The possibilities of a positive or negative impact the biocontrol agents may have on each other as well as on the control of the weed itself, inspired us to study the interactions between the mirid, Eccritotarsus catarinensis and the phytopathogen, Acremonium zonatum, biocontrol agents of water hyacinth, Eichhornia crassipes.The mirid, Eccritotarsus catarinensis, was released in South Africa to aid in the biological control of waterhyacinth ( Eichhornia crassipes). Post-release evaluations are needed to quantify the mirid’s impact on the weed in South Africa. The subtle feeding damage that it causes is not easily measured, but studies have shown that interactions with other plant stresses, e.g., plant competition, can often magnify impacts of plant-feeding insects.
Biocontrol Agents Against Eichhornia Crassipes Free Of Herbivory
South Africa has some of the most eutrophic aquatic systems in the world, as a result of the adoption of an unnecessarily high 1 mg l1 phosphorus (P) standard for all water treatment works in the 1970 s. This insect is unlikely to be an effective agent by itself, but it will be a useful complement to the existing biological control agents in South Africa.Additionally, the effect of dehydration periods on the sporulation of mycelial biomass at 24, 48, 72, 96 and 120 h was evaluated. The obtained inocula were evaluated according to the severity of the disease on water hyacinth (Eichhornia crassipes) plants. Competitive abilities of waterlettuce and waterhyacinth were determined using an inverse linear model with plant weight as the yield variable. In the absence of herbivory, waterhyacinth was 23 times more competitive than waterlettuce, but only 10 times more competitive when exposed to mirid feeding. Waterlettuce was only 0.9 times as aggressive as waterhyacinth that was free of herbivory, but 1.5 times as competitive when mirids were impacting waterhyacinth.
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. The main goal was to develop an effective biocontrol strategy for water hyacinth in the Rift Valley of Ethiopia. It is.This thesis presents a study on management of water hyacinth ( Eichhornia crassipes Solms) using insects and fungal pathogens as bioagents. Eichhorniae are expected to help resolve the biological control potential of this rust fungus in the near future. Ongoing studies on the biology of U.
Tenuissima, and Alternaria spp. Among the isolates, Alternaria alternata, A. The survey results also identified 25 fungal species found in association with water hyacinth that belonged to nine genera. Survey results indicated that the weed is distributed in the Rift Valley water bodies located in low, mid and high altitude.
In Ethiopia, the two weevils produced four generations per year indicating their successful establishment. To this end, a field survey was conducted to assess the agro-ecologicalLaboratory 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. The main goal was to develop an effective biocontrol strategy for water hyacinth in the Rift Valley of Ethiopia. Solms) using insects and fungal pathogens as bioagents.
Alternata were together able to reduce the vegetative growth and fresh weight of water hyacinth plants considerably.Water hyacinth, Eichhornia crassipes, is an invasive aquatic plant in South Africa where seven biological control agents have been released on the weed.This study recommends integrated use of fungal species and the two weevils to control water hyacinth. Finally, a study on integrated use of Neochetina weevils and an indigenous plant pathogen revealed that the two Neochetina weevils and the fungus A. The study also reinforced that the two weevils are sufficiently host-specific. Eichhorniae showed the highest level of leaf damage and defoliated petioles. Bruchi and two pairs of N. A herbivory loads of three pairs of N.
Survey results indicated that the weed is distributed in the Rift Valley water bodies located in low, mid and high altitude. 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. 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. The main goal was to develop an effective biocontrol strategy for water hyacinth in the Rift Valley of Ethiopia.
Bruchi and two pairs of N. A herbivory loads of three pairs of N. Feeding by adult weevils and tunneling by larvae significantly impacted the vigour and reproduction of water hyacinth plants. In Ethiopia, the two weevils produced four generations per year indicating their successful establishment.
Alternata were together able to reduce the vegetative growth and fresh weight of water hyacinth plants considerably. Finally, a study on integrated use of Neochetina weevils and an indigenous plant pathogen revealed that the two Neochetina weevils and the fungus A. The study also reinforced that the two weevils are sufficiently host-specific.
Survey results indicated that the weed is distributed in the Rift Valley water bodies located in low, mid and high altitude. 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. 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. The main goal was to develop an effective biocontrol strategy for water hyacinth in the Rift Valley of Ethiopia. - With summary in EnglishN2 - This thesis presents a study on management of water hyacinth (Eichhornia crassipes Solms) using insects and fungal pathogens as bioagents. Implications of the findings are also discussed in the context of integrated water hyacinth management using the native fungal pathogens and the two weevils.",T1 - Management of water hyacinth (Eichhornia crassipes Solms) using bioagents in the Rift Valley of EthiopiaIncludes bibliographic references.
Feeding by adult weevils and tunneling by larvae significantly impacted the vigour and reproduction of water hyacinth plants. In Ethiopia, the two weevils produced four generations per year indicating their successful establishment. 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. Hold promise as possible bioagents of water hyacinth. Tenuissima, and Alternaria spp. Among the isolates, Alternaria alternata, A.
Alternata were together able to reduce the vegetative growth and fresh weight of water hyacinth plants considerably. Finally, a study on integrated use of Neochetina weevils and an indigenous plant pathogen revealed that the two Neochetina weevils and the fungus A. The study also reinforced that the two weevils are sufficiently host-specific. Eichhorniae showed the highest level of leaf damage and defoliated petioles. Bruchi and two pairs of N.
The survey results also identified 25 fungal species found in association with water hyacinth that belonged to nine genera. Survey results indicated that the weed is distributed in the Rift Valley water bodies located in low, mid and high altitude. 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. 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. The main goal was to develop an effective biocontrol strategy for water hyacinth in the Rift Valley of Ethiopia. Implications of the findings are also discussed in the context of integrated water hyacinth management using the native fungal pathogens and the two weevils.AB - This thesis presents a study on management of water hyacinth (Eichhornia crassipes Solms) using insects and fungal pathogens as bioagents.
Feeding by adult weevils and tunneling by larvae significantly impacted the vigour and reproduction of water hyacinth plants. In Ethiopia, the two weevils produced four generations per year indicating their successful establishment. 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. Hold promise as possible bioagents of water hyacinth. Tenuissima, and Alternaria spp.
This study recommends integrated use of fungal species and the two weevils to control water hyacinth. Alternata were together able to reduce the vegetative growth and fresh weight of water hyacinth plants considerably. Finally, a study on integrated use of Neochetina weevils and an indigenous plant pathogen revealed that the two Neochetina weevils and the fungus A. The study also reinforced that the two weevils are sufficiently host-specific. Eichhorniae showed the highest level of leaf damage and defoliated petioles. Bruchi and two pairs of N.
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