In my experience they will move to the fields if they are already on the ground.Last fall on the last day of the season the birds were still roosted at 9:30 am and I was about to give up because it was pouring and cold. So I tried one last thing in my bag of tricks. I bumped them off the roost then moved to a field edge where 4 gobblers came from the roost. Needless to say I had a bird by 10:30 and was giving Mr. longbeard a ride with me.