Multiparasitism of Piezodorus guildinii eggs by Telenomus podisi and Trissolcus urichi

CINGOLANI, M.F.; GRECO, N.M.; LILJESTHRÖM, G.G.

BIOCONTROL (DORDRECHT)

SPRINGER

Lugar: Berlin; Año: 2013 vol. 58 p. 37 - 44

1386-6141

Multiparasitism involves competition between larvae inside the host. Telenomus podisi (Ashmead) and Trissolcus urichi (Crawford) (Hymenoptera: Platygastridae) are solitary egg parasitoids of Piezodorus guildinii Westwood (Hemiptera: Pentatomidae), an important soybean pest. Egg masses partially parasitized by one species were offered to females of the other species. Both species attacked randomly unparasitized and parasitized hosts. Trissolcus urichi had a greater emergence proportion than T. podisi from multiparasitized eggs, although lower than emergence from eggs parasitized only by T. urichi. Each species emergence was independent of the order in which they parasitized and of time elapsed between ovipositions. Progeny sex ratio obtained from multiparasitized and from parasitize eggs were similar for both parasitoids. Our results suggest that T. urichi is a better intrinsic competitor than T. podisi on P. guildinii eggs. However, in the field T. podisi was the dominant species, and T. urichi would be using other pentatomids eggs as resource.