Screening of host species for the mass rearing of Telenomus remus Nixon (Hymenoptera: Platygastridae).
Telenomus remus Nixon is an important egg parasitic natural enemy of a variety of noctuid insects (Lepidoptera: Noctuidae). In this study, the parasitism and offspring development of T. remus on 5 host species (Spodoptera litura, Spodoptera frugiperda, Spodoptera exigua, Helicoverpa assulta, and Helicoverpa armigera) were compared in terms of parasitism rate, emergence rate, female ratio, and body size. The results showed that T. remus had the highest parasitism rate on S. litura eggs (94.48%), followed by S. frugiperda eggs (92.11%), and lower rates on H. assulta and H. armigera eggs (34.08% and 50.75%, respectively). The tibia of hind leg of female T. remus emerging from the eggs of S. frugiperda (166.48 μm) was longer than that of the female wasp emerging from the eggs of S. litura (159.22 μm). However, the emergence rate was lower from the eggs of S. frugiperda (68.06%) than that from the eggs of S. litura (92.04%). Fecundity was higher in wasps emerging from S. litura eggs than from eggs of the other four host species. These results indicated that S. litura could be a promising host for mass rearing of T. remus.