The BioCare® Ladybug Lures contain a pheromone which acts like a magnet that tells beneficial insects, such as ladybugs, where to find food. Use Ladybug Lures with live ladybugs to keep them in your garden longer. Each package contains four lures. Replace lures every 3 to 4 weeks. Helpful hint: Place the lures whenever aphid infestations are seen. Use 1 lure every 6 feet through your garden or green house. Contains 4 lures.