ive got 9 SS white ice hand fed in canna coco soil.
with canna coco A+B.
they're 4 weeks from seed,
all are looking healthy apart from one of them the new growth is coming through yellow
i started feeding last week with 15ml A + B to 5l water with EC of 1.6 (water was 0.6).
then i upped it to 1.9 EC overall for the last feed (PH around 6 *dropper test)
ive had to stagger feed them all to get a good wet / dry cycle going
temps 27.5c lights on - 19c lights off
humidity around 70%
not sure if its lockout due to bad PH but im sure someone can shed some light
Click to view attachment

more picsClick to view attachment

the restClick to view attachment

Hi,i have 4 plants in pots,3 of whitch are 5 weeks into flowering.All show signs of yellowing.Think i may have over-waterd them.

anyone ?

It's an (Fe) Iron deficiency. Have a look at this thread.

Probably caused due to low lights off temps at the root zone. If you lights off temps are as low as 19, then the root zone will be colder. Cold temps inhibit the uptake of micro elements, in your case (Fe). Though it's strange that only the one plant is showing symptoms. Maybe that plant is just the problem. If the others start to show signs, then you definitely need to address your temps.

thanks bish, this doesnt sound good, what i cant understand is this is my 2nd grow in this space and the last one went swimmingly - no problems at all and it was the same time of year and this time i have lined the floor and walls with insulation so its slightly warmer this time round
i do have an inlet pipe coming from the window down to floor level which is the same side as this plant was on so it does make sense, ill try moving it tonight
also are there any additives for iron like epsom for Mg

That's your problem.

Maxicrop + Fe for Iron deficiencies. Use it as a foliar application (2-3ml per litre water)

I was having a few temp probs when the cold weather 1st hit, the temps at the canopy level were sitting at bang on 20C lights off but the root zone was a bit low at 16-17c but all i did was direct the inlet up a bit so it was basically aimed right at my circulating fans and the rootzone temps are now sitting at 20-21c and the temp above the canopy is staying at 20c also.

thanks guys
dont you hate it when you find out what needs doing and your light doesnt come on for another 5 hours

ive 9 SS white ice
5 weeks from seed
600w MH - 80cm away
18/6
very good ventilation
temps 20 - 28c
root riot cubes in canna coco soil
canna coco nutes A+B 30ml to 10litres (1.9 EC, 5.5 - 6 PH)

ive maintained an equal feeding regime will all of them giving good wet / dry cyles
this one was looking a little more wilted than the rest yesterday
i thought it might have been because it was coming to the end of the 18 hours light
but today spotted theseClick to view attachmenton just one of the plants
that is on one side and there is just a single rusty looking spot on the opposite leaf
pic to follow

Click to view attachment
is it fungal, and if so do i need to ditch it as soon as ?
cheers

i dont know about the leaves but my plants are fifteen days old from seed an look the same as your first pic an thats under a 250 cfl... maybe im seeing it wrong but you may need to move light closer especially now theyre not tiny anymore, talk to people about it on here...

anyone?

hi

got something similar myself bud in coco with ionics nutes put it down to maybe over watering and/or low humidity

probably wrong though

peppi

im pretty sure its not overwatered and ive got an ultrasonic water fogger keeping my humidity around the 70 - 80% mark
ive decided to nip the two offending leaves off and keep my eye on it for the next couple of days
if it cops up again ill just get rid
i'm surprised ive not had an answer yet though WAKEY WAKEY UK420 !!

"yawn" sorry, sleepin there matey. dont delay, treat today!! pm webby, get some essence and treat, dont delete them rusty plants. its treatable mate, and if it is fungal, then its in the air, tiny spores innit. you'll spend the rest of the grow worrying and it quite possibly will come about, so get the essence, and follow pro libertate's method, prevention is the key, best to do it now, i waited till 2 weeks in flower and with very few fan leaves left before getting the essence, tried other ways first but ur best bet is be prepared..... and who's to say that little plants feelings are now terribly hurt, all that talk of getting rid. bit of sweet talk, make sure it knows u love it as much as the others and regular treatments with essence brew should keep fungal problems at bay. alot of it about this time of year, covers the trees and bushes. if its something other than fungal, ignore all i just said as bollox.



good luck either way matey!

i'd move ur light a little closer too mate, trial and error but a couple of feet (60cm) should be more suitable. keep an eye though, but they look reasonably devweloped so should be ok. still a newbie so ignore my late night ramblings, its only what i copy from clever folk anyway. 5 weeks, what size pots are they in??? could it be that there in need of potting up and the necrotic patches are due to being root bound?? i dont know, but atleast your adressing the issue by posting about it, your on the right track already! i'm sure those clever types will be along soon. nighty night

<threads merged>

bish why have you merged the threads ?
these are 2 different problems on two different plants
are the yellowing new growth and brown spots both caused by Fe deficiency?
it looks more fungal to me

They're all in the same room, & same var right?

yeah mate. same room, same conditions, same feed , same regime.. cant understand it at all

I'd just see how they go for now, as it doesn't look fungal.

In the one pic where the leaf is touching the pot lip, that doesn't look fungal. But more to do with that leaf remaining damp, or remaining damp due to watering. What are your root zone temps?


And don't worry too much - but you may want to mist them with a fungal preventative anyway

thanks bish
ive nipped the 2 leaves off now so ill just keep an eye out for anything else. i'm thinking i'm probably gonna have to ditch a few as they get bigger
(is 9 plants under one 600w too many)
i did 6 last time and they were fighting for space but i did veg them faaaar too long

Not at all.

what is the ideal EC for the canna coco nutes?
ive just mixed some to the instuctions (40ml to 10lt)
and i get a reading of 2.5
my waters showing as 0.6 so it would be 1.9 , or does it not work like that