Some insects attack the fruit, while others damage the vines. In either case, damage reduces the economic returns of the marsh. The two most significant insect pests of cranberries in Wisconsin are the Black Headed Fireworm and Cranberry Fruitworm. Other significant pests include Cranberry Girdler, Tipworm, Sparganothis Fruitworm and some general spanworms. However, these pests are not economically significant on every marsh every year.
Growers monitor insect populations within the marsh using pheromone traps and by sweep netting.
If significant damage is imminent, an approved insecticide is applied. Many growers contract with pest management consultants for scouting services. Disease Management Several diseases cause economic losses for cranberry growers in Wisconsin. The most significant one is Cottonball disease. Although Cottonball disease is not widespread, when it does occur it can cause substantial losses.