Q.Green Pepper plants
I live in NW Iowa, and my green pepper plants grew average and have now bolted to 2 feet. My problem is the four pepper plants have never fruited. It’s 8/23/2016 and they may have 1-2 tiny peppers. It appears that they are just now bearing very very little peppers. We had bursts of hot hot weather in early July. What causes this to happen? I’ve always had an abundance of peppers.
Extreme temperatures can indeed kill flowers before they fruit, and can also stress plants so that they don't have as much energy for fruiting. These articles provide more information: