Diet preference of the different life stages of the aquatic grasshopper Cornops aquaticum (Orthoptera: Acrididae) and its implications for the biológica! control of water hyacinth

Host specificity determination of weed biological control agents has historically relied on evidence generated through quarantine trials in the region of introduction. These trials are conservative and where possible, more research should be conducted in the region of origin. The oligophagous, semia...

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Autores principales: Franceschini, María Celeste, Hill, Martin, Fuentes Rodríguez, Daniela, Gervazoni, Paula Belén, Sabater, Lara Milena, Coetzee, Julie Angela
Formato: Congreso
Lenguaje:Inglés
Publicado: Universidad Nacional de La Plata 2024
Materias:
Insects
Entomology
Grasshopper
Herbivore species
Orthoptera
Acceso en línea:http://repositorio.unne.edu.ar/handle/123456789/55321
Aporte de:
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) de Universidad Nacional del Nordeste
id I48-R184-123456789-55321
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spelling I48-R184-123456789-553212025-03-06T11:20:28Z Diet preference of the different life stages of the aquatic grasshopper Cornops aquaticum (Orthoptera: Acrididae) and its implications for the biológica! control of water hyacinth Franceschini, María Celeste Hill, Martin Fuentes Rodríguez, Daniela Gervazoni, Paula Belén Sabater, Lara Milena Coetzee, Julie Angela Insects Entomology Grasshopper Herbivore species Orthoptera Host specificity determination of weed biological control agents has historically relied on evidence generated through quarantine trials in the region of introduction. These trials are conservative and where possible, more research should be conducted in the region of origin. The oligophagous, semiaquatic grasshopper, Cornops aquaticum (Orthoptera: Acrididae), was released in South Africa for the biological control of Pontederia crassipes (Pontederiaceae). We conducted post-release laboratory no-choice trials, using early instar nymphs (instar I and II), later instar nymphs (instar III to VI), adult females and males, to determine fundamental host range; and gut analysis from field collected C. aquaticum to determine the ecological host range of this insect. In no-choice trials, survival rates of C. aquaticum were similar on Pistia stratiotes (Araceae), Oxycaryum cubense (Cyperaceae) and P crassipes for later stage nymphs and adults. However, under field conditions, P crassipes and the congeneric P azurea, were the only plant contents in the guts of early instar nymphs and the most abundant ones in later instar nymphs and adults. The results support the evidence that C. aquaticum is an oligophagous insect in the genus Pontederia, and that life stages should be considered when conducting host-specificity trials in externally feeding herbivore species. Diet composition of field-collected insects thus provides a better indicator of the field host range. 2024-09-16T11:19:55Z 2024-09-16T11:19:55Z 2022-10 Congreso Franceschini, María Celeste, et al., 2022. Diet preference of the different life stages of the aquatic grasshopper Cornops aquaticum (Orthoptera: Acrididae) and its implications for the biológica! control of water hyacinth. En: XI Congreso Argentino. XII Congreso Latinoamericano de Entomología. La Plata: Universidad Nacional de La Plata, p. 569-569. 2953-4178 http://repositorio.unne.edu.ar/handle/123456789/55321 eng openAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ application/pdf p. 569-569 application/pdf Universidad Nacional de La Plata
institution Universidad Nacional del Nordeste
institution_str I-48
repository_str R-184
collection RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE)
language Inglés
topic Insects
Entomology
Grasshopper
Herbivore species
Orthoptera
spellingShingle Insects
Entomology
Grasshopper
Herbivore species
Orthoptera
Franceschini, María Celeste
Hill, Martin
Fuentes Rodríguez, Daniela
Gervazoni, Paula Belén
Sabater, Lara Milena
Coetzee, Julie Angela
Diet preference of the different life stages of the aquatic grasshopper Cornops aquaticum (Orthoptera: Acrididae) and its implications for the biológica! control of water hyacinth
topic_facet Insects
Entomology
Grasshopper
Herbivore species
Orthoptera
description Host specificity determination of weed biological control agents has historically relied on evidence generated through quarantine trials in the region of introduction. These trials are conservative and where possible, more research should be conducted in the region of origin. The oligophagous, semiaquatic grasshopper, Cornops aquaticum (Orthoptera: Acrididae), was released in South Africa for the biological control of Pontederia crassipes (Pontederiaceae). We conducted post-release laboratory no-choice trials, using early instar nymphs (instar I and II), later instar nymphs (instar III to VI), adult females and males, to determine fundamental host range; and gut analysis from field collected C. aquaticum to determine the ecological host range of this insect. In no-choice trials, survival rates of C. aquaticum were similar on Pistia stratiotes (Araceae), Oxycaryum cubense (Cyperaceae) and P crassipes for later stage nymphs and adults. However, under field conditions, P crassipes and the congeneric P azurea, were the only plant contents in the guts of early instar nymphs and the most abundant ones in later instar nymphs and adults. The results support the evidence that C. aquaticum is an oligophagous insect in the genus Pontederia, and that life stages should be considered when conducting host-specificity trials in externally feeding herbivore species. Diet composition of field-collected insects thus provides a better indicator of the field host range.
format Congreso
author Franceschini, María Celeste
Hill, Martin
Fuentes Rodríguez, Daniela
Gervazoni, Paula Belén
Sabater, Lara Milena
Coetzee, Julie Angela
author_facet Franceschini, María Celeste
Hill, Martin
Fuentes Rodríguez, Daniela
Gervazoni, Paula Belén
Sabater, Lara Milena
Coetzee, Julie Angela
author_sort Franceschini, María Celeste
title Diet preference of the different life stages of the aquatic grasshopper Cornops aquaticum (Orthoptera: Acrididae) and its implications for the biológica! control of water hyacinth
title_short Diet preference of the different life stages of the aquatic grasshopper Cornops aquaticum (Orthoptera: Acrididae) and its implications for the biológica! control of water hyacinth
title_full Diet preference of the different life stages of the aquatic grasshopper Cornops aquaticum (Orthoptera: Acrididae) and its implications for the biológica! control of water hyacinth
title_fullStr Diet preference of the different life stages of the aquatic grasshopper Cornops aquaticum (Orthoptera: Acrididae) and its implications for the biológica! control of water hyacinth
title_full_unstemmed Diet preference of the different life stages of the aquatic grasshopper Cornops aquaticum (Orthoptera: Acrididae) and its implications for the biológica! control of water hyacinth
title_sort diet preference of the different life stages of the aquatic grasshopper cornops aquaticum (orthoptera: acrididae) and its implications for the biológica! control of water hyacinth
publisher Universidad Nacional de La Plata
publishDate 2024
url http://repositorio.unne.edu.ar/handle/123456789/55321
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