"It arcs down on this woman who is running away as it hits her," he said.
Aronson said the woman appeared motionless as people gathered around her. A short time later, the competition's announcer asked the crowd to pray as she was flown to a hospital. The announcer then said the contest was over, Aronson said.
Aronson said organizers tried to take precautions by using nets and placing spectators 25 yards away from the pumpkin launchers.
Master Cpl. Jeffrey Hale of the Delaware State Police said the woman and man who were injured were not part of the crowd of spectators but were among the launchers. He said they were observing the event but declined to elaborate. Hale said the incident remains under investigation.
Punkin Chunkin dates back to 1986. It had been canceled for the past two years because of problems finding insurance.
In 2014, a Sussex County farmer stopped making his property available for the contest because a volunteer was injured in an ATV accident and filed a lawsuit. The suit was later dismissed. Organizers for the 2016 contest said an insurance policy was in place to protect the landowner.
Information from the Associated Press and 6ABC was used in this report.