Topic
Cyrtobagous salviniae
About: Cyrtobagous salviniae is a research topic. Over the lifetime, 99 publications have been published within this topic receiving 2192 citations.
Papers published on a yearly basis
Papers
TL;DR: Water chemical analyses for dissolved substances give no evidence that nutrients in the Sepik River and ‘lagoons’ might become limiting enough to affect the Salvinia population.
Abstract: Since 1977 the Sepik River backwaters between Pagwi and Angoram in Papua New Guinea have become increasingly covered by the exotic water-fern Salvinia molesta. By May 1979, Salvinia covered about 80 km2. Water chemical analyses for dissolved substances give no evidence that nutrients in the Sepik River and ‘lagoons’ might become limiting enough to affect the Salvinia population. The physical impact of the plant is reflected especially in the decline of the fisheries for Saltfish Tilapia (Sarotherodon mossambicus), crocodile hunting, collection of sago-palm, and in the slowing down or complete elimination of water transport. As a consequence, people in a number of villages are unable to reach markets and children cannot go to schools.A programme of management has been formulated which will involve the United Nations, central and provincial governments, and local inhabitants. However, it should be understood that there is little chance of complete elimination of the weed from Sepik River backwaters.
71 citations
TL;DR: The recent introduction and establishment of C. salviniae in South Africa is described, and the future management of S. molesta is discussed.
61 citations
TL;DR: Larvae of a salvinia weevil spent from 1–4 days browsing on the roots and from 0–9 days in the buds of the host plant, Salvinia molesta, prior to tunnelling into the rhizome of this aquatic weed.
Abstract: Newly-emerged larvae of a salvinia weevil, Cyrtobagous sp. spent from 1–4 days browsing on the roots and from 0–9 days in the buds of the host plant, Salvinia molesta, prior to tunnelling into the rhizome of this aquatic weed. Although larvae were able to survive up to 38 days browsing on roots when rhizomes were withheld, they were unable to complete development.
After tunnelling began, larval development between 21° and 31° was dependent on temperature and nitrogen levels in the host. Larvae failed to develop at 17°. High nutritional intake by the larvae reduced larval development time but did not influence duration of their subsequent pupal development.
The feeding sites and plant damage produced by individual larvae were assessed.
RESUME
Caracteristiques alimentaires et developpement larvaires de Cyrtobagous sp. (Col.: Curcul.) sur Salvinia
Apres leur naissance, les larves de Cyrtobagous sp. passent de 1 a 4 jours a brouter les racines, et de 0 a 9 jours dans les bourgeons de la plante hote, Salvinia molesta, avant d'y creuser une galerie dans le rhizome. Bien que les larves aient ete capables de survivre jusqu'a 38 jours en broutant les racines, quant elles furent privees de rhizome, elle ne purent achever leur developpement.
Quand les galeries furent commencees, le developpement larvaire, entre 21° et 31°, dependit de la temperature et de la teneur en azote de l'hote. Les larves ne se developperent pas a 17°. Une haute valeur nutritive de l'aliment consomme par les larves reduisit la duree du developpement, mais n'influenca pas la duree ulterieure de leur developpement nymphal.
Les lieux de prise de nourriture et les degâts produits par des larves isolees furent precises.
59 citations
TL;DR: More than 1700 samples of Salvinia molesta Mitchell were collected from sites distributed from close to the equator in Papua New Guinea to 33°S in Australia, and the results showed that N and P contents were inversely correlated with temperature, probably due to greater growth and utilisation of nutrients in summer as mentioned in this paper.
59 citations
TL;DR: Within a few years of releases, control of water fern and water lettuce was such that fishing and navigation could be resumed, while reductions of water hyacinth populations were only beginning.
Abstract: Since 1999, four specific weevils (Coleoptera, Curculionidae) were released in the Republic of Congo against three exotic floating water weeds: Neochetina eichhorniae Warner and N. bruchi Hustache against water hyacinth, Neohydronomus affinis Hustache against water lettuce, and Cyrtobagous salviniae Calder and Sands against water fern. Recoveries of exotic weevils were made from all 24 release sites except one, and all four species have established and spread (up to 800 km for water hyacinth weevils). Within a few years of releases, control of water fern and water lettuce was such that fishing and navigation could be resumed, while reductions of water hyacinth populations were only beginning.
47 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 1 |
| 2020 | 3 |
| 2019 | 3 |
| 2018 | 3 |
| 2017 | 5 |
| 2016 | 1 |