Beginner Gardening: Early Blight on Tomato Plants?, 1 by feldon30

feldon30 wrote:
TSWV is very new to California. First outbreaks in 2003. Still not being found on a large scale as of 2008.

http://westernfarmpress.com/vegetables/tomato-virus-0822/

Note there are a lot of bad pictures out there which do not really show what I consider the classic look of TSWV.

I would check out this thread:
http://www.tomatoville.com/showthread.php?t=1519

TSWV can exhibit as a purplish spotting of leaves especially along the veins (centers of the leaves). It can also exhibit as a purplish bronzing of the leaves especially around the veins.

I've attached a photo, and there is also an excellent photo at UT Knoxville here:
http://eppftpserver.ag.utk.edu/profiles/disease/vegetable/TS...

I really hope you don't have TSWV because it is devastating (plants must be pulled immediately to prevent the disease from being spread to other plants) and the thrips (very small flies) which transmit the disease infect the plants before you can kill them with pesticides.