White vague spots on leaves (POWDERY MILDEW?)

Can anyone identify these weird white spots?
I can only find them on one side of my plant, which is very weird because I rotate the plant daily.

Plant: Super Silver Critical Haze (100% natural/organic growing)







I don't have a lot of bugs (knock on wood); I used neem oil before the buds got big, and now because I don't have any caterpillars and just a few white flies I'm not using any.

I'd like to say that I'm an experienced grower, every year I grow a plant or two, make clones etc.. All for PERSONAL USE.
Have had a lot of different pests so I know how to identify them.
But this is new to me :S
I would think it is not mold (don't have experience with that, because I've always avoided it) because it is very dry where I live (Spain) and when it does rain I make sure it will be dry and sunny weather the next day if not I put the plants under cover.

I hope someone can help me! Thanks
Happy smoking!

I'm not an expert on the topic but it might be powdery mildew. Do some searching around here there will plenty of posts with better info on it and getting rid of it.

Thanks, Ill do some research on that.

What I've quickly found just now, mine don't look so bad.. yet.

If anyone has got a definite solution that would be highly appreciated!

yeah that's PM.

a sulphur burner will help to prevent the spores from appearing. the plant could well build its own immunity too... but best to get in a nifty tool like a sulphur burner.

Okay, thanks for confirming. I'll go to the growshop and see what they have. Thanks!

I just found this:

Description:

Powdery mildew is a fungal disease that results in a powdery gray or white coating on the leaves and stems of infected plants. It starts out as a few spores on the leaves, and quickly spreads, eventually yellowing the leaves and causing premature leaf drop.
Damage to Plants:

Besides being unattractive, powdery mildew results in leaf yellowing and droppage, stunted plant growth, distortion of buds, blooms, and fruit, and eventual overall weakening of the plant.
Disease Life Cycle:

Spores overwinter on diseased plant parts, and begin asexual production of new spores once the weather warms. New spores are carried on the wind to other parts of the plant, or to other nearby plants. Spores never stop producing more spores, so if infected leaves are not destroyed, the problem will only get worse.
Treatment and Prevention:

Powdery mildew thrives in temperatures between 60 and 80 degrees. Dry, shady conditions are ideal, as are areas with poor air circulation. Planting disease resistant cultivars and making sure you allow for good air flow are two ways to guard against powdery mildew. Inspect plants regularly during warm, dry conditions, and remove any leaves that show signs of infection. Destroy (do not compost!) infected plant parts. A spray made with baking soda, if applied weekly at the first signs of infection, can protect plants against further damage. Plants that are badly infected should be ripped out and destroyed to prevent the disease from spreading further.

A commercially available organic option is Neem oil, which both treats existing powdery mildew and protects the plant against further infection.

Interestingly enough, the most effective measure in preventing and treating powdery mildew is to spray the foliage of your plants daily with plain water from the hose. Powdery mildew hates water! The only caveat with this method is to be sure you do it early in the day so that the foliage completely dries before cooler evening temperatures arrive, otherwise you may invite other fungal diseases, such as black spot, into your garden.

Do you think this is true about the neem oil and that PM doesnt like plain water? Sounds strange to me since I thought PM is a sort of fungus and grows with moist...

yeah not sure on the water thing.

PM is a systemic disease, usually by the time you see the spores it is too late. the disease is inside the plant. i have no idea baout neem oil as I've never used it. sulphur burners work for me. they stop the spores from reproducing and serve to dry them out. PM likes it moist so i'm not sure why they've written that.

ive used PM wash with relative success.... but its $$$$$$$$$$.... prevention is best!

there are many strains out there with PM immunity. I know this as this a basis by which i select my mothers. PM immunity is essential. Good fungal immunity is good fungal immunity, meaning th eplant should also be able to fight off grey moulds too (bud rot).