Yellow-white Leaf dots

[GanjaStyle]

Hi everyone,
I am new to cannabis growing. My Indica plant is 3 months old, 2 weeks into the flowering light cycle. On the first flowering week the white spots began appearing on the leaves, starting from the middle of the plant. And rapidly spreading downwards. Some leaves began to dry out. Is that some kind of desease????
Soil: compost
Fertiliser: 20-20-20 (one teaspoon per 1L, every Sunday)
Water: tap water (high in Calcium)
Light source: Sun
Attachment 291111Attachment 291112

GanjaStyle Reviewed by GanjaStyle on 04-30-2013. Yellow-white Leaf dots Hi everyone, I am new to cannabis growing. My Indica plant is 3 months old, 2 weeks into the flowering light cycle. On the first flowering week the white spots began appearing on the leaves, starting from the middle of the plant. And rapidly spreading downwards. Some leaves began to dry out. Is that some kind of desease???? Soil: compost Fertiliser: 20-20-20 (one teaspoon per 1L, every Sunday) Water: tap water (high in Calcium) Light source: Sun 291111291112 Rating: 5

[Weezard]

Well, I don't see any bugs.

Take a close look at the spots.
First, try brushing them off. (long shot)
Do they look like some of the leaf has been eaten.
Thrips make those kine marks on the tops of leaves by noshing on the top layer.

If the surface is level, look on the bottom of the leaf with a magnifying glass.
Any eggs, poo, webbing?
No?

Dang!
So much for easy.
I don't like the looks of those fan leaves in the background.
It would be a good move to take some better snaps and fill out the troubleshooting form.

http://boards.cannabis.com/plant-problems/127058-troubleshooting-form-yay-you-know-you-wanted-one.html

We have some real talent here, but you have to help them help you.

Aloha,
Wee 'zard

[polishpollack]

what are the intructions on the container of fert you're using? what brand is it? The interesting thing about ferts is that they can say how much to give in a container of water, but they never say how frequently. it's up to the grower to decide how often. Also, what are the nutes in the fert other than the NPK ratio?

[GanjaStyle]

When i look at the spots, it seems like the green layer was cut out at the top of the leaf. And there is some transparent layer of the leaf.
I noticed some white web which looks like a snail trail on the bottom of the leaf. There were also some black spots. Fungus attack????

[Weezard]

Black spots,
Leaf chewed into?
Sounds like Thrips.

If so, you can get some advice here:
Cannabis FAQs / FAQ , Recipes, Medical Marijuana

The snail trial thing, sounds like leafminer worm.
Not a big deal.

However, If you use a > 30X lens to look at those "black dots", and they have 8 legs, you have a serious problem.
And will probably be assimilated.

Spidermites can spell doom. (When they're in the mood)
If you do have the "borg" get some pictures because they come in different flavors.
Some are tougher than others.


Havin' fun yet?

Aloha,
Weezard