Old Dominion Chrysanthemum Society will host a Q & A discussion this Sunday following a presentation on the “Preventive Measures for Coping with Common Garden Pests and Diseases.” Nikki Norton, Merrifield Garden Center’s Plant Specialist and Master of Horticulture will host the event beginning at 2:30 p.m. at the Falls Church Community Center. (223 Little Falls St., Falls Church). For more information, call Jim Dunne at 703-560-8776.