New host for the parasitoid Pachycrepoideus vindemmiae ( Rondani ) ( Hymenoptera : Pteromalidae ) in Brazil

Recebido em 29 de setembro de 2004 Aceito em 22 de novembro de 2006 E-mail: chmarchiori@yahoo.com.br The Pteromalidae is cosmopolitan in distribution and is one of the largest families of Chalcidoidea, containing over 3000 recognized species in nearly 600 genera. The modes of carnivore encountered in the family are very diverse, encompassing idiobiosis and koinobiosis, ectoparasitism and endoparasitism, solitary and gregarious and primary and secondary parasitoids (Gauld and Bolton, 1988; Hanson and Gauld 1995).

The Pteromalidae is cosmopolitan in distribution and is one of the largest families of Chalcidoidea, containing over 3000 recognized species in nearly 600 genera.The modes of carnivore encountered in the family are very diverse, encompassing idiobiosis and koinobiosis, ectoparasitism and endoparasitism, solitary and gregarious and primary and secondary parasitoids (Gauld and Bolton, 1988;Hanson and Gauld 1995).
The objective of this note is to relate the new host for the parasitoid P. vindemmiae in Brazil.
The study was carried out in the city of Itumbiara, GO (18º25´S -49º13´W), Brazil.Fresh feces were collected immediately after emission and mixed in 20-liter pails.Artificial 2liter fecal pats were produced and placed inside 10 plastic buckets (40cm diameter and 12cm height), containing a layer of 5cm of soil collected from the pasture.A few holes were made in the bottom of the buckets to allow water drainage.The buckets were then taken to the pasture, to serve as substratum for the colonization and development of flies, and stayed there for after ten days of exposure and then, were taken to the laboratory.The buckets were covered with a fine mesh fabric, and kept in the laboratory where the pupae were extracted by water flotation.The pupae were individually placed in gelatin capsules (number 00) and kept until the emergence of the adult flies and of their parasitoids.
From June to August 2004, two specimens of P. vindemmiae were collected in 16 pupae of Cyrtoneurina pararescita Couri (Diptera: Muscidae).The percentage of parasitism was 125.%.The fact to attack several dipterous, favors P. vindemmiae permanence in the environment, improving its potential as biological agent (Marchiori et al., 2002).
For control fly, the natural regulators can be used, such as parasitoids that are the responsible agents for the reduction of the synanthropic fly populations.This paper registers the first occurrence of parasitoid P. vindemmiae in pupae of C. pararescita in Brazil.