Rust spot on seedling leaf?

[justice8965]

Hey all. Growing in coco, seedling is less than a week old. In EC is around 450, PH 6.2-6.3 In a solo cup. Out EC is 550ish. Daily fertigation. Calmag and light nutrients, plus rhizo. Under CFL bulbs.

One plant has this rust/orange spot on the leaf. The others don't. Any idea what this could be?

 

[growsince79]

quit spraying it

 

[justice8965]

I actually just did that with some calmag water, thinking it was a calcium deficiency, but I won't again. Does it look like calcium def to you?

 

[growsince79]

Even when I used to run hydro, I never saw any deficiencies in seedlings. I don't do coco just cocoloco. big difference.

 

[BabyFarmer]

I actually just did that with some calmag water, thinking it was a calcium deficiency, but I won't again. Does it look like calcium def to you?

This rust just showed on my, 5 wk...

...and I've never sprayed her.

Just fed her the first time this morn. I was wondering a out cal/mag deficiencies too.

 

[justice8965]

Hmm I did flush this coco that's in the cup before I put the seedling in there, probably diluted the calmag water I used to flush too much. I'll give her some extra calmag for the next couple days

 

[justice8965]

BabyFarmer, I'm a first time grower and certainly no expert, but based on all the pics I've been looking at for the past hour, that's almost definitely calcium deficiency.

 

[growsince79]

Sometimes overwatering will cause lockouts.

 

[growsince79]

This rust just showed on my, 5 wk...

...and I've never sprayed her.View attachment 1009308View attachment 1009309View attachment 1009310

Just fed her the first time this morn. I was wondering a out cal/mag deficiencies too.

If that was mine, I'd transplant to a larger full pot.

 

[BabyFarmer]

That's in the works as well, gonna go up to a 7gal and fill it to top like... was a rookie error, but it may work out to give her some fresh rich soil. I don't feel she is growing fast, but if I can dial her in before cutting the lights she could be a solid first plant.

 

[BabyFarmer]

BabyFarmer, I'm a first time grower and certainly no expert, but based on all the pics I've been looking at for the past hour, that's almost definitely calcium deficiency.

It's what I was thinking...

I like that I let her go until she started "telling me". Seeing it happen is so much more educational than blindly preventing it because somebody said so... lol

I actually almost order and started cal/mag last week... but everyone says to wait until they tell you what they want before making a change.

 

[Beachwalker]

Even when I used to run hydro, I never saw any deficiencies in seedlings.

+1 Never

Edit: drop your pH a little 5.9 - 6.0 for best results good luck

 

[justice8965]

+1 Never

Edit: drop your pH a little 5.9 - 6.0 for best results good luck

Will do, thanks!