Help with diagnoses please

Hi peeps, just wondering if you all could take a look at the pic i posted. Thinking it may be cal deficient but want to be sure.Sorry, i forgot to say it's DWC and plant are 2.5 weeks old.7 out of 8 plants are the same started at bottom leaves and moving up to new growth. Plants are still growing apart from this.Thanks for any help

Help these folks help you! The more info you give up front, the better these experienced growers can decipher what's going on.

What's your grow environment like? Nutes? Medium? Light? Water/feed schedule? ph?

Can you post a pic of the whole plant?

It looks like a Cal def to me but I'm far from an expert.

are you already feeding calcium? and magnesium? other issues?

Hard to tell with out better photos but it looks LIKE a cal Def to me, if all plants are getting the same problem and your running dwc i would flush the whole system with drip clean just to get rid of any build up you may have in lines or your rez

What is causing this ? And how can I fix it ? Thanks in advance... They do fine and then all of the sudden they start dying. I'm lost

looks like calcium deficiency... if ur running distilled water and less than 140-150 ppm chances are your lacking dissolved calcium..

also check ur ph if it's outside of 6.1-6.5

LeePonic said:

What is causing this ? And how can I fix it ? Thanks in advance... They do fine and then all of the sudden they start dying. I'm lost

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your plant looks like it needs a micro mix compound (zinc, manganese, and iron)

Sorry, i forgot to say it's DWC and plant are 2.5 weeks old.7 out of 8 plants are the same started at bottom leaves and moving up to new growth. Plants are still growing apart from this.Temps are good but had three day consistant with 3 days of slightly high humidy.1/4 strenght nutes.

More pics and thx

since you refuse to tell us what you feed them,

I'd say you're plant is exactly 1/4 as healthy as it could be, might be a clue there

O, sorry yes General hydroponics trio at 1/4 strength.

Yep the Ph has been fluctuating between 5.7 and 6.2 and 450 PPm's i also have the HPS lights set at 400 watts until i sort this issue out to eliminate heat stress.Air temp 75 to 80 degrees. Thankyou

Have you checked them for bugs? Thirps cause similar looking damage. The sporadic white dots are an indicator. Some leaves will be effected others remain unharmed. They don't really slow the plant down. Makes it look like hell, though.

I'd offer the advice of taking a jewellers loupe and inspecting under the damaged leaves. Inspect the stem also. Rule out bugs before messing around the nutrients.

Hi SouthCross, I will check for bugs in the morning but yes i found some black dots in the midle of some of the sporatic whitey/yellow dots.I'll ket you know tommorow if i find anything else but yes i think your right on the money ,Thx Mate!

I'm going to flush them for a few days and them feed less and see had that goes amd will let you's know cheers