Brown spots on seedlings

[Dr. Nuggz]

Hey all,

I am on my first run of coco at day 15 from seed. I noticed some some small brown spots developing on the first serrated leaves. I have pictures but for some reason I can't upload them. Is there a minimum post count to do this?

I have only watered twice since putting them in coco. I have feed once after the spots started showing at 775 ppm and 6 ph but that has not helped and maybe even burned the plants a bit since the leaves started turning down ward.

The leaves are a little pail green as well.

Any ideas?

Thanks!

 

[SeaMaiden]

File or picture size would be my guess. You offer woefully little information for anyone to go on, but right now I'm going to make a rough guess and suggest that they may be wanting for calcium.

 

[ninjagaiden]

yup, sounds like CALMG to me.

 

[Dr. Nuggz]

Hey Ninja and Sea,

Thanks for the feedback.

Last night I flush the plants with plain water balanced to 6ph. I then followed it up with a much milder nute solution (420 hehe ppm). That seemed to take care of the burn problem as the leaves straightened out and the plants look rejuvenated and like thet did some growing last night but the spots are persisting.

Here is some more info
Coco- Botanicare
Nutes- Canna a/b (420ppm last feeding)
Lights- 23w Cfl'sx4 18 inches from plants and separated by a heat shield
Temps- avg 78 degrees
Humidity- @58%
Base water (tap)- ph 9.2 ppm170

I do have cal/mag if you think I should use it. If so do you have a recommendation or are bottle directions cool?

The picture thing is weird because the choose file options on the site are greyed out.

Thanks for your help!

 

[Dr. Nuggz]

Okay,

So I decided to water again tonight and here is what I did in one gallon of water

2 ml each Cana a and b
2 ml rizotonic
3 ml calmag

Then ph'd to 6 and the ppms were at 520.

We will see how that goes.

 

[ninjagaiden]

depends. I run RO water, so i go for 5ml every time minimum. if tap water, 3ml is prob good!

Certain OG/Kush strains do like MORE Calmg. For example, my Tahoe OG's like it at around 7ml per gallon.

I also run Canna AB

 

[SeaMaiden]

Hey Ninja and Sea,

Thanks for the feedback.

Last night I flush the plants with plain water balanced to 6ph. I then followed it up with a much milder nute solution (420 hehe ppm). That seemed to take care of the burn problem as the leaves straightened out and the plants look rejuvenated and like thet did some growing last night but the spots are persisting.

Here is some more info
Coco- Botanicare
Nutes- Canna a/b (420ppm last feeding)
Lights- 23w Cfl'sx4 18 inches from plants and separated by a heat shield
Temps- avg 78 degrees
Humidity- @58%
Base water (tap)- ph 9.2 ppm170

I do have cal/mag if you think I should use it. If so do you have a recommendation or are bottle directions cool?

The picture thing is weird because the choose file options on the site are greyed out.

Thanks for your help!

Holy shit! Is what I've bolded for real? Is that really the pH coming out of the TAP???? That's like Lake Victoria pH! You need to drive that down if the nutrients aren't getting the pH in good range for coco. Good range for feeding in coco is 5.8-6.2.

I've never used Canna nutes, but I do use Botanicare and it needs to be expanded and pre-charged. If you didn't pre-charge it with mild vegging nutrients AND plenty of Ca & Mg, then you're heading uphill and need to seriously up the dosage of Cal-Mag. You don't say which Cal-Mag you use, though. I would start with a foliar application, see if you can stop the spotting (it will never reverse, it's a permanent feature of the plant now, until it drops the affected leaves) at a rate of around 5mls/gal. In fact, that's about the lowest dose I usually go when using a combination Cal-Mag product. When pre-charging, I go with 20mls/gal.

Try resizing your photos to about 1200pixels on the largest side, see if they'll upload once resized. If you need a program and are on a Windows machine, you should already have some photo viewing program installed, but if you can't find it, then just download something like Irfanview or GIMP.

Oh yeah, get rid of the heat shield. It only serves to block light. Add ventilation instead. Also, I personally prefer to save actual flushing with nothing but water for all but the most serious situations, and the very end of the plant's life. It's my opinion and experience that a very mild nutrient solution is actually better, around 300ppm (based on the .5 conversion scale).

 

[Dr. Nuggz]

Okay it looks like things are turning around.

Over the last couple of days the plants have really started to shoot up. Waldo after adding cal mag (Botanicar) last night tonight was the first night the brown spots have not gotten progressively worse.

Also I figured out the picture thing. Apparently the site does not want me to upload picture from my iPhone or iPad. My desk top works though.

The plants are sweetest Cindy 99 from Dutch Grown seeds.

Thanks for all your help.

 

[Dr. Nuggz]

One more thing. Should cal mag be used throughout the grow and every watering?

 

[SeaMaiden]

Damn near throughout the grow, but the last month or so I usually stop giving it for a couple of reasons. First, I want the plant to start using up what's stored in its tissues, second, they just don't seem to need it during the end.

 

[ninjagaiden]

glad things turned around for you! Coco + CALMG is almost mandatory even with tap it seems.

 

[Green lung]

Overwatering................you need a dry cycle for young plants in coco so the roots can establish, your medium is too soggy.

 

[Dr. Nuggz]

[

 

[SeaMaiden]

HUGE difference, WOW!!!

 

[RomulusUSA]

Wow huge difference! Can you explain your dosing for the plants? I am having similar issues and will be giving them their first CalMag dose tonight.

Thanks!

 

[Dr. Nuggz]

Hey Romulus,

I basically just added calmag at 3 ml per gallon with a very light nute solution and did a thorough flushing. I have since moved it up to 5 ml per gallon

I'm no expert though so take my methodology with a grain of salt.

Nuggzzzzz

 

[RomulusUSA]

Cool! One of my IC-friends who does Coco also said to hit them with 3mg/gal and see how that goes. I did a thorough flush (2cup/plant of PH'd tap water) and then dosed with full strength nutes (Heads 6/9) plus 3mg/gal of CalMag.

Good to see that your plant turned around so nicely! I'm lookin forward to see it flowed out!

 

[RomulusUSA]

Duplicate post.. My bad.