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| DOI: | 10.1016/S1049-9644(03)00119-1 |
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| Web URL(s): | http://www.sciencedirect.com/science/article/pii/S1049964403001191
Last checked: 01/31/2014
Access conditions: Item is within a limited-access website |
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| Publication Type:
| Refereed |
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| Author(s): | Kunkel, Brian A.;
Grewal, P. S.;
Quigley, M. F. |
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| Author Affiliation: | Kunkel and Grewal: Department of Entomology, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster, Ohio; Quigley: Department of Horticulture and Crop Science, The Ohio State University, Columbus, Ohio |
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| Title: | A mechanism of aquired resistance against an entomopathogenic nematode by Agrotis ipsilon feeding on perennial ryegrass harboring a fungal endopyte |
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| Source: | Biological Control: Theory and Application in Pest Management. Vol. 29, No. 1, January 2004, p. 100-108. |
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| Publishing Information: | San Diego: Academic Press |
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| # of Pages: | 9 |
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| Keywords: | TIC Keywords: Agrotis ipsilon; Lolium perenne; Entomopathogenic nematodes; Steinernema carpocapsae; Peramine; Ergovaline; Lolitrem; Ergotamine; Beauveria bassiana; Metarhizium anisopliae; Biological control; Biological insecticides
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| Abstract/Contents: | "Perennial ryegrass forms a symbiotic relationship with the fungus Neotyphodium lolii, which provides many benefits including resistance to herbivory through the production of alkaloids. The impact of endophytic grass on the third trophic level has received little attention. The black cutworm, Agrotis ipsilon, is less susceptible to the entomopathogenic nematode, Steinernema carpocapsae, when it consumes the endophytic grass. We examined the potential mechanisms of the resistance exhibited by A. ipsilon against S. carpocapsae. Although A. ipsilon larvae fed on endophytic grass had similar numbers of nematodes attached and that successfully developed into adults, they had significantly lower mortality than larvae fed on endophyte-free grass when exposed to nematodes for 1.5 h. We examined the effects of N. lolii produced ergot alkaloids, ergotamine tartrate, ergonovine maleate, ergocryptine, and erogcristine on nematode viability and infectivity. Ergonovine malate increased and ergocristine decreased the rates of nematode infectivity, whereas other treatments had no significant effect. We also investigated the effects of ergocristine on Xenorhabdus nematophila, the symbiotic bacterium of S. carpocapsae. Bacterial growth and pathogenicity were significantly reduced when the bacterium was grown in nutrient broth containing 200 μ g/ml concentration of ergocristine. We conclude that herbivores capable of developing on endophytic grasses may acquire some level of resistance against S. carpocapsae due to the toxic effects of ergocristine on the bacterium, X. nematophila. Our results underscore the ability of N. lolii to affect trophic interactions through the production of alkaloids." |
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| Language: | English |
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| References: | 50 |
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| Note: | Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Kunkel, B. A., P. S. Grewal, and M. F. Quigley. 2004. A mechanism of aquired resistance against an entomopathogenic nematode by Agrotis ipsilon feeding on perennial ryegrass harboring a fungal endopyte. Biol. Control: Theory Appl. Pest Manage. 29(1):p. 100-108. |
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| DOI: 10.1016/S1049-9644(03)00119-1 |
| Web URL(s):
http://www.sciencedirect.com/science/article/pii/S1049964403001191
Last checked: 01/31/2014
Access conditions: Item is within a limited-access website |
| 
MSU catalog number: SB 925 .B5 |
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