Synergistic interaction of soilborne plant pathogens and root-attacking insects in classical biological control of an exotic rangeland weed

Caesar, A. J.

doi:10.1016/s1049-9644(03)00053-7

Cited by 54 publications

(40 citation statements)

References 26 publications

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“…The potential problems to host plants arising from root attack by insects include: drought stress to the plant caused by pruning of the root system ANDERSEN, 1987;HOU et al, 1997 , loss of reproductive output DUTCHER et. al., 1979 and an increase in the plant's susceptibility to infection by soil-borne pathogens JIN et al, 1992;CAESAR, 2003 . Further, root-feeding by insects may directly reduce food reserves such as carbohydrates DINTENFASS and BROWN, 1988 , synthesis of numerous growth hormones SKENE, 1975 and plant stability, resulting in lodging GRAY and TOLLEFSON, 1987 .…”

Section: ; Shields Et Al 2009mentioning

confidence: 99%

Otiorrhynchus Ligustici L. (Coleoptera: Curculionidae) I. Comparative Study of the Resistance of Alfalfa Varieties

Nikolova¹,

Georgieva²

2012

bjbabe

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Section: ; Shields Et Al 2009mentioning

confidence: 99%

Otiorrhynchus Ligustici L. (Coleoptera: Curculionidae) I. Comparative Study of the Resistance of Alfalfa Varieties

Nikolova¹,

Georgieva²

2012

bjbabe

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“…In greenhouse studies, Caesar (2003) found that the combined effects of Fusarium oxysporum and Rhizoctonia solani with flea beetle adults and larvae resulted in greater inhibition of Euphorbia esula/virgata than any of the biological control agents alone. In their survey of Lepidium draba throughout Europe, Caesar et al (2010) showed that plants sustaining both insect damage and disease were being colonized by the root pathogen Rhizoctonia solani.…”

Section: Integrating Microbial Herbicides With Other Control Measuresmentioning

confidence: 99%

Microbial Weed Control and Microbial Herbicides

Stubbs¹,

Kennedy²

2012

Herbicides - Environmental Impact Studies and Management Approaches

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“…Associations among weed biological control agents may arise directly or indirectly. The direct association arises, if influx by one agent directly alters the ability of others to pervade the target (Caesar, 2003). The indirect association arises, if attack alters target plant quality, indirectly influencing the feeding, survival and/or reproduction of other agent(s) (Milbrath and Nechols, 2004).…”

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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Synergistic interaction of soilborne plant pathogens and root-attacking insects in classical biological control of an exotic rangeland weed

Cited by 54 publications

References 26 publications

Otiorrhynchus Ligustici L. (Coleoptera: Curculionidae) I. Comparative Study of the Resistance of Alfalfa Varieties

Otiorrhynchus Ligustici L. (Coleoptera: Curculionidae) I. Comparative Study of the Resistance of Alfalfa Varieties

Microbial Weed Control and Microbial Herbicides

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

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