Quote: Just because they eat pumpkin and take dust baths doesn't mean they may not have an abundance of external parasites, especially with wild birds sharing their food.
Only way to know for sure is to check them off the roost well after dark, part the feathers down to the skin around the vent, head/neck and under wings and look closely with a flashlight for pests.
If they are of good weight, are active and have normal poops, they probably do not have an overload of internal parasites.
Days are shortening, that can stop laying in a bird older than it's first year of laying unless you use supplemental light.