Publications for:

pest = Helicoverpa zea
crop = Alfalfa/lucerne (Medicago sativa)
country = U.S.A. (mid S)

found 2 publications:

1985

Parasites of Heliothis spp. (Lepidoptera: Noctuidae): Parasitism and seasonal occurrence for host crops in the Texas Rolling Plains
Environmental Entomology (1985) 14 (4), 441-446
pestinfo wiki

1984

Parasitic insects associated with lepidopterous herbivores on alfalfa in Oklahoma
Environmental Entomology (1984) 13 (3), 787-793
pestinfo wiki