The spots look like they could possibly be pest damage... are there any pests?

Far be it for me to give advice to a farm, but in my garden I wouldn't pull the plants, unless it was very isolated. It seems unlikely it will do all that much to slow it down, and you could still get a harvest from the plants.

Hope you figure out what it is.

It could be Downy Mildew, but that has more of a checkered look.. https://www.cals.ncsu.edu/plantpath/extension/fact_sheets/Cucurbits_-_Downy_Mildew.htm

https://www.cals.ncsu.edu/plantpath/extension/fact_sheets/Cucurbits_-_Downy_Mildew.htm

Looks like Downy Mildew to me. I would suspect some other disease, maybe early blight or septoria leaf spot, to be affecting your peppers.

Rodney

I just updated my post -- Downy Mildew has more of a checkered look, at least AFAIK it looks that way to me. These are round random spots.

I have looked for squash bugs and vine voters but have not found any pests. I'll examine again this afternoon.

I was leaning towards phytophthora blight. Any one have experience with that?

Unlikely to be Phytophthora since you have not mentioned any stem rot or sudden wilting.

I still say it is Downy Mildew. From the link: "Initial symptoms of downy mildew observed in New York include small yellow spots (figs 1 and 3) and small
irregular black spots with yellow-green border (fig 4 and 5). First symptoms also can be a water-soaked
spot (fig 2)."

Isn't that exactly what is seen in the above photos?

Rodney

That's interesting, it looks like it has many different presentations. Those pictures look very different than say, figure 1 here: https://www.cals.ncsu.edu/plantpath/extension/fact_sheets/Cucurbits_-_Downy_Mildew.htm

Not sure why everyone is always so quick to pull mildly infected plants rather than treat them - especially when there is still so much healthy looking foliage - but it sure seems a common response. Totally healthy plants are a rarity in weather such as many have had this year. Many of the common garden diseases are treatable, not cured, but slowed down substantially so crops can be harvested.

In this particular case it honestly makes no difference if it is PM or DM (my impression) or anthracnose, or grey mold since the treatment is the same - remove all infected foliage and regular spraying with the fungicide of your choice. Are some fungicides better than others? Sure. Are some much better than others? Definitely. But it is your choice. If one isn't working then switch to another.

Dave

I pulled a few that were completely wilted or dead. I weeded the rest well to allow better air flow. They were all treated this morning.

Found stem rot:

Water soaked spot:

Leaf damage:

Yellow squash fruit rot:

Now this is spaghetti squash about 75' from above photos. Definitely looks like powdery mildew and is different than other squash problem.

I found no pest. Most problems on yellow squash and zucchini, slight on butternut and acorn, nothing on melon or watermelon. I will remove infected areas and continue with fungicide.