The effect of two biological control agents, the weevil Neochetina eichhorniae and the mirid Eccritotarsus catarinensis on water hyacinth, Eichhornia crassipes, grown in culture with water lettuce, Pistia stratiotes

Ajuonu, O.; Byrne, Marcus J.; Hill, Martin; Neuenschwander, Peter; Korie, Sam

doi:10.1007/s10526-008-9185-6

Cited by 15 publications

(7 citation statements)

References 16 publications

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“…The Salvini a weevil ( Cyrtobagous singularis ) has been effective in Australia [200], and several lepidopterans have been effective against milfoil ( Myriophyllum spicatum ; [201]), but large scale applications have been few and new agents and much more research are needed before the technique becomes reliable and cost-effective [202]. …”

Section: Transient Methods Of Wetlands Mosquito Controlmentioning

confidence: 99%

North American Wetlands and Mosquito Control

Rey

Walton

Wolfe

et al. 2012

IJERPH

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Wetlands are valuable habitats that provide important social, economic, and ecological services such as flood control, water quality improvement, carbon sequestration, pollutant removal, and primary/secondary production export to terrestrial and aquatic food chains. There is disagreement about the need for mosquito control in wetlands and about the techniques utilized for mosquito abatement and their impacts upon wetlands ecosystems. Mosquito control in wetlands is a complex issue influenced by numerous factors, including many hard to quantify elements such as human perceptions, cultural predispositions, and political climate. In spite of considerable progress during the last decades, habitat protection and environmentally sound habitat management still remain inextricably tied to politics and economics. Furthermore, the connections are often complex, and occur at several levels, ranging from local businesses and politicians, to national governments and multinational institutions. Education is the key to lasting wetlands conservation. Integrated mosquito abatement strategies incorporate many approaches and practicable options, as described herein, and need to be well-defined, effective, and ecologically and economically sound for the wetland type and for the mosquito species of concern. The approach will certainly differ in response to disease outbreaks caused by mosquito-vectored pathogens versus quality of life issues caused by nuisance-biting mosquitoes. In this contribution, we provide an overview of the ecological setting and context for mosquito control in wetlands, present pertinent information on wetlands mosquitoes, review the mosquito abatement options available for current wetlands managers and mosquito control professionals, and outline some necessary considerations when devising mosquito control strategies. Although the emphasis is on North American wetlands, most of the material is applicable to wetlands everywhere.

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Section: Transient Methods Of Wetlands Mosquito Controlmentioning

confidence: 99%

North American Wetlands and Mosquito Control

Rey

Walton

Wolfe

et al. 2012

IJERPH

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“…Subsequent evaluations have demonstrated that it affects water hyacinth growth (Coetzee et al, 2007) and competitive ability (Coetzee et al, 2005;Ajuonu et al, 2009), by reducing the plant's overall vigour. Eccritotarsus catarinensis has also been released in Zimbabwe, Zambia, Malawi, Benin, and China but only established in Malawi (Coetzee et al, 2009a).…”

Section: Orthogalumna Terebrantismentioning

confidence: 99%

Management of water hyacinth (Eichhornia crassipes [Mart.] Solms) using bioagents in the Rift Valley of Ethiopia

