Bs. Correaferreira et F. Moscardi, SEASONAL OCCURRENCE AND HOST SPECTRUM OF EGG PARASITOIDS ASSOCIATED WITH SOYBEAN STINK BUGS, Biological control, 5(2), 1995, pp. 196-202
In surveys conducted in soybean fields of Northern Parana State, Brazi
l, 20 species of microhymenopterous parasitoids were observed as egg p
arasitoids of stink bugs, mainly represented by the families Scelionid
ae, Encyrtidae, Eurytomidae, and Pteromalidae. When total parasitized
eggs were considered for each host species, Trissolcus basalis (Wollas
ton) and Telenomus podisi Ashmead were the most frequent and prevalent
species, with Tr. basalis being preferentially associated with Nezara
viridula (Linnaeus) (98%) and Piezodorus guildinii (Westwood) (44%),
while Te. podisi was more prevalent on eggs of Euschistus heros (Fabri
cius) (73%), Podisus connexivus Bergroth (61%), and Dichelops melacant
hus (Dallas) (50%). The parasitoids Gryon obesum Masner from eggs of N
. viridula and Eu. heros and Trissolcus urichi (Crawford) from eggs of
Edessa meditabunda (Fabricius), Eu. heros, and Thyanta perditor (Fabr
icius) mere recovered for the first time in Brazil, In the surveyed so
ybean areas, the natural parasitism was very high, reaching maximum va
lues of 62% on N. viridula eggs, and 60 and 57% on Eu. heros and Pi. g
uildinii eggs, respectively. The parasitoids maintained reproductive a
ctivity on these hosts practically all year long, with higher populati
onal densities from October to December and at the end of the soybean
season (March-April). (C) 1995 Academic Press, Inc.