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First grow help diagnosis yellow tips


Whereistoss
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Geraniol
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Hi all, this is my first grow.

Medium coco

Strain pineapple express auto (freebie with purchase and thought practice on this for first run)

Fabric pot started in 2 gallon, transplanted to 5 gallon.

Popped 26 Jan 2021.

Nutrients grow A,B (medtek), Epsom salts, dolomite lime, bloom A,B (Cyco), ryzo fuel (cyco) 

To date have topped after 3 weeks, LST, currently in pre flower stretch week 5.5.

Lights- T5, migro 100+cob

Started under T5 for first 2 weeks 100wt, then to cob at 30% and have raised it over time to 100wt of 119wt Max.

pH water after additives around 5.8 to 6.2, gradually varying up and down.

Nutrients started around .25ec, increasing up to .7 over last 5 weeks. Run off has been below input ec by up to .3ec. Added some dolomite lime to coco and scratched in around week 4 and applied some foliar Epsom salt spray.

In picks it seems like an excess (phosphorus??). I flushed yesterday and applied a .5ec dose of bloom nuts as it seems to be prepping for flower. But am I just making it worse as bloom will have a higher p and k than grow nuts? Other issue is ec out is well below ec in, which would indicate a deficiency based on what I've read on guides here.

Loving all the info available but as a first grow it's difficult to be sure and what to do.

As it's just going into flower shortly I critically don't want to screw up this set up phase.

Any thoughts appreciated.

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Whereistoss
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Geraniol
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Whereistoss
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Geraniol
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Oh and environment, in a 2x2, started with humidifier around 65% for first few weeks and have pulled it and is staying around 60%. Temps around 23-25. 6inch cloudline s6 fan and filter, fan on low setting, small circulating clip fan.

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Toploader
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Linalool
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Have the appearance of the leaves changed in anyway recently?

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Whereistoss
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Geraniol
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@toploader no it's sort of a gradual thing. Prob started 2 weeks ago, so my initial was it's a shortfall as it really started to stretch then.

Only a couple of the top leaves have yellow tips, bottoms all fine and no discolouration. New leaves on tops do look a little thin fingerlike when starting but develop OK. Photos do make it look worse than it is but it still seems odd.

Hoping to narrow down issue. As said out ec is low compared to input. Which is perplexing.

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Toploader
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Linalool
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You might want to just check the underside of the leaves for uninvited guests, just to double check. 

I learned the hard way that spider mites in particular can go undetected, especially in the early stages.

It's probably not, but I don't mind admitting they caught me unawares !

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Whereistoss
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Geraniol
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@toploader thanks will have to check now. Only other symptom is a wet top side of a leaf hear and there. Which shouldn't be as I water to the soil surface not on top of plant. @templegrower mentioned a symptom of one bug looking like someone "spat on your plant". Can't find the recent ep where mentioned. Anyone remember??

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NYCgrower
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Terpinolene
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Hey bud not shure if you used filter but the leaves look kind of light green to me ....also the red stems tells me you need more magnesium

 

the bugs that look like they leave spit are thrips  

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Whereistoss
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Geraniol
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@nycgrower thanks, yeah pic didn't quite show true colour, may be the light washing colour out of image.

Yeah a few stems purplish, main ones OK though. Will tweak a few things and see how we go. They're still zooming along into early flower by end of week so at moment it's not terminal....yet.

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Basssman7
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Ocimene
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The top of a leaf being wet occasionally when the lights first come back on is normal. Plants transpire water as part of the photosynthesis process. That is why good airflow is vital to prevent mildew. It is also why you never want leaves to be touching each other.

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Basssman7
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Ocimene
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How far away from the canopy is your light? The yellow tips may be a sign of light stress if no other signs of deficiency are happening. If the yellow tips are only on the top leaves it would also make sense.

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Whereistoss
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Geraniol
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@basssman7 cheers, yes I had it about 40cm (manual states 35cm) and leaf temps have been at or just below tent temp. I was concerned the cod would laserbeam blast it!

The more I read I'm thinking it may also be an overwatering problem, which looks a bit like a few other issues, like light burn, nutient burn etc. I had been watering once to twice a day with run off. Will let it settle for a day or so and start back with nutrients and see how we go.

Really appreciate all responses, great forum full of info and keen gardener's willing to help.

Hope to report back with a successful first harvest. This really is such a fun new hobby!

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