Efficacy of Heterorhabditis baujardi LPP7 (Nematoda: Rhabditida) applied in Galleria mellonella (Lepidoptera: Pyralidae) insect cadavers to Conotrachelus psidii, (Coleoptera: Curculionidae) larvae

The guava weevil, Conotrachelus psidii, is a major pest of guava in Brazil causing severe reduction in fruit quality. We assessed its susceptibility to Heterhorhabditis baujardi LPP7 infective juveniles (IJs) in the greenhouse and under field conditions applying the nematodes in cadavers of seventh...

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Bibliographic Details
Published in:Biocontrol science and technology 2008, Vol.18 (1-2), p.33-41
Main Authors: Valle, E.E. del, Dolinski , C, Barreto, E.L.S, Souza, R.M, Samuels, R.I
Format: Article
Language:English
Subjects:
application methods
application rate
biological control
biological control agents
Coleoptera
Conotrachelus
Conotrachelus pisidii
Curculionidae
dead animals
dead insects
entomopathogenic nematode
entomopathogenic nematodes
field experimentation
Galleria mellonella
Galleria mellonella cadavers
guava weevil
guavas
Heterorhabditis
Heterorhabditis baujardi
insect pests
instars
larvae
Lepidoptera
Nematoda
plant pests
Psidium guajava
Pyralidae
Rhabditida
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Summary:The guava weevil, Conotrachelus psidii, is a major pest of guava in Brazil causing severe reduction in fruit quality. We assessed its susceptibility to Heterhorhabditis baujardi LPP7 infective juveniles (IJs) in the greenhouse and under field conditions applying the nematodes in cadavers of seventh instar Galleria mellonella larvae. Field persistence of these nematodes in the soil was evaluated through G. mellonella-baiting. Insect cadaver concentrations of 2, 4 and 6 applied in pots in the greenhouse experiment caused significant mortality compared to the control. Significance differences were observed in the field between control and treatments only when six cadavers per 0.25 m2 were applied. Infective juveniles from the cadavers persisted 6 weeks after application in the field, but decreased greatly thereafter. Our work demonstrates that H. baujardi LPP7 IJs emerging from G. mellonella cadavers can be efficacious against guava weevil fourth instar larvae. Also, we demonstrated the long-term persistence of IJs in the soil.
ISSN:0958-3157
1360-0478
DOI:10.1080/09583150701721713