SciELO - Scientific Electronic Library Online

vol.32 número4Development of Melittobia australica Girault and M. digitata Dahms (Parker) (Hymenoptera: Eulophidae) parasitizing Neobellieria bullata (Parker) (Diptera: Sarcophagidae) pupariaEffect of sodium silicate application on the resistance of wheat plants to the green-aphids Schizaphis graminum (Rond.) (Hemiptera: Aphididae) índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados




Links relacionados


Neotropical Entomology

versión impresa ISSN 1519-566Xversión On-line ISSN 1678-8052


SILVA, Valda C.A.; BARROS, Reginaldo; MARQUES, Edmilson J.  y  TORRES, Jorge B.. Susceptibility of Plutella xylostella (L.) (Lepidoptera: Plutellidae) to the fungi Beauveria bassiana (Bals.) Vuill. and Metarhizium anisopliae (Metsch.) Sorok. Neotrop. Entomol. [online]. 2003, vol.32, n.4, pp.653-658. ISSN 1519-566X.

An initial screening was undertaken using the isolates ESALQ 447, ESALQ 760, ESALQ 900, ESALQ 634, IPA-205 and ESALQ 760 of B. bassiana, and ESALQ E9, IPA-207, ESALQ 860, IPA-204 and UFPE 3027 of M. anisopliae at the concentration of 108 conidia/ml for the diamondback moth (DBM) second instar. All isolates tested caused DBM larval mortality ranging from 70% to 96%, except the M. anisopliae isolate UFPE 3027, which resulted in a mortality of 26%. Based on this survey the isolates ESALQ 634 and ESALQ 447 of B. bassiana and IPA-207 and ESALQ E9 of M. anisopliae were chosen and assessed at the concentrations 105, 106, 107 and 108 conidia/ml for DBM second instar. These selected isolates at concentrations higher than 106 conidia/ml caused DBM larval mortality ranging from 58% to 96%. The mean lethal time (LT50) for DBM second instar were 1.1 and 4.3 days, and 0.7 and 5.8 days for B. bassiana isolates ESALQ 634 and ESALQ 447 and M. anisopliae isolates IPA-207 and ESALQ E9, respectively. Based on the lethal concentrations (LC50) the isolates IPA-207 and ESALQ E9 were seven times more virulent to DBM second instar than B. bassiana isolates ESALQ 634 and ESALQ 447. These results showed that DBM larvae were more susceptible to M. anisopliae than to B. bassiana and that M. anisopliae isolates IPA-207 and ESALQ E9 may be a valuable component for the integrated management of DBM larvae.

Palabras clave : Biological control; cabbage; Brassica oleracea; diamondback moth; entomopathogenic fungus.

        · resumen en Portugués     · texto en Portugués     · Portugués ( pdf epdf )


Creative Commons License Todo el contenido de esta revista, excepto dónde está identificado, está bajo una Licencia Creative Commons