Mrs. Robert G. Wuetcher wed at 9 a.m. yesterday. Trunnell Wiielcher St. Thomas More Church at 9 a.m. yesterday was the scene of the wedding of Miss Joan Marie Trunnell, daughter of Mr. and Mrs. Ernest B. Trunnell, and Mr. Robert Gerald Wuetcher, son of Mrs. John S. Wuetcher. The service was read by the Rev. Hubert Hagan. The bride wore a gown of white Chantilly lace and carried stephanotis with a white orchid. She was attended by Miss Helen Dillon, maid of honor: Mrs. John S. Wuetcher, Jr.. and Miss Elaine Beierle, bridesmaids. Mr. John S. Wuetcher, Jr., was the best man, and the ushers were Messrs. Jack Lacer and Ir-vin Metz. An afternoon reception was held at the home of the bride's parents.