All my toms were hit this season. We had an unusually wet spring and summer into fall here in NW WI. I was online to confirm that I would use a 1:10 bleach solution on the cages to kill the fungi spores when I ran across this on http://homeguides.sfgate.com:
" You can help prevent early blight and late blight by inserting copper wire into the stem of a tomato plant when the stem is about as big around as a pencil.
Cut 16-gauge copper wire into 3 inch pieces by using the wire cutters.
Measure upward 1/2 inch from the soil level on a tomato plant's stem. Push a 3-inch piece of copper wire through the middle of the stem. Center the wire in the stem, and bend the wire's ends downward at a 90-degree angle. Repeat the procedure for all the tomato plants you want to treat.
Put on eye protection. Pour 3 percent hydrogen peroxide into a new spray bottle. Do not breathe in the hydrogen peroxide's vapors. Do not add water to the spray bottle.
Spray each tomato plant with the 3 percent hydrogen peroxide. Cover each plant entirely with the spray. Repeat the 3 percent hydrogen peroxide spray application every seven days during the growing season."
Seems like torture to me, but if anyone here has tried it I would love to know how it turned out.