I am growing indoors and I have noticed in the past week that my plants are all acquiring suspicious looking white-yellowish patches on the leaves. Also, the top canopy of leaves standing between the 10"-15" markings are beginning to turn from the dark healthy greent they were, to a yellow-green. What seems to be the problem? To diagnose, do you need any other info? Please hurry, we're worried.
Have you used any ferts yet? If you've ruled out any pest infestation then it's most likely a nutrient deficiency. Here's a couple links that can help determine the problem. http://users.lycaeum.org/~npkaye/chart.html http://www.overgrow.com/faq/browse.php?topic=64
Check on the underside of the leaves for little brown and white hunchbacked bugs. I recently lost all of my crop save 4 to these spider mites. Neem oil, or einstein oil works good
I don't think its spider mites, but if it is, take action NOW. I lost my entire crop as well (which was also my first grow) to those bastards. With spider mites, you get a white/gold speckling of dust(thats what it looks like) on the leaves.