How can I effectively control and manage a fennel caterpillar infestation in my garden?

To effectively control and manage a fennel caterpillar infestation in your garden, you can use natural predators like ladybugs or parasitic wasps, handpick the caterpillars off the plants, spray with organic insecticidal soap or neem oil, and rotate your crops to disrupt the caterpillars' life cycle. Regular monitoring and early intervention are key to preventing a severe infestation.