Entomologia Experimentalis et Applicata (2005) 115, 227-237
Maria Carolina Blassioli Moraes, Raul Laumann, Edson R. Sujii, Carmen Pires and Miguel Borges (2005)
Induced volatiles in soybean and pigeon pea plants artificially infested with the neotropical brown stink bug, Euschistus heros, and their effect on the egg parasitoid, Telenomus podisi
Entomologia Experimentalis et Applicata 115 (1), 227-237
Abstract: Herbivory is known to increase the emission of volatiles, which attract natural enemies to herbivore-damaged plants in laboratory and agricultural systems. We report on signalling through volatiles induced by Euschistus heros (F.) (Heteroptera: Pentatomidae) in two legumes that influence the attraction and retention of the egg parasitoid Telenomus podisi (Ashmead) (Hymenoptera: Scelionidae). Air-borne extracts obtained from two host plants of E. heros, soybean, Glycine max, and pigeon pea, Cajanus cajan (Leguminosae), produce a different blend of emitted volatiles when attacked by adult males or females and nymphs of the pest species, compared with the undamaged plants. The same results were obtained when the plants were treated with extracted saliva of E. heros which had been mechanically introduced into the plants. This indicates that some substance in the saliva contributed to the release of the volatiles. Bioassays in a Y-tube olfactometer with female T. podisi and treated plants confirmed the significant preference of the egg parasitoid for plants attacked by either males, females, or fourth instar nymphs of the pest species. On the other hand, volatile extracts obtained from soybean subjected to the velvetbean caterpillar, Anticarsia gemmatalis, a non-host species for T. podisi, showed a different blend of volatiles compared to those obtained from plants subjected to E. heros. Additionally, the volatiles obtained from this plant-host complex were not attractive to T. podisi. These results indicate that E. heros causes an increase in the emission of specific plant volatiles, and that the induction is possibly caused by an elicitor present in the pest saliva. The possibility that these plant volatiles play an important role in the attraction and retention of the egg parasitoid T. podisi is discussed.
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Link to article at publishers website
Database assignments for author(s): Miguel Borges, Raúl Alberto Laumann, Edison R. Sujii, Carmen S.S. Pires
Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
environment - cropping system/rotation
Research topic(s) for beneficials or antagonists:
environment/habitat manipulation
general biology - morphology - evolution
Pest and/or beneficial records:
Beneficial | Pest/Disease/Weed | Crop/Product | Country | Quarant.
|
---|---|---|---|---|
Euschistus heros | Soybean (Glycine max) | |||
Euschistus heros | Pigeonpea (Cajanus cajan) | |||
Telenomus podisi (parasitoid) | Euschistus heros | Soybean (Glycine max) | ||
Telenomus podisi (parasitoid) | Euschistus heros | Pigeonpea (Cajanus cajan) |