Need help diagnosing leaves...(pics)

[joe fresh]

hey guys just need a little help diagnosing this little prob


first few pix are the early stages and the last pic is the later stages of whatever is going on.

EC: 1.8
PH: 6.3
medium: promix hp


only happening on the older fan leaves of about 15 plants out of 140

 

[joe fresh]

anyone have any opinions?

 

[joe fresh]

heres a few more pics, the leaves look like they have diff symptoms but i feel like its all related to the same problem

 

[2Lazy]

The stage in flowering plus the purple stems combined with the high EC and eventual necrosis indicates to me a magnesium and phosphorus salt lock up. I am not saying I'm right, and without more info on your nutrients or water source I cannot offer much more help. Sorry no one else has chimed in, I at least wanted to say something.

If you've recently begun using a new blooming product that's probably the source of the issues. I also want to show some concern with the pH, and wonder if you included any dolomite lime into your mix to help condition and buffer the soil as peat is historically acidic. Check your run off pH to make sure everything is in line.

 

[richyrich]

It's calmag deficiency. The rust spots are calcium and the yellowing is magnesium. You also have phosphorous deficiency on the really nasty shriveling leaves. Otherwise your plants look good. One of two things. Up that ph to 6.5 and/or add some TechnaFlora MagiCal at half dose 5ML per gallon. Your problem is not too bad right now. Good luck. . .

 

[joe fresh]

thx very much, i was figuring maybe a P def, and was suspecting i needed some cal/mg, but the reasurance is always nice . thx ricky, very much

i just baught some cal/mg and i think i will up my EC to 2.0 and see what happens

 

[jammie]

yea- everybody talks upping p/k in flowering and they forget that mj also uses lots of cal/mag in flowering and its easy to get lockout if not monitoring ph

 

[Core]

its notthing....down the road there will be more where that came from ....plant looks great imo! just back down on the nutes a wee bit..maybe incorporate a plain watering from time too time.....coz she's looks quite dark green to blueisch....that means she has alot to eat

 

[joe fresh]

heres a few more pics, just hoping that i got it covered but any more opinions would be great

 

[joe fresh]

heres a few more

 

[joe fresh]

just thaught id mention that im in soil, and water 2-3 times a week, always fert on wednsday, then plain water till next fert

 

[darwinsbulldog]

yeah if you're giving them heaps of nutes the only possible issue i think could be the ph being too low and locking out certain nutes. as richy rich said probs bring the ph up a bit (soil's good at 6.5-6.8 i believe) and see if the leaves with minimal discolouration turn darker green again, that'll be a sign that you've sorted the issue out, really damaged leaves won't recover so just cut them off.

 

[darwinsbulldog]

ps. wow that leaf that's sick as a dog in the top post on the right has 11 fingers! nice work must've been doing something right to be getting 11s before this happened

 

[joe fresh]

well, i have been watering at 6.3 ph as AN recomends i do so with a peat based medium, but yesterday i watered at 6.6 ph with only calmag and potassium silicate, and for a little bit i think ill water at 6.6 ph to see if i cant get them to absorb a bit more nutes with a wider ph range

 

[DANK_BOTANIST]

yea man ive seen very similar problems lately in my vegging plants now after dropping down to 6.1-6.3 area so now i go back to 6.5ish after reading this info.. thanks to all.

 

[joe fresh]

heres a few more pics, its looking more and more like my plants are starved, but i dont want to over fert them,.


what do you guys think i should do?

 

[joe fresh]

heres a few more pics

 

[joe fresh]

a couple more

 

[mas9779]

low iron

 

[joe fresh]

i dont think its iron, iron would show at the tips of new growth, the new growth looks fine