Dragonflies:high dispersion - greater than 1/4 mile. If you have bodies of water nearby, then dragonflies and damselflies could aid you. Pest butterflies are targets for dragonflies - we have seen mid-flight nabs of imported cabbageworms by dragonflies. More adult predators of butterflies are needed, so dragonflies can help in that category. Dragonfly larvae are aquatic predators of other insect larvae and even small fish - construct ponds.