Ganancia de peso del depredador Podisus distinctus (Heteroptera: Pentatomidae) en combinaciones de las presas Tenebrio molitor (Coleoptera: Tenebrionidae) y Musca domestica (Diptera: Muscidae)
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Revista de Biología Tropical
Abstract
Entre las ninfas de los asopíneos usados para el con-
trol de gusanos desfoliadores en plantaciones de eucalipto,
Podisus distinctus (Stal) (Heteroptera: Pentatomidae) re-
presenta un potencial agente de control biológico, sin em-
bargo esta especie ha sido poco estudiada. El presente
trabajo evaluó el efecto de las diferentes combinaciones de
las presas Musca domestica L. (Diptera: Muscidae) y Te-
nebrio molitor L. (Coleoptera: Tenebrionidae) sobre el pe-
so de ninfas de P. distinctus. El experimento se realizó en
laboratorio do “Instituto de Biotecnologia Aplicada à
Agropecuaria (BIOAGRO)”, a 25 ± 0.5oC, 60 ± 10% de
humedad relativa y 14 horas de fotoperiodo. Las ninfas de
P. distinctus fueron individualizadas en cajas de Petri y ali-
mentadas de acuerdo con los siguientes tratamientos: T1-
larvas de M. domestica durante toda la fase ninfal; T2- lar-
vas de M. domestica en el II estadio y de T. molitor en los
III, IV y V estadios; T3- larvas de M. domestica en el II y
III estadios y de T. molitor en los IV y V estadios; T4- lar-
vas de M. domestica en el II, III y IV estadios y de T. mo-
litor en el V estadio; T5- larvas de T. molitor en todos los
estadios. Los mejores resultados de peso y ganancia de pe-
so fueron encontrados cuando P. distinctus fue alimentado
alternadamente con larvas de M. domestica y T. molitor.
Cuando esse depredador fue solamente alimentado con lar-
vas de M. domestica, presentó pesos menores.
Litlle is known about Podisus distinctus (Stal) (Heteroptera: Pentatomidae) one of the Asopinae species with good possibilities for mass rearing and releasing against defoliator caterpillars in eucalyptus reforested areas in Brazil. We evaluated the impact of prey combinations on weight of nymphs and adults of P. distinctus. The prey were Musca domestica L. (Diptera: Muscidae) and Tenebrio molitor L. (Coleoptera: Tenebrionidae). The experiment was developed under 25 ± 0.5ºC, 60 ± 10% R.H. and photophase of 14 hr, with nymphs of P. distinctus individualized in Petri dishes and fed as: T1- larvae of M. domestica during its whole nymphal phase; T2- larvae of M. domestica during its II instar and of T. molitor during the other instars; T3- larvae of M. domestica during II and III instars and of T. molitor during the other instars; T4- larvae of M. domestica during II, III and IV instars and of T. molitor during the V instar; T5- larvae of T. molitor during all instars. P. distinctus presents lower weight when fed with larvae of M. domestica. For this reason it is recommended to feed P. distinctus with T. molitor during its whole nymphal phase or with larvae of M. domestica only during II and III instars and T. molitor during IV and V instars.
Litlle is known about Podisus distinctus (Stal) (Heteroptera: Pentatomidae) one of the Asopinae species with good possibilities for mass rearing and releasing against defoliator caterpillars in eucalyptus reforested areas in Brazil. We evaluated the impact of prey combinations on weight of nymphs and adults of P. distinctus. The prey were Musca domestica L. (Diptera: Muscidae) and Tenebrio molitor L. (Coleoptera: Tenebrionidae). The experiment was developed under 25 ± 0.5ºC, 60 ± 10% R.H. and photophase of 14 hr, with nymphs of P. distinctus individualized in Petri dishes and fed as: T1- larvae of M. domestica during its whole nymphal phase; T2- larvae of M. domestica during its II instar and of T. molitor during the other instars; T3- larvae of M. domestica during II and III instars and of T. molitor during the other instars; T4- larvae of M. domestica during II, III and IV instars and of T. molitor during the V instar; T5- larvae of T. molitor during all instars. P. distinctus presents lower weight when fed with larvae of M. domestica. For this reason it is recommended to feed P. distinctus with T. molitor during its whole nymphal phase or with larvae of M. domestica only during II and III instars and T. molitor during IV and V instars.
