Hi guys, I went to water my about three week old plant today (sprouted on 4-11) and I found it bottom leaf, not the round, but the jagged looking one above that, looks pretty bad. I almost looks like all pigment has died on half of the leaf and has now spread to a top leaf. Could this be spider mites?

it is an outdoor grow in the woods and is planted in a 50/50 mix of MG organic soil and soil already at the plot and also has some perlite mixed in. The soil is at about 7 maybe a little bit lower.

Links to pics....
http://tinypic.com/r/e6brx5/7

http://tinypic.com/r/qzghhi/7