Seleção hospedeira, controle de qualidade in vivo e criação in vitro de três espécies de tricogramatídeos neotropicais / Host selection, in vivo quality control and in vitro rearing of three neotropical trichogrammatid species

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Trichogramma atopovirilia Oatman &Platner, 1983, Trichogrammatoidea annulata De Santis, 1972 and Trichogramma bruni Nagaraja, 1983 are species that occurs naturally in Brazil and just like other species of Neotropical trichogrammatid, they have potential for utilization in biological control programs. Therefore, for this strategy to be implemented, it is necessary to establish an efficient mass rearing system, based mainly on the choice of suitable hosts for multiplication of quality parasitoids. Frequently used factitious hosts are Sitotroga cerealella (Olivier, 1819), Anagasta kuehniella (Zeller, 1879) and Corcyra cephalonica (Stainton, 1865); the cost of production of these hosts is equivalent to more than 70% of the production costs. A rearing system which does not depend on these hosts such as in vitro production could be ideal to simplify production of parasitoids. The objectives of this work were to: 1) select the most suitable factitious host for rearing of T. atopovirilia, T. annulata and T. bruni, and evaluate the effect of rearing these parasitoids for successive generations on their biological characteristics including flight capacity and fertility life table and 2) study the viability of in vitro rearing of these parasitoids. It was concluded that factitious hosts affected biological characteristics and flight capacity of the studied species. For T. atopovirilia, C. cephalonica and/or A. kuehniella were the most suitable factitious hosts for its rearing, while for T. annulata and T. bruni, C. cephalonica was a preferential host. However, based on flight capacity, T. bruni did not demonstrate adaptive potential along the evaluated generations in all the 3 factitious hosts. The other species presented adaptive potential to their preferential hosts. Based on all the evaluated parameters, S. cerealella was the worst host for all the 3 parasitoid species studied. In vitro rearing of T. atopovirilia was possible from parasitism up to adult emergency on artificial diet consisting of holotissues of Heliothis virescens Fabr. (65%), egg york (18%), fetal bovine serum (8,5%), lactoalbumin hydrolysate (8,5%) and anti-contaminants (0,3%). The diet did not permit the development of T. annulata and T. bruni. The in vitro reared parasitoids presented similar characteristics to insects reared in vivo when they were transferred to factitious hosts.

ASSUNTO(S)

hospedeiro controle biológico tricogramatideo. neotropical species inseto parasitóide in vitro rearing. controle de qualidade quality control host selection

ACESSO AO ARTIGO

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