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| Titel: |
Efficacy of Spodoptera exigua multiple nucleopolyhedrovirus as a biological insecticide for beet armyworm control in greenhouses of southern Spain |
| Auteur: |
Lasa, Rodrigo Pagola, Inaki ibanez, Itxaso Belda, Jose E. Williams, Trevor Caballero, Primitivo |
| Verschenen in: |
Biocontrol science and technology |
| Paginering: | Jaargang 17 (2007) nr. 3 pagina's 221-232 |
| Jaar: |
2007 |
| Inhoud: |
Chemical control measures targeted at Spodoptera exigua in greenhouse sweet pepper crops in Spain have resulted in pest resistance to virtually all commercially available insecticidal products. A multicapsid nucleopolyhedrovirus (SeMNPV), isolated from diseased S. exigua in Spain, was produced in laboratory reared larvae, tested for insecticidal activity in a laboratory bioassay, and was then applied in eleven commercial greenhouses planted with sweet pepper. Virus occlusion bodies (OBs) were applied on two occasions, at an interval of ∼7 days, at a rate of 5×108 OBs/L of spray in a volume of ∼600 L/ha, depending on crop phenology and greenhouse area. The percentage of plants showing recent (<48 h old) feeding damage fell dramatically in greenhouses with high infestations of S. exigua; the same pattern was observed, although less dramatically, in greenhouses with low infestations. Average mortality of larvae collected from treated plants at 4 days after each application, and reared in the laboratory until death, was high (70-89%) and was not significantly affected by the degree of crop infestation. In a separate trial, the rate of acquisition of infection was examined in larvae that fed on plants treated with 1×108 or 5×108 OBs/L of spray. Of the 27 and 60% of larvae, respectively, that acquired infection in the 48 h period after spraying, about half became infected in the first 6 h post-application, irrespective of application rate. Acquisition of infection proceeded more slowly during the night-time compared to the daytime period, underlining the advantages of early morning applications of the virus. We conclude that the Spanish SeMNPV isolate merits registration as a biological insecticide for use in greenhouse crops in this region. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 6 van 10 gevonden artikelen
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