Gebregiorgis

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Management of water hyacinth (Eichhornia crassipes[This thesis presents a study on management of water hyacinth (Eichhornia crassipes [Mart.] Solms) using insects and fungal pathogens as bioagents. The main goal was to develop an effective biocontrol strategy for water hyacinth in the Rift Valley of Ethiopia. To this end, a field survey was conducted to assess the agro-ecological distribution of water hyacinth and of native fungal pathogens found in association with water hyacinth. We also performed laboratory and lath house experiments on (i) pathogenicity and host specificity of the fungal pathogens; (ii) adaptability, life table, efficacy and host specificity of the two Neochetina weevils; and (iii) the synergetic effects of integrated use of Neochetina weevils and fungal pathogen as bioagents. Survey results indicated that the weed is distributed in the Rift Valley water bodies located in low, mid and high altitude. The survey results also identified 25 fungal species found in association with water hyacinth that belonged to nine genera. Among the isolates, Alternaria alternata, A. tenuissima, and Alternaria spp. hold promise as possible bioagents of water hyacinth.Laboratory study on life cycle and development of Neochetina weevils indicated the two weevils took shorter generation time in Ethiopia than in Argentina but relatively similar to Kenya and Uganda. In Ethiopia, the two weevils produced four generations per year indicating their successful establishment. Feeding by adult weevils and tunneling by larvae significantly impacted the vigour and reproduction of water hyacinth plants. A herbivory loads of three pairs of N. bruchi and two pairs of N. eichhorniae showed the highest level of leaf damage and defoliated petioles. The study also reinforced that the two weevils are sufficiently host-specific. Finally, a study on integrated use of Neochetina weevils and an indigenous plant pathogen revealed that the two Neochetina weevils and the fungus A. alternata were together able to reduce the vegetative growth and fresh weight of water hyacinth plants considerably.This study recommends integrated use of fungal species and the two weevils to control water hyacinth. Implications of the findings are also discussed in the context of integrated water hyacinth management using the native fungal pathogens and the two weevils.

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“…In warmer regions worldwide different ways of controlling the populations of water lettuce are used including chemical and physical methods, but no reports about total local eradication could be found (Cilliers et al 1996, Diop and Hill 2009, Gherardi et al 2011. Mitigation by biological control agents could be more successful (Cilliers et al 1996, Ajuonu et al 2009, Diop and Hill 2009, Baker et al 2010, with the introduction of new competitive alien species, which might on the other hand, have additional impacts (usually negative) on native biodiversity (Lockwood et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Alien water lettuce (Pistia stratiotes L.) outcompeted native macrophytes and altered the ecological conditions of a Sava oxbow lake (SE Slovenia)

Jaklič

Koren

Jogan

2020

Acta bot. Croat. (Online)

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Introduction of an invasive alien macrophyte water lettuce (Pistia stratiotes L.) radically changed the oxbow lake in Prilipe (SE Slovenia) which has thermal springs that enables the winter survival of this tropical invader. About 10 years after the first record of P. stratiotes, the number, abundance and biomass of indigenous and non-indigenous macrophytes as well as different abiotic parameters were measured. In that period, colonized sections (~94% of the oxbow lake) were completely covered with water lettuce, and the only reservoirs of indigenous macrophyte species were the non-colonized areas (6%). Research in 2011 found only a third of the previously recorded indigenous macrophytes, but then only in small section without P. stratiotes. Three of the species that disappeared were on the Red data list. In the colonized section a higher biomass was observed than in the non-colonized section because of high abundance of water lettuce which remained the only macrophyte. Due to the presence of P. stratiotes, the intensity of light penetrating into the depth and water circulation were reduced, as was the oxygen saturation of the water. In addition to the well documented vegetative propagation of P. stratiotes, a well-established and viable seed bank has been detected in the lake sediment and after winter floods also on lake banks. In the future, special attention should be given to the thermal water ecosystems in temperate climates since they can serve as stepping stones and recruitment centres for the establishment and spread of (sub-)tropical invasive species. Facing predicted climate change such local populations of invasive species can act as stepping stones for further dispersal.

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The effect of two biological control agents, the weevil Neochetina eichhorniae and the mirid Eccritotarsus catarinensis on water hyacinth, Eichhornia crassipes, grown in culture with water lettuce, Pistia stratiotes

Cited by 15 publications

References 16 publications

North American Wetlands and Mosquito Control

North American Wetlands and Mosquito Control

Management of water hyacinth (Eichhornia crassipes [Mart.] Solms) using bioagents in the Rift Valley of Ethiopia

Alien water lettuce (Pistia stratiotes L.) outcompeted native macrophytes and altered the ecological conditions of a Sava oxbow lake (SE Slovenia)

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