What wrong with my plant? very yellow brittle leaves one week before h

[lightsout]

Hey guys,

I think my girls are about 1 week from harvest (this is my first crop).

 

I have two plants in a run to waste system (their some afghan strain)

growing in coco/perlite approx 50/50

Under a 600w HPS

They get watered for 4 minutes every 2 hours the light is on

Used Canna Vega/Flores A+B through out and PK for a week a few weeks ago

 

I had scarid flies, wouldnt say an infestation just half a dozen or so visible adults at any one time (god knows what was happening under the surface though).

I put up with them for a while but then started to notice some yellowing of some of the leaves and thought it might be an inability of my roots to uptake nutes due to them being munched by scarid larvae. So i gave em scarid fly drench which seemed to work (no more adult flies). After this I gave them rhizotonic to help the roots recover, but some of the leaves still look very sick.

 

I am now on my final flush (about 5 days in) and a lot of the leaves are so brittle they crack and crumble when you touch them. The buds seem fine to me but this is my first grow so I could be missing something. It seems to only be the leaves toward the top of the plant. could the light be too close? or did i fail to wipe out the larvae? or...?

 

anyway pics attached

 

cheers

[Wrangler556]

High temps and low humidity be my guess?

 

The yellowing happens when you flush, jus the plant taking whats stored in the leaves.

[psychoresin]

i think you shoulde raise your ec or lower it to one point eight . during the final bud

[jimbojones5678]

If you have only one week to go then there is nothing you can do - the plant won't have the necessary time to do any major repairs so just look after it as well as you can and take the lesson with you for your next grow.

 

Jimbo

[lightsout]

All my meters say temp/humidity are good (27deg/~55% with lights on) and my fans on a thermostat,

 

I had my ec at 2.4 (i use rain water) right up until i started to flush. roughly how many weeks would you class as final bud? might try drop it next time.

 

A lot of the leaves are curled upwards as well. Theres lots of healthy looking green leaves on lower branches, which is why i thought the top ones might be to close to the light.

 

 

"The yellowing happens when you flush, jus the plant taking whats stored in the leaves. "

 

That makes me feel much better about the recent worsening of the situation. Cheers!

 

Hopefully keeping the flies out and maybe droppin the EC, as psychoresin said, next time will keep em nice and green

[SeaHiPPieS]

In Cannaversity

Cannabis Grow FAQ

great pix of plant illness

and reference to diagnose

Wort a big look

Cheers

SpOoK