Hi, the leaves on my peppers are turning yellow and look singed around the edges; then fall off. This is happening from the bottom up. Someone please help. They are planted in the ground and the ground was fertilized with 10-10-10 prior to planting.
Thanks
DS

Welcome to NGA, @DS82308 .

Were your plants "hardened off" (gradually accustomed to being in the sun and wind) before planting out? The leaves appear to me to be burned by either the sun, or possibly the fertilizer.

How long have they been in the ground?

with Weedwhacker

@ds82308
Don't despair, I've had that "look" before, too. Cubanelle's are very hardy and will grow new richly colored green leaves at every junction as they recover from transplanting, but still - should be protected from frost, they hate to be cold. Don't know your hardiness zone, so it's hard to advise you specifically about planting date in your area.
When I plant my peppers, I rototill, rake in fertilizer, roll out 3 ft wide 4 mil black plastic over top the row & tuck in the edges, score an "x" in the plastic and plant my peppers after all danger of frost is gone. Soil temperature should be at least 60 degrees. The black plastic maintains moisture, heats up the soil and controls weeds.
The cubanelle's have a thick leaf canopy and when planted in a 12" between-plant spacing, creates a wonderful green hedge in your garden at maturity. I leave my cubanelle peppers until they turn red and vibrantly sweet. This rich flavor is wonderful in soups, stews, sauces, frozen - or dried and used as a seasoning rub. At season end - don't let your fruit get frosted, they'll be lost.
Have a wonderful growing season ! Oh...and to the discussion board !