Can you diagnose this problem?

[Jordog05]

Hi all, thanks for reading. My plants are roughly 4 weeks old, grown in coco coir/perlite/clay balls.
I'm still using 1/4 strength nutes.
They have been developing spots or marks on the leaves, and I'm completely unsure of the cause.
I've attached some pics to take a look at. Any help would be greatly appreciated.

Cheers!

[ellz]

Looks like a bug problem but exactly what bug problem is a bit of a question. Spots on the leaves are often a sign of spider mites (I am currently battling those and my leaves look a bit different from yours). Another possibility is fungus gnats. Another possibility is slugs/snails. I would say look through the following page and try to identify anything that looks like your current grow. http://www.growweedeasy.com/bugs-pes...marijuana-grow

Typically you can salvage your crop if you stop a bug problem early on. It looks like you may have one but I am curious to see other replies on this. Best of luck with it!

[Green75]

What is your ph in and coming out..
can you show pictures of the underside of the leaves as well..
Are you currently using any calmag..

[Jordog05]

Looks like a bug problem but exactly what bug problem is a bit of a question. Spots on the leaves are often a sign of spider mites (I am currently battling those and my leaves look a bit different from yours). Another possibility is fungus gnats. Another possibility is slugs/snails. I would say look through the following page and try to identify anything that looks like your current grow. http://www.growweedeasy.com/bugs-pes...marijuana-grow

Typically you can salvage your crop if you stop a bug problem early on. It looks like you may have one but I am curious to see other replies on this. Best of luck with it!

Thanks for the response mate. I've inspected the underside of the leaves thoroughly and can't see any signs of mites/bugs. I'll take a look at the link though. Cheers!

[ellz]

Here's hoping you resolve it and have an awesome yield!

[Jordog05]

What is your ph in and coming out..
can you show pictures of the underside of the leaves as well..
Are you currently using any calmag..

PH has been a steady 6 going in. I'll measure the run off now and get back to you. Yeah I've been running Cal/Mag. Cheers man.

[Kpenn]

second to last pic, the one with the little white squiggly looks like a leaf miner.

[ellz]

Was thinking that too...or slug/snail trails. Good call!

[Kpenn]

[Jordog05]

second to last pic, the one with the little white squiggly looks like a leaf miner.

Hmm true. Maybe it's a few different problems as opposed to one.

[carblevel]

I agree with Green75 looks like calcium deficiency or ph fluctuation. I had a similar problem growing in coco, you really have to keep up with the calmag ......your plants might need a touch more. Good Luck!!!

[Jordog05]

I agree with Green75 looks like calcium deficiency or ph fluctuation. I had a similar problem growing in coco, you really have to keep up with the calmag ......your plants might need a touch more. Good Luck!!!

Yeah ok thanks for that. I've had a similar response from people on other forums. I'll measure run-off, adjust accordingly and up the Cal/Mag. Cheers.