Repellency of conspecific and heterospecific larval residues to Hippodamia convergens (Coleoptera: Coccinellidae) ovipositing on sorghum plants
We examined oviposition decisions by Hippodamia convergens Guérin in semi-natural arenas in the laboratory. Gravid females were presented individually with an array of four young sorghum plants, Sorghum bicolor, bearing (1) no additional stimulus, (2) an established colony of greenbug, Schizaphis gr...
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| Format: | Article |
| Language: | English |
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Institute of Entomology, Biology Centre, Czech Academy of Science
2007-07-01
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| Series: | European Journal of Entomology |
| Subjects: | |
| Online Access: | https://www.eje.cz/artkey/eje-200703-0007_Repellency_of_conspecific_and_heterospecific_larval_residues_to_Hippodamia_convergens_Coleoptera_Coccinellida.php |
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| author | J.P. MICHAUD J.L. JYOTI |
| author_facet | J.P. MICHAUD J.L. JYOTI |
| author_sort | J.P. MICHAUD |
| collection | DOAJ |
| description | We examined oviposition decisions by Hippodamia convergens Guérin in semi-natural arenas in the laboratory. Gravid females were presented individually with an array of four young sorghum plants, Sorghum bicolor, bearing (1) no additional stimulus, (2) an established colony of greenbug, Schizaphis graminum Rondani, (3) residues of conspecific larvae, and (4) greenbugs plus residues of conspecific larvae. Females laid no egg masses on type 3 plants, significantly fewer than expected by chance on type 4 plants, and significantly more on type 1 plants, with type 2 plants receiving expected numbers. Females laid 50% of egg masses on elements of the arena other than the plants, especially the cage screen, suggesting that females sought to distance their eggs farther from larval residues than the spacing of plants in the arena permitted (15 cm). When the experiment was repeated with plants exposed to larvae of Coleomegilla maculata DeGeer, the repellency was weaker. Once again, clean plants were the most preferred and aphids did not increase the acceptability of plants with larval residues. Nevertheless, only 18% of egg masses occurred off the plants and larval residues did not reduce the acceptability of aphid-bearing plants as did conspecific larval residues. Simultaneous choice tests conducted with individual third instars of both species revealed that C. maculata larvae consumed H. convergens eggs as readily as conspecific eggs, but H. convergens larvae preferred conspecific eggs to those of C. maculata. We conclude that H. convergens oviposition decisions are shaped by the risks of both egg cannibalism and predation. |
| first_indexed | 2024-12-20T08:11:52Z |
| format | Article |
| id | doaj.art-b48e1da555a24bb1b76a73a74024be9f |
| institution | Directory Open Access Journal |
| issn | 1210-5759 1802-8829 |
| language | English |
| last_indexed | 2024-12-20T08:11:52Z |
| publishDate | 2007-07-01 |
| publisher | Institute of Entomology, Biology Centre, Czech Academy of Science |
| record_format | Article |
| series | European Journal of Entomology |
| spelling | doaj.art-b48e1da555a24bb1b76a73a74024be9f2022-12-21T19:47:15ZengInstitute of Entomology, Biology Centre, Czech Academy of ScienceEuropean Journal of Entomology1210-57591802-88292007-07-01104339940510.14411/eje.2007.059eje-200703-0007Repellency of conspecific and heterospecific larval residues to Hippodamia convergens (Coleoptera: Coccinellidae) ovipositing on sorghum plantsJ.P. MICHAUD0J.L. JYOTI1Department of Entomology, Kansas State University, Agricultural Research Center - Hays, 1232 240 th Ave, Hays, KS 67601, USA;Department of Entomology, Kansas State University, Agricultural Research Center - Hays, 1232 240 th Ave, Hays, KS 67601, USA;We examined oviposition decisions by Hippodamia convergens Guérin in semi-natural arenas in the laboratory. Gravid females were presented individually with an array of four young sorghum plants, Sorghum bicolor, bearing (1) no additional stimulus, (2) an established colony of greenbug, Schizaphis graminum Rondani, (3) residues of conspecific larvae, and (4) greenbugs plus residues of conspecific larvae. Females laid no egg masses on type 3 plants, significantly fewer than expected by chance on type 4 plants, and significantly more on type 1 plants, with type 2 plants receiving expected numbers. Females laid 50% of egg masses on elements of the arena other than the plants, especially the cage screen, suggesting that females sought to distance their eggs farther from larval residues than the spacing of plants in the arena permitted (15 cm). When the experiment was repeated with plants exposed to larvae of Coleomegilla maculata DeGeer, the repellency was weaker. Once again, clean plants were the most preferred and aphids did not increase the acceptability of plants with larval residues. Nevertheless, only 18% of egg masses occurred off the plants and larval residues did not reduce the acceptability of aphid-bearing plants as did conspecific larval residues. Simultaneous choice tests conducted with individual third instars of both species revealed that C. maculata larvae consumed H. convergens eggs as readily as conspecific eggs, but H. convergens larvae preferred conspecific eggs to those of C. maculata. We conclude that H. convergens oviposition decisions are shaped by the risks of both egg cannibalism and predation.https://www.eje.cz/artkey/eje-200703-0007_Repellency_of_conspecific_and_heterospecific_larval_residues_to_Hippodamia_convergens_Coleoptera_Coccinellida.phpcoccinellidaecannibalismhippodamia convergenscoleomegilla maculatadeterrencelarval residuesintraguild predationovipositionschizaphis graminumsorghum bicolor |
| spellingShingle | J.P. MICHAUD J.L. JYOTI Repellency of conspecific and heterospecific larval residues to Hippodamia convergens (Coleoptera: Coccinellidae) ovipositing on sorghum plants European Journal of Entomology coccinellidae cannibalism hippodamia convergens coleomegilla maculata deterrence larval residues intraguild predation oviposition schizaphis graminum sorghum bicolor |
| title | Repellency of conspecific and heterospecific larval residues to Hippodamia convergens (Coleoptera: Coccinellidae) ovipositing on sorghum plants |
| title_full | Repellency of conspecific and heterospecific larval residues to Hippodamia convergens (Coleoptera: Coccinellidae) ovipositing on sorghum plants |
| title_fullStr | Repellency of conspecific and heterospecific larval residues to Hippodamia convergens (Coleoptera: Coccinellidae) ovipositing on sorghum plants |
| title_full_unstemmed | Repellency of conspecific and heterospecific larval residues to Hippodamia convergens (Coleoptera: Coccinellidae) ovipositing on sorghum plants |
| title_short | Repellency of conspecific and heterospecific larval residues to Hippodamia convergens (Coleoptera: Coccinellidae) ovipositing on sorghum plants |
| title_sort | repellency of conspecific and heterospecific larval residues to hippodamia convergens coleoptera coccinellidae ovipositing on sorghum plants |
| topic | coccinellidae cannibalism hippodamia convergens coleomegilla maculata deterrence larval residues intraguild predation oviposition schizaphis graminum sorghum bicolor |
| url | https://www.eje.cz/artkey/eje-200703-0007_Repellency_of_conspecific_and_heterospecific_larval_residues_to_Hippodamia_convergens_Coleoptera_Coccinellida.php |
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