RESÚMEN DE TESIS

 

 

ENCYRTIDS ASSOCIATED TO PSEUDOCOCCIDS, SELECTION AND REARING METHOD OF BIOLOGICAL CONTROL AGENT

Margarita R. Ceballos Vázquez

Centro Nacional de Sanidad Agropecuaria (CENSA). Autopista Nacional y Carretera de Jamaica. San José de las Lajas. La Habana. Cuba. E-mail: [e-mail]

Date: january 26 ^th, 2006

The recognition of Encyrtidae family species and the development of a methodology for the mass reproduction of the most promissory one in the pseudococcid management, will allow providing new biological control agents as a safe environmental alternative. In the present study, the identification of encyrtids associated to pseudococcid species was carried out in cultivations and plants of economical importance in the western, central and eastern regions of the country. Three new genera: Leptomastix Föster, Coccidoxenoides Girault and Neodusmetia Kerrich and 14 species were identified; eight of the species are new reports for the country. A key for the identification of Tetracneminae and Encyrtinae sub-family genera present in Cuba was elaborated. Field studies of parasitoidism percentage, frequency and relative abundance of the present species were carried out. A multiple attribute Heuristic method was applied for the parasitoid selection. Among them, the highest value in the additive model was found for Leptomastix dactylopii Howard, which allowed the selection of this species to evaluate its biological behaviour in our conditions. In the biological studies, L. dactylopii reached a fecundity average of 31,6 ± 3.15 eggs/female on Planococcus minor Maskell, a mean development cycle of 17,1 ± 0,9 days and an average life cycle of 41,3 ± 4,3 days; and it was demonstrated that it has a type II functional response. Starting from these results, L. dactylopii was selected and a methodology for its mass reproduction was elaborated. Quality indicators for the species under the breeding conditions were studied and the methodology was introduced in the Plant Health Provincial Laboratories and in two scientific institutions. The results of the introduction were validated by a survey with satisfactory results, which facilitates that L. dactylopii could be used as a pseudococcid biological control agent using conservation or increasing strategies in emergent or introduced pests.