Yes, your plants can recover from bacterial leaf spot if the damage stays mild. Plants with less than 30% leaf loss often bounce back once your weather turns dry and warm. Heavy infections that strip most of your canopy leave a plant too weak to produce a full harvest though.
I watched this play out in my pepper patch last summer. One row with light spotting lost about 15-20% of its leaves before a two-week dry spell hit our area. Those plants pushed out fresh growth fast and set fruit right on time. The row next to it had lost more than half its canopy already. Those pepper plants got sunscald on exposed fruit and never caught up to the first row. That experience taught me that plant recovery leaf spot outcomes come down to how much green your plant still holds on to.
Here's why the damage sticks around. Bacteria kill your leaf cells for good once they move in. The brown spots you see are dead zones that won't turn green again. Your plant has to grow brand new leaves to replace what it lost. That effort takes energy your plant would rather spend making fruit. Every new leaf your plant builds to replace a dead one means fewer peppers or tomatoes on your harvest table.
WVU Extension data gives you a reason to be hopeful though. Their research shows that three or more weeks of low humidity below 40% stops bacterial spread for good. Once the disease stalls out, your plants with enough healthy leaves can start to rebuild. The bacteria won't bounce back after that long dry window. This is your plant's best shot at plant recovery leaf spot damage. You just need enough canopy left to fuel the comeback.
The hard part is knowing when to save your plant and when to pull it out. I've made the mistake of nursing sick plants along for weeks and ending up with bare beds at harvest time. If your plant has lost more than 50% of its leaves, the math works against you. It will spend the rest of the season growing new foliage instead of setting fruit. You're better off pulling it and planting a healthy replacement in that bed space.
If you decide to save your plant, cut back on watering and switch to drip lines if you haven't done that yet. Stop all overhead water right away. Feed your plant a light dose of balanced fertilizer to help it push new growth. Watch those new leaves for any returning spots so you can catch a flare-up before it spreads again.
Full bacterial leaf spot damage reversal isn't something you should expect because dead tissue stays dead. But your plant can grow past the problem and still give you a decent crop if it keeps most of its canopy. The key factors working in your favor are dry weather, quick action, and enough healthy leaves to power new growth. Don't give up on a plant with light damage. Just don't waste your time on one that has already lost the fight.
Read the full article: Bacterial Leaf Spot: How to Identify and Control It
