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Trichogramma pretiosum parasitism and dispersal capacity: a basis for developing biological control programs for soybean caterpillars

Published online by Cambridge University Press:  15 June 2011

R.C.O. de Freitas Bueno ,
J.R.P. Parra  and
A. de Freitas Bueno
R.C.O. de Freitas Bueno
Affiliation:
Universidade de Rio Verde, FESURV, Fazenda Fontes do Saber, Caixa Postal 104. Rio Verde, Goiás, 75901-970, Brazil
J.R.P. Parra
Affiliation:
Departmento de Entomologia e Acarologia, Universidade de São Paulo, ESALQ/USP, Piracicaba, São Paulo, 13418-900, Brazil
A. de Freitas Bueno*
Affiliation:
Embrapa Soja, Caixa Postal 231, 86001-970, Londrina, Paraná, Brazil
*
*Author for correspondence Fax: +55(43)3371-6100 E-mail: [email protected]
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Abstract

In order to succeed in biological control programs, not only is it crucial to understand the number of natural enemies to be released but also on how many sites per area this releasing must be performed. These variables might differ deeply among egg parasitoid species and crops worked. Therefore, these trials were carried out to evaluate the parasitism (%) in eggs of Anticarsia gemmatalis and Pseudoplusia includens after the release of different densities of the egg parasitoid Trichogramma pretiosum. Field dispersal was also studied, in order to determine appropriate recommendations for the release of this parasitoid in soybean fields. The regression analysis between parasitism (%) and densities of the parasitoid indicated a quadratic effect for both A. gemmatalis and P. includens. The maximum parasitism within 24 h after the release was reached with densities of 25.6 and 51.2 parasitoids per host egg, respectively, for the two pests. Parasitism of T. pretiosum in eggs of P. includens decreased linearly as the distance of the pest eggs from the parasitoid release sites increased. For P. includens, the mean radius of T. pretiosum action and the area of parasitoid dispersal in the soybean crop were 8.01 m and 85.18 m2, respectively. We conclude that for a successful biological control program of lepidopteran pests using T. pretiosum in soybean fields, a density of 25.6 parasitoids per host egg, divided into 117 sites per hectare, should be used.

Keywords

egg parasitoidTrichogrammatidaesoybean loopervelvetbean caterpillarparasitoid release
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 102 , Issue 1 , February 2012 , pp. 1 - 8
Copyright
Copyright © Cambridge University Press 2011

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