Inspect incoming plants for signs of mealybugs
Start with clean plant material
Do not hold over "pet plants" that may be infested, and keep greenhouses as weed free as possible
Immediately dispose of heavily infested plants
Power wash infested benches between crop cycles
Do not reuse pots without thorough cleaning before reuse
Maintain proper fertility levels for the crop you are growing. High nitrogen fertility favors mealybug reproduction