Rusty Spots Startting from Serrated Leaf Edges

[Beerhunter CDN]

Problem: Rusty Spots started from leaf edges and spreading in between veins.

Medium/grow method:
Canna Coco Coir w/ 35% perlite

Feed: and supplements used: Mega Crop 4.0g/G , Greenleaf Calmag 1.5g/G, Greenleaf Sweet Candy 1g/G, and Greenleaf Bud Explosion 1g/G
Hydrogen Peroxide also added (diluted 10:1, then 4ml/G to help keep reservoir from growing slime)

PH adjusted to 6.0 after everything is added.

water source: RO

Strain/age: Seedsman Auto Blue Day 43
Problem noticed about 1 week ago.

light used: 3500K Autocob at 60cm

Climate: 26C @68% RH

Additional info: Growing in a Solo Cup and using an automated dripper system to feed every 8 hours currently. Affecting all leaves as time goes on but mostly mid fan leaves are the worst. I thought it could have been excess nutes built up by the dripper not dripping for enough runoff so I mixed a weaker version of nutes and watered by hand to flush and reset the coco.

@namvet25 @Waira @Mañ'O'Green

 

[namvet25]

If your feed dosage is per gallon you might want to raise you cal/mag dose a little higher.

 

[AutoWonders]

It is imperative to have some calmag on hand when growing with led lights.

 

[LazyNhazy]

I think calcium spots leaves and mag makes leaves look striped. But far from a pro, looks like phosphorus or other. What's @Waira think because I got one like this and ph was drifting from too much calmag.

 

[Simplicio]

I believe you are overfeeding.
Supplements can do harm by adding to overfeeding.

Downward clawing too-green leaves with orange edges are classic signs.
I'm not a solid medium grower, but in hydro your ppm would fry my plants.

When in doubt reduce light and feed.

 

[Arthur]

Looks like Phosphorus to me, it can be sneaky and mask as other deficiencies. The leaf margins are what's pointing me to P... I've usually seen it appear mid flower as a definitive P, but have noticed other signs earlier.

 

[Mañ'O'Green]

Problem: Rusty Spots started from leaf edges and spreading in between veins.

Medium/grow method:
Canna Coco Coir w/ 35% perlite

Feed: and supplements used: Mega Crop 4.0g/G , Greenleaf Calmag 1.5g/G, Greenleaf Sweet Candy 1g/G, and Greenleaf Bud Explosion 1g/G
Hydrogen Peroxide also added (diluted 10:1, then 4ml/G to help keep reservoir from growing slime)

PH adjusted to 6.0 after everything is added.

water source: RO

Strain/age: Seedsman Auto Blue Day 43
Problem noticed about 1 week ago.

light used: 3500K Autocob at 60cm

Climate: 26C @68% RH

Additional info: Growing in a Solo Cup and using an automated dripper system to feed every 8 hours currently. Affecting all leaves as time goes on but mostly mid fan leaves are the worst. I thought it could have been excess nutes built up by the dripper not dripping for enough runoff so I mixed a weaker version of nutes and watered by hand to flush and reset the coco.

View attachment 1092999 View attachment 1092998 View attachment 1092997 View attachment 1093000

@namvet25 @Waira @Mañ'O'Green

I am thinking P deficiency and maybe a little Cal-Mag.

 

[Beerhunter CDN]

Thank you all for the quick response. I suspected Calmag but I had only ever seen it all over the leaf when it started, not the leaf edges and working inwards.

@AutoWonders I precharged the coco with nutes and Calmag from the start and I feed Calmag with every feeding.

I had the dripper system running for 10 days while I was away but I don’t think it was watering enough to get a good runoff. I’m thinking it could have locked out Phosphorus in that time from a buildup of nutes. I gave her a flush with weak nutes with Calmag. Tonight I’ll begin increasing nutes again and see how she goes if she is lacking P now.
I had no expectations of this plant as it was a freebie seed being used as a test for the Solo cup Comp. Now, I actually like the plant and I’d like to see it through to harvest. I’d rather not have deficiencies but they are a good learning tool.

Thanks again

 

[Arthur]

Progression of a P deficiency.

 

[JS550Fan]

Thanks for that last pic. I've got an apparent deficiency I'm trying to identify. My plant is pretty tall, 2 weeks into flower, may be borderline N toxic, and is starting to get yellowing on lower fan leaves, mostly. I haven't fed with any calmag yet, so I'm doing that tonight, along with a foliar application. But I also think it might be P deficiency. It's my own living soil mix.