Leaf Spotting: Your Diagnosis?

[JessieDiamond]

Any diagnosis on this spotting on the leaf? There are about 4 of these leaves on one plant, mid-plant.

Here's the link to the high resolution pic:
FileDen.com | Free file hosting and online storage (http://www.fileden.com/files/2009/7/23/2518920//Spotted Leaf 2.jpg)

The grow details are below.

TIA for any ideas!

~jessie

Current Grow Details

GROW STATUS: 15 plants, flowered March 1st, 2010 (after 6 weeks of vegging)
STRAINS: AK-47, White Widow, Ice, Chrystal, LA Woman
MAIN ROOM: 2 x 1000HPS, 6'x8' SCROG on Hybrid Drip/DWC
NUTES: Lucas Method. Nutes usually around 1,000PPM.
CO2: Yes
TEMP: 70- to 90-degrees
HUMIDITY: Recently upped to 50%, from 30%
PH: Low 5's, checked regularly.
-------------
TWO MAIN PROBLEMS:
--1) SATIVA LEAF CURL (aka, "the Claw). Some bud leaves are curling under on two plants. Changes to the obvious causes hasn't helped.
--2)SPOTS ON A FEW LEAVES: Yet To Be Diagnosed. Topic of this post. :-)

[Vancefish]

You have spider mites!

[busybee]

You have spider mites!
:thumbsup:i agree!!:jointsmile:

[drgreenleaves]

are you spray any nutes on your canopy? if you are, that may be the issue for both problems. some sativas are super sensitive to sprays.



or you have spider mites.

[pappabear]

Get yourself a magnifying glass, looks like you have mites!! Are you using Neems oil? To late to help but ladybugs are good to have around, they eat mites and other nastys.

[metik2009]

I'm with these guys! It looks like you got spider mites. Get some neem oil concetrate (as pure as you can), dilute it accordingly, and spray your plants every 3 days. Neem oil makes the bugs unable to reproduce, so you need to spray in coordination to their life cycle, which will cause the problem to stop. Keep the treatment going for like 2 weeks until your leaves have a shiny and waxy coating on them.

[Rusty Trichome]

Make sure you have spider mites before you attempt a treatment.
Could also be leaf-irritation from other leaves rubbing against it.
-or-
It could be splashes of nutrient solution left to sit on the leaf.

I'm not disagreeing with the spider mite hypothesis, but make damn sure before you start adding bug poison to your schedule. If you are forced to go the insecticide route, do not let it sit on the leaves, as the crap clogs the leaf stoma (http://en.wikipedia.org/wiki/stoma) which prevents gaseous interchange. (stops respiration - suffocates the plant)

The claw is usually from ph issues, being rootbound and sometimes from overwatering.