between 18 and 27.
The water temp is between 18 and 22.
I'm using Canna aqua vega nutes and h2o2.
My pH is between 5.6 and 6.2.
EC is 1.3 and hasn't been higher than this.

Therefore I can't see why this is happening.
Any advice or guidance would be greatly appreciated.

 

[watts]

Looks like calcium deficiency or lockout to me.

 

[neville hz]

Could be a problem with Canna nutes then? As th pH is always within the right range.

 

[Hold Your Fire]

Chronic is a cal/mag hog.

Nute hog in general.

I'm in pro mix tho' , not sure how much help my advice is.

 

[neville hz]

Hi HYF

So should I increase my EC with more veg nutes to give them more mag?

Not sure if I should be flushing or giving something else or.... ��

 

[al70]

Calcium Deficiency


--------------------------------------------------------------------------------




by Nebula Haze & Sirius Fourside

This marijuana leaf is showing signs of a calcium deficiencyProblem: Calcium is an important nutrient which helps provide structure to the cannabis plant and helps it withstand stress like from heat.

A cannabis calcium deficiency can sometimes be difficult to diagnose since calcium deficiencies are often accompanied by magnesium, iron, and/or other deficiencies.

Calcium moves relatively slowly through the plant (it is a semi-mobile nutrient), and tends to remain concentrated in older growth. Calcium deficiencies tend to show up in newer growth (upper leaves).

Picture of a calcium deficiency on a cannabis leaf - white background so you can clearly see the brown spots - calcium deficiencies appear on the upper leaves (new growth)

Calcium Deficiencies Appear Near Top of Plant

 

[Claude]

Hi,

It could well be a magnesium deficiency as it look like the lower leaves and that the necrose is between the veins and not at the leaves extremity.

What humidity you have in the room as low humidity will reduce the calcium intake.

Do you have sudden change of temperature?

If you put H2o2 at the same time as your fertiliser it will change the molecules polarity, meaning that intake is well reduce.
Always use H2o2 alone and wait a full day before adding fertiliser.

Respect
Claude

 

[neville hz]

Hi

Thanks for the help.

So maybe this is caused by the h2o2 being added at the same time as the nutrients.
No sudden change of temps.
My humidity is quite low unfortunately - around 36%.

 

[PoopyTeaBags]

put your food down to 400ppm or lower.... 99% positive its nute burn.... hard case thats why u dont got burnt tips...

 

[Sativa Dragon]

Looks like a Mag deficiency to me as well, I wouldn't add more nutes, Leave the H202 till flower time.

If you are using RO water ensure you are using Cal/Mag

Peace

 

[PoopyTeaBags]

its not calcuim def 100% and im 99% sure its not mag def....

Guys hes in a aero cloner or machine... constant spray of nuts at 650ppm with clones... how the hell do u guys figure he is defficient.... I have ran 6foot tall plants in dwc at 400ppm without ever going deficient in anything with RO water an just a base nute... plants dont need all this food we shove down there throats... feeding more of something that it is not will just end up locking something else out....


Feed less grow better weed.

 

[dansbuds]

you don't mention your water source .... Canna nutes are formulated for Tap water . if your using RO your going to need CalMag . but it looks like lockout from the PH being out of whack . do you check your PH often ? it needs to swing from 5.6 to 6.0 for all the nutrient to be taken in as needed .

& yes 650 is to much in hydro for plants that small ..... drop it to 400 or less .

 

[Sativa Dragon]

Good Point

I have never used an aero cloner, but I have had a Mag def, anyhow I have heard of people with problems with disease in the aero cloner, maybe there is and issue with the aero cloner.

Peace

 

[neville hz]

Thanks for all the replies everyone.

To add -

I use tap water (hard water)
I check the pH several times a day.

Can anyone add to what Claude from serious seeds has said about adding h2o2 separately to nutrients? Reason I've chosen to use h2o2 was due to past stem rot issues so this is to keep that bl00dy pathogens at bay...however I'm happy to wave it goodbye if it's not helping.

I always thought 650ppm ish was ok at this stage but as you advise I will refill the cloner with a weaker mix...and with just the canna aqua veg.

One last note - they're from seed but I use the aero cloner for more vigorous root growth.

 

[Sativa Dragon]

Giver

Peace

 

[Claude]

Thanks for all the replies everyone.

To add -

I use tap water (hard water)
I check the pH several times a day.

Can anyone add to what Claude from serious seeds has said about adding h2o2 separately to nutrients? Reason I've chosen to use h2o2 was due to past stem rot issues so this is to keep that bl00dy pathogens at bay...however I'm happy to wave it goodbye if it's not helping.

I always thought 650ppm ish was ok at this stage but as you advise I will refill the cloner with a weaker mix...and with just the canna aqua veg.

One last note - they're from seed but I use the aero cloner for more vigorous root growth.

In what kind of medium did you start the seeds in??

If it is Jiffy's you will have root Roth as it keep the starting roots in water and should have more air go through.

Respect
Claude

PS: Jiffy are not for hydroponic.
PS2: H2o2 info : http://www.jasons-indoor-guide-to-organic-and-hydroponics-gardening.com/using-hydrogen-peroxide.html

 

[neville hz]

Hi Claude

I start them in 1" rockwool cubes in a standard heated propagator and transfer them to the aero propagator as soon as they root through.

 

[Claude]

That is good.

Now did you PH'ed and stabilise the rockwool at 5 PH before using it??

Respect
Claude

 

[neville hz]

Yep - but at 5.8 rather than 5 and with a root booster.

 

[Claude]

The only thing I can say is that there is something blocking magnesium intake.
Could well be your humidity which is to low now.
But before use the H2o2 method I refer you.

Respect
Claude