Two antique tractors were rear-ended in separate traffic accidents Friday evening on 71 Highway south of Maryville.  One happened at 5:39 pm 9 miles south of Maryville.  Two hours later a second tractor was rear-ended on the same highway six miles away.  Both tractors were northbound.  The Highway Patrol says the driver of the first tractor, a 1959 John Deere, 70-year-old Larry Haist of Barnard, was taken to Saint Francis Hospital with serious injuries.  The driver of the pickup that hit him from behind, 60 year old Shirley Burgess of Saint Joseph, was taken to Saint Francis with moderate injuries.  In the second accident, a car occupied by four 19-year-old boys hit the rear of a 1953 International tractor driven by 47 year old Mark Beggs of Guilford.  Beggs was taken to Saint Francis Hospital with moderate injuries.  Both tractors were on their way to a tractor cruise fundraiser when the accidents happened.