Leaf problem .

I thought it was spidermites and turned the leafs and saw nothing then i sprayed them on and under just in case . So i don't think spidermites waiting for a second opinion . I grow soil,ph 7-7.5,week 3 of flower . watch for the white dots .

i would say one of two in order of likeliness
1. Slight Nute burn common at beginning of flowering with introduction of bloom nutes and not knowing how a strain will react
2. PH Fluctuation can cause similar looking problems as nute burn (PH test water)

that "burn" is from me trying to scratch the powder .

look for thrips.ive had similar looking leaves only to find a bunch of adult thrips sucking the life out of the tops of my leaves and larva on the underside.my plants were mature females so i had to use a pyrathrum TR bomb(which worked 100% the first time,killed all those little fuckers).your plants are still babies so if you see them just smash them with your fingers.adults are black,about the size of a pin head(look like little alligators under a microscope)and the larva are white.good luck!

didnt notice your were three weeks in,yeah man check for thrips>

LOL
The white "powder" is the leaf itself its nothing to worry about. When plant goes into flower it shifts its energy from making leaves pretty and healthy to producing buds.
I had some like that didn't make a bit of difference in the end

thrips leave more distinct marks tho which is why i marked em off my list
thrips leave distinct "white spots" where they literally suck the chlorophyll out of a leaf
this is more of a fuzz imo

Get other opinions but those chems to kill em are dangerous

i woulnt think your not far enough into flower for your leaves to change color naturally,that will start to happen in about 3-4more weeks.so IMO you should not(just dont worry about its fine,unless you think about your yield as dont worry its fine)id keep searching for an answer.

thrips dont leave white spots.

this is a better looking photo of the dots , i didn't noticed any flying thrips in the grow room it's about 1 week and a half when i first saw the dots . And the larvea looking trail is milk ) .

do you have a trich scope?

no, i have only a 13x magnifying glass .

radio shack has them for 12$ 60-100x.that will be your best bet to really find out what they are.

Another detail about the "powder;dots" if i scratch the leaf with my nail pretty gently it goes away but, some of the dots remain , i think is powdery mildew or some type of mold(what do you think?) or as other that posted to this threat is bug damage but I can't found any moving bugs on the leafs or under them .

whats your humidity at?

drew k.420 said:

thrips dont leave white spots.

Click to expand...

Umm yes they do



Proof
"Thrips feed on the foliage and flowers, as well as young tissues in shoot apexes where the leaves are expanding. They puncture the plant cells with their rasping-sucking mouthparts and withdraw cell sap. Feeding activities produce bleached, silvered or deformed leaves and necrotic spots or blotches on flower petals."
http://www.entnemdept.ufl.edu/fasulo/woodypest/thrips.htm

Humidity is at : 50-60% but is a very well vented room . And the weedguy i don't have those spots on leafs or if u noticed them they are from milk sprays for powdery mildew , but thanks for the help you are really a good mate .

bump , other ideas ?

i knew you didnt have i was trying to educate other riu members who thought thrips didnt cause white spots = p
thx tho