Larval and adult (A. fuscicollis) populations in various plant growth stages, including the corn germinating (A’) and flower vegetative (A) stages, the corn jointing (B’) and flower blossom (B) stages, and the corn (C’) and flower withering (C); average statistical data from 2016 to 2017. Different colors refer to the adult and larval densities in the field and flowers and grasses belt.