Survival of the mirid Eccritotarsus catarinensis as influenced by Neochetina eichhorniae and Neochetina bruchi feeding scars on leaves of water hyacinth Eichhornia crassipes

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

doi:10.1007/s10526-006-9029-1

Cited by 12 publications

(10 citation statements)

References 16 publications

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“…Among around 30 countries these weevils have been successfully utilized to control water hyacinth due to their host specific nature and effectiveness (Center et al, 2002;Firehun et al, 2015). Their significant results were reported in Egypt, Benin, Mexico, Edko lakes, Uganda, Kenyan and Tanzanian shores of Lake Victoria (Aguilar et al, 2003;Ajuonu et al, 2003;Cilliers et al, 2003;Mallya et al, 2000;Ochiel et al, 2001;Ogwang and Molo, 2004). In order to control the E. crassipes biomass accumulation in Chittar river the present study was conducted using bio control weevils N. bruchi, and N. eichhorniae.…”

Section: Introductionmentioning

confidence: 99%

Impact of release of Neochetina spp. on growth and density of water hyacinth Eichhornia crassipes

Sivaraman

Murugesan

2017

JBC

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Water hyacinth (Eichhornia crassipes) is an invasive aquatic macrophyte which creates several problems in irrigation system of rivers. To control their rapid distribution in water bodies the biological control method was carried by employing weevils Neochetina bruchi and Neochetina eichhorniae on river based field trial. The study demonstrates effectiveness of biocontrol weevil open field release on experimental site (Chittar river). When compared to first release in field, the weevil intensity was increased in numbers. Active scraping was observed in the leaves and decay spots were seen in the stems of weed. Both N. bruchi and N. eichhorniae (250 No) were introduced biyearly at experimental site for one year. During these two years of observation period, stunted growth and reduced population were observed in the study site. The study highlights importance of Neochetina spp. on the management of E. crassipes.

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Section: Introductionmentioning

confidence: 99%

Impact of release of Neochetina spp. on growth and density of water hyacinth Eichhornia crassipes

Sivaraman

Murugesan

2017

JBC

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“…Evaluation of the effectiveness of the weevils was made using plastic basins following the method of the International Institute of Tropical Agriculture (Van Thielen et al, 1994;Ajuonu et al, 2007). A total of 48 plots, each consisting of four plastic basins (0.5 m diameter and 0.30 m height) were used to raise the water hyacinth plants.…”

Section: Mottled Water Hyacinth Weevils (Single Density) Effectivenesmentioning

confidence: 99%

“…Accordingly, several insect bioagents have been imported into Africa to be used as classical bioagents against the weed (Cilliers et al, 2003;Ajuonu et al, 2007;Coetzee et al, 2011;Tipping et al, 2014). Among these insect bioagents released worldwide, two weevils, Neochetina eichhorniae (Warner) and N. bruchi Hustache (Coleoptera: Curculionidae) have been proven to be most effective (DeLoach and Cordo, 1976b;Center and Van, 1989;Center et al, 1999b).…”

Section: Introductionmentioning

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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“…Adult weevils N. eichhorniae, were collected from a field population on the Sô River (06°40.07 N, 002°24.59 E). The mirids E. catarinensis, were reared in the laboratory (Ajuonu et al 2007). …”

Section: Rearing Plants and Insectsmentioning

confidence: 99%

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

Ajuonu¹,

Byrne

Hill

et al. 2008

BioControl

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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 Abstract We assessed the effect of two biological control agents, the mirid Eccritotarsus catarinensis (Carvalho) and the weevil Neochetina eichhorniae (Warner), singly or in combination, on the competitive ability of their host plant, water hyacinth, Eichhornia crassipes (Mart.) Solms-Laub., grown in a screen house, in competition with another aquatic plant (Pistia stratiotes L.). Water hyacinth plant growth characteristics measured included fresh weight, leaf and petiole lengths, number of inflorescences produced, and new shoots. Without herbivory, water hyacinth was 18 times more competitive than water lettuce (across all experimental combinations of initial plant densities), as estimated from fresh weights. Both insect species, singly or in combination, reduced water hyacinth plant growth characteristics. E. catarinensis alone was less damaging than the weevil and under normal conditions, i.e., floating water hyacinth, is not expected to increase control of water hyacinth beyond that of the weevil. When combined with the weevil, half the inoculum of weevils and half the inoculum of mirids produced the same growth reduction as the full inoculum of the weevil. Under conditions where the weevils are not effective because water hyacinths are seasonally rooted in mud, the mirid, which lives entirely on leaves, should become a useful additional biological control agent.

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Survival of the mirid Eccritotarsus catarinensis as influenced by Neochetina eichhorniae and Neochetina bruchi feeding scars on leaves of water hyacinth Eichhornia crassipes

Cited by 12 publications

References 16 publications

Impact of release of <i>Neochetina</i> spp. on growth and density of water hyacinth <i>Eichhornia crassipes</i>

Impact of release of <i>Neochetina</i> spp. on growth and density of water hyacinth <i>Eichhornia crassipes</i>

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

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

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