Future Farmers of America (FFA) Agronomy Career Development Events (CDE) Practice Exam

The adult Green Lacewing primarily has a beneficial economic impact due to its role as a predator of various pest insects. As an insectivorous species, adult Green Lacewings feed on pollen and nectar, but it is their larvae that are particularly well-known for their predatory behavior. Lacewing larvae are effective at controlling populations of aphids, thrips, and other soft-bodied pests that can cause significant harm to crops. This natural predation helps reduce the reliance on chemical pesticides, leading to more sustainable agricultural practices and potentially lower costs for farmers.

In contrast, the other options suggest harmful impacts associated with plant damage or destruction, which does not align with the role of the adult Green Lacewing in agricultural ecosystems. By understanding the beneficial nature of this insect, it becomes clear why choice B highlights the positive economic impact of adult Green Lacewings rather than inferring any damage to crops.