Zone 7 near Annapolis Maryland.
I may have some tomato success this year. Planting in same bed (8 hrs sun). Prior years the “blight” got them at late August and they grew very lanky/spindly. BUT got some “Copper Mixture” (I think it is also called Bordeaux Mixture) and put it on every 10 days to soil around the plants to inhibit fungus. They are now strong & healthy foot tall with many leaves and stem 3/8” to 1/2” wide. Started from seed late Feb... in garden 1st week of April (we had a mild spring... covered them 2-3 nites with no loss)
Copper is my Secret Weapon for fungal/blight issues on just about anything. AlgoFlash is my go-to fertilizer for just about everything, and a Bloom Booster (Miracle Grow) for hanging baskets, porch pots and in-ground flowers.
Also, make sure tomatoes and peppers and eggplant and zukes & cukes have good spacing; crowding results in poor air circulation and sets the stage for disease later in the season.
Bordeaux is good. I have used it in the past.
I trim off any leaves touching the ground. That helps a lot.
I like to use liquid foliar feeds. Just a mixture of seaweed, molasses, apple cider vinegar, and fish emulsion.
I also pour out out of date milk around the base and all of my used tea/coffee grounds make a good fertilizer.
And epsom salt in low doses.
We also have grown toms crowded in the same soil for many years (a non no) and had some "blight" in 2019 but worse last year when the dozens of plants were growing great until about mid-August when the blight began and which wiped out about half or more of the crop. See here. Last year i did use a copper based fungicides and the plants were recovering but the warm weather ran out, as it does after about 5 months here.
Meanwhile, i read of
http://northcoastgardening.com/2015/05/tomato-blight/
Oxidate, made of activated peroxide, is [said to be] another safe and effective product to keep plants sterile and clean of blight. - http://northcoastgardening.com/2015/05/tomato-blight/