Sick plant?

[Blartspud]

Could someone identify the problem here? Leaves are all yellow with burned tips. Bit late in the day now to fix I suspect, but would still appreciate some input. If only so I know what to look for during my 2nd grow.

Medium: canna terra Pro plus.
Canna nutes.
Watering every 2/4 days until I see a little runoff. No nutes at present because it's nearing harvest.
Strain: think different.
Light: viparspectra 300w.
Temp: constant 26°c.
Ph: 6.
Age: 74 days

Super worried it's gonna die before I can harvest.

 

[KonopCh]

How trichs look?

 

[Rev. Green Genes]

The good news is, she is very close to harvest and looks beautiful. I have a thing for the fall colors you got there. I think it looks like normal leaf senescence. If you are worried about defficiency you can add a finisher additive, or try a foliar spray. Judging by pistils though, you might can harvest her next week. I'd leave it alone, or even defoliate it.

But for everyone peace of mind, at that late stage of flower, please check for mold. Whenever I see leaves falling out of buds, I get scared of the dreaded mold.

 

[Arthur]

Hard to see much from your pics, led isn't good for diagnosis. Need shots under normal lighting...that being said, pH is low for end of flower, and you specified canna nutes, what about cal/mag? I suspect magnesium dif, the necrosis seems to have that appearance, again without regular lighting...

I think your right about it being to close, if you've already backed off the nutes, and gone to straight water, I assume your within a week of cutting, so not a lot to be done.

 

[Padawan1972]

Hard to see much from your pics, led isn't good for diagnosis. Need shots under normal lighting...that being said, pH is low for end of flower, and you specified canna nutes, what about cal/mag? I suspect magnesium dif, the necrosis seems to have that appearance, again without regular lighting...

I think your right about it being to close, if you've already backed off the nutes, and gone to straight water, I assume your within a week of cutting, so not a lot to be done.

Sound advise from @Arthur . I would defoliate and go over the plant inch by inch. as stated your PH is a slighty low, I run 6.2-6.5 in my soil , so it could be causing possible lock out , We mentioned getting a loupe to check trichs. Shes close, but its going to depend on how you want your finish product if the plant is just going through its final stages.

 

[Ledist]

You must find good ratio of how far are lights and how long on/off time vs. nutes to bring in. Day 74, hah. Im in day 72' i think some strains yellowing is on the way that stage ,optimal good condition time for average autos are 90+ days.

 

[Blartspud]

Took some more pics with the LED off. I did order a digital microscope, but unfortunately it arrived damaged. :/

These are the best pics I can manage, lol.


So, any thoughts?

 

[Waira]

-- mostly late P defc. mate, nothing to do at this point,... the fans did their job coughing up the extra P to support the buds, which are nice- .... mild nutes are okay, just to keep the K up, as this plays a big role in aromatics too,... you cna quit nutes totally for a few days prior to harvest if you like,... with fans this tapped, you don't have any worries about excess stores in there!
harvest time will depend mostly on what the trich's generally all over the buds tell you,... clear = immature (always going to be some around, on the newest bracts with white pistils still)... cloudy = ripe... amber = past prime for THC, starting THC breakdown into CBN, a narco-sleepy cannabinoid,... how much of that is a personal call depending on preferences, and the nature of the buzz the strain is known for,... generally, 10-20% amber is a common choice,.. on rare occasion, some plants don't amber much, or don't until well past prime for aromatics, so let you nose do some talking too,...