Yes, Sevin seems to work in my backyard garden. The guys growing soy and cotton in the local fields apparently don't use anything so benign.
Mount Olive?! LOL No wonder your lettuce is still going! I’m in Newport. It’s a whole nother world, climate wise! LOL Ours was great while it lasted. I had a spinach bowl, and a bowl of red sails, buttercrunch, and green ice.