need help finding out what nute deficiency i have asap

need help diagnosing deficiency asap
Hi I have got some sort of difficancy and I need help with a diagnosis if that is possible, I am growing growing blueberry in coco and I'm 5 weeks into flower

I feeding canna A & B, canna boost and just started using PK 13/14 yesterday. pH 5.8

About two maby three weeks ago
I started to see rust patches in the centre of what looked like perfectly healthy leaves and it has steadily got worse, i now cave two plants that are looking really rough and the others are now starting to show little rust patches and im getting worried.

i was thinking it might be a magnesium or phosphorus problem but im not sure, any advice would be greatly apprecated.

Attachment 296001Attachment 296002Attachment 296003Attachment 296004

If your ferts say they have mg and phosphorus, then it's probably something else. If the rusting starts off as small golden-yellow spotting, then it's probably magnesium def and you can probably add a small amount of Epsom salts to your fert mix or just put about 1/4 to 1/2 teaspoon in a gallon of water and give that separately. I've seen this kind of spotting before, however, and it was thought to be calcium def. It's hard to know unless you're absolutely positive and and not too many people really know what the spotting is telling them. Perhaps the best bet would be to get some calmag and give that according to the directions on the container and see what happens. The brown tissue is dead and won't come back but with calmag you cover two things at once, so if the problem is just of them for certain, then you given the right thing and it's unlikely that more of the other will do any harm. It's interesting that people give ferts that may not have everything you need. The grower needs to know's what necessary for plant nutrition and provide it, especially in coco or hydro grows.

Show us a close up of the bottom of the affected fans
That first picture looks like Thripp damage.
If you see tiny, black, spheres, whip out your Loupe and look closer.

Might not be a deficiency.

Aloha,
Weezard

first of all i like to thank you guys for taking the time to help me

ive just checked my nutes and it contains mg and cal so im at a loss there maby over feeding, what do you think?


and ive just checked my runoff and ive found thrip larvy! could that cause the brown burned looking leafs? i found nothing on the underside of the leaves

ive uploaded some new photos so maby you guys can take a look for me, and again thankyou for your help i really apprecate itAttachment 296012Attachment 296013Attachment 296014Attachment 296015Attachment 296016Attachment 296017Attachment 296018

Attachment 296019Attachment 296020Attachment 296021Attachment 296022Attachment 296023Attachment 296024Attachment 296025

Good pics!

You will get better help if you fill out the troubleshooter's form.

http://boards.cannabis.com/plant-pro...anted-one.html

I'm not much of a grower, but I'll take a shot while we wait for one.

Looks like you have multiple problems here.
The first pic is definitely thrip damage, and yes when they bite through a leaf vein the rest of the leaf downstream dies.
You will find that the Thrips scoop out divots in the leaves, and that abets viral and bacterial infections as well.

I'm also going to guess that the PH has been/is low from the red petioles on those fans.
When was the last time you transplanted to a bigger pot?
When roots get crowded in coco the chemistry becomes unstable.

From watching my DWC grows, I learned that the roots will keep growing all through flowering, right 'til the end.
When growing in coco, I always up-pot when I flip.
Then at 4 weeks in, I "stack the" container for a little boost to fatten the buds with.

In your shoes, I'd fill a container with fresh, ferted, PH'ed, cal-magged, coco, cut the bottom off of the present container, and stack it.
The damaged fans won't get better of course, but the new growth will have a fighting chance.

As for the "Thrip larvae" in the runoff.
Is that a positive ID?
Thrips have 2 larval states and a flyer state.
The flyers bite.

Fungus gnat larvae are similar but the "flyers" are bigger and do not bite.
I don't know much about pest control, so once you have a positive ID, search the archives here for solutions.

Fill out and post the TF sticky and let's see what P.P. and the rest of the group makes of it.

Aloha,
Wee zard

firstly i would like to thank you all for all your help, i decided the flush them for the last three days to expel any build up in salts then im gunna let them dry out as they are socking! and then i will feed them at half strength and see how they go on, one thing i forgot to tell you guys is the leaves are only going brown from halfway up the plant and not from the bottom, dose that help with a diagnosis at all?


anyway i do appreciate you guys taking the time to help me with my problem, and i just thought i would say thanks!!!

plants look like they are finishing up their life cycle. They will be ready to harvest soon. I wouldn't add nutrients now.