I'm no expert, but looks to me like over/under watering and/or sunburn.

I like to keep mine in partial shade depending on how hot it is, even in the UK. As for the watering I tend to let them go a little droopy, but as I say I'm no expert, so maybe someone else can sugar something better :0)

Not the best hosting service even when magnified, but the pepper shows nutrient deficiency and very poor sanitation & weed control. The pep fruit looks like BER from here which is inconsistent water. Spinach pic no help. Tomato doesn't do much for me either but one on the left shows nutrient deficiency, and main plant might be early blight if it started at bottom and worked its way up with brown spotting of lvs then spreading to entire lf, then plant from bottom up.

Dan

If you mulch under the plants as soon as you plant them with grass clippings, hay, newspaper, plastic mulch or what have you, you can stop diseases in the soil from splashing up on the leaves in rain. Guess the root and stem is more resistant than the leaves. Mulching also retains water and that helps the plant to have more consistent water levels. Is your Florida soil sandy? If so you need mulch even more, also till in lots of organic matter like compost every year. I've heard that Florida swamp muck is great if you can get it.

Pesticides and fertilizers that are rated safe for lawns might not be safe on plants you want to eat. I spray Sevin with Miracle Grow. Have read that if you get the powdery mildew, spraying your plants with diluted milk stops it by changing the ph. But I have not tried it.

What are your watering and fertilizing practices?

How did you prepare the soil?

And, why did you did you use a pesticide? What were you trying to kill?

Here is the MSDS for Hi-Yield 38 Plus Turf Termite & Insect Control. I would not have put this on my plants.

I have my plants in self watering containers. When I filled the pots i used a good potting soil, mixed with cow manure and dynamite fertlizer for vegetables.

I was using a pesticide because I thought it has a pest, for me looks more like a disease

any clue?