For fast, accurate kill of wasps, yellow jackets and hornets, use Ortho Wasp B Gon MAX Wasp Killer Foam. This rapid-action foam kills wasps in seconds. Delivers a sticky foam that blankets both wasp and hornet nests. Provides residual kill of insects returning to the treated nest, too. It is recommended that you spray at sunrise or sunset when insects are least active. To use, stand a safe distance from wasps or hornet's nest, spraying until the nest is saturated. This triple action jet spray foam threat is accurate, reaches nests under eaves, around carports, doorways and window frames, and kills insects returning to the nest. Can also be used in picnic and play areas.