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Interactions between Meteorus pulchricornis and Spodoptera exigua multiple nucleopolyhedrovirus.

Guo HF, Fang JC, Zhong WF, Liu BS - J. Insect Sci. (2013)

Bottom Line: Regarding the impact of SeMNPV on M. pulchricornis, exposing the host to the parasitoid and SeMNPV with concentrations lower than 10(6) occlusion bodies (OBs)/mL produced no negative effects on the parasitoid.The results also showed that ingestion of SeMNPV by adult stage M. pulchricornis significantly increased the number of parasitoid offspring that successfully emerged from the host.Furthermore, M. pulchricornis was found to transmit SeMNPV among populations of S. exigua.

View Article: PubMed Central - PubMed

Affiliation: Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China. guohf@jaas.ac.cn

ABSTRACT
Baculoviruses may interact with parasitoids in the same host. A previous study has shown that infection of larvae with Spodoptera litura nucleopolyhedrovirus (SpltNPV) was deleterious to the survival and development of Meteorus pulchricornis (Wesmael) (Hymenoptera: Braconidae). In this paper, the interactions between M. pulchricornis and Spodoptera exigua multiple nucleopolyhedrovirus (SeMNPV) in Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae), a permissive host of the virus and parasitoid, were investigated. The results showed that the effect of M. pulchricornis on SeMNPV and the effect of the virus on the parasitoid both depended on the concentration of the virus and the interval between viral infection and parasitism. Whether S. exigua was treated with the parasitoid and virus simultaneously or 1 day apart, the biological activities of 10(5), 10(6), and 10(7) OBs/mL SeMNPV were all significantly improved by M. pulchricornis. In contrast, the biological activity of 10(3) OBs/mL SeMNPV was significantly decreased when the host was exposed to the virus and parasitoid simultaneously. Regarding the impact of SeMNPV on M. pulchricornis, exposing the host to the parasitoid and SeMNPV with concentrations lower than 10(6) occlusion bodies (OBs)/mL produced no negative effects on the parasitoid. The results also showed that ingestion of SeMNPV by adult stage M. pulchricornis significantly increased the number of parasitoid offspring that successfully emerged from the host. Furthermore, M. pulchricornis was found to transmit SeMNPV among populations of S. exigua. Taken together, these findings indicate that M. pulchricornis integrated with an appropriate concentration of SeMNPV has the potential to improve the efficacy of biological control against S. exigua.

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Number of offspring that successfully emerged from the host, produced by Meteorus pulchricornis fed a honey solution containing the virus. Each column represents the average of results from three bioassays using 6 parasitoids per bioassay. High quality figures are available online.
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f06_01: Number of offspring that successfully emerged from the host, produced by Meteorus pulchricornis fed a honey solution containing the virus. Each column represents the average of results from three bioassays using 6 parasitoids per bioassay. High quality figures are available online.

Mentions: Ingestion of SeMNPV by adult-stage M. pulchricornis also affected the successful emergence of parasitoid offspring (Figure 6); 1 and 2 days post-ingestion, the average number of offspring that emerged from the host, per parasitoid that ingested the virus, was significantly higher than the control average. No significant difference in the number of cocoons was observed at 3 and 4 days post-ingestion (F = 51.364, df = 7,23, p < 0.0001) (Figure 6).


Interactions between Meteorus pulchricornis and Spodoptera exigua multiple nucleopolyhedrovirus.

Guo HF, Fang JC, Zhong WF, Liu BS - J. Insect Sci. (2013)

Number of offspring that successfully emerged from the host, produced by Meteorus pulchricornis fed a honey solution containing the virus. Each column represents the average of results from three bioassays using 6 parasitoids per bioassay. High quality figures are available online.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3735115&req=5

f06_01: Number of offspring that successfully emerged from the host, produced by Meteorus pulchricornis fed a honey solution containing the virus. Each column represents the average of results from three bioassays using 6 parasitoids per bioassay. High quality figures are available online.
Mentions: Ingestion of SeMNPV by adult-stage M. pulchricornis also affected the successful emergence of parasitoid offspring (Figure 6); 1 and 2 days post-ingestion, the average number of offspring that emerged from the host, per parasitoid that ingested the virus, was significantly higher than the control average. No significant difference in the number of cocoons was observed at 3 and 4 days post-ingestion (F = 51.364, df = 7,23, p < 0.0001) (Figure 6).

Bottom Line: Regarding the impact of SeMNPV on M. pulchricornis, exposing the host to the parasitoid and SeMNPV with concentrations lower than 10(6) occlusion bodies (OBs)/mL produced no negative effects on the parasitoid.The results also showed that ingestion of SeMNPV by adult stage M. pulchricornis significantly increased the number of parasitoid offspring that successfully emerged from the host.Furthermore, M. pulchricornis was found to transmit SeMNPV among populations of S. exigua.

View Article: PubMed Central - PubMed

Affiliation: Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China. guohf@jaas.ac.cn

ABSTRACT
Baculoviruses may interact with parasitoids in the same host. A previous study has shown that infection of larvae with Spodoptera litura nucleopolyhedrovirus (SpltNPV) was deleterious to the survival and development of Meteorus pulchricornis (Wesmael) (Hymenoptera: Braconidae). In this paper, the interactions between M. pulchricornis and Spodoptera exigua multiple nucleopolyhedrovirus (SeMNPV) in Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae), a permissive host of the virus and parasitoid, were investigated. The results showed that the effect of M. pulchricornis on SeMNPV and the effect of the virus on the parasitoid both depended on the concentration of the virus and the interval between viral infection and parasitism. Whether S. exigua was treated with the parasitoid and virus simultaneously or 1 day apart, the biological activities of 10(5), 10(6), and 10(7) OBs/mL SeMNPV were all significantly improved by M. pulchricornis. In contrast, the biological activity of 10(3) OBs/mL SeMNPV was significantly decreased when the host was exposed to the virus and parasitoid simultaneously. Regarding the impact of SeMNPV on M. pulchricornis, exposing the host to the parasitoid and SeMNPV with concentrations lower than 10(6) occlusion bodies (OBs)/mL produced no negative effects on the parasitoid. The results also showed that ingestion of SeMNPV by adult stage M. pulchricornis significantly increased the number of parasitoid offspring that successfully emerged from the host. Furthermore, M. pulchricornis was found to transmit SeMNPV among populations of S. exigua. Taken together, these findings indicate that M. pulchricornis integrated with an appropriate concentration of SeMNPV has the potential to improve the efficacy of biological control against S. exigua.

Show MeSH
Related in: MedlinePlus