THE USE OF OIL EMULSIONS FOR IMPROVING THE EFFICACY OF Altemaria elchhomiae MYCOHERB1C10E ON WATER HYACINTH | ||||
| Journal of Plant Production | ||||
| Article 11, Volume 28, Issue 7, July 2003, Page 5365-5385 PDF (2.73 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2003.252509 | ||||
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| Author | ||||
| Y. M. Shabana, | ||||
| Plant Pathology Department, Faculty of Agriculture, Mansoura University, EI·Mansoura 35516, Egypt | ||||
| Abstract | ||||
| The fungus A Itemaria e ichhomiae isolate #5 (Ae5) is being developed as a mycoherblcide agent for controUlng water hyacinth (Eichhomia crassipes) in Egypt. Inoculum concentrations above 10% (mycelial wet weight) were equally effective in the management of water hyacinth. There was an inverse relationship between the fungal culture age (up to 9 week old) and inoculum infecUvily; the younger mycelial inoculum was more virulent on the weed plants than older ones. Applications 0 f A e5 ina n aqueous carrier and/or in nine different invert/oil emulsions were evatuated for the biocontrol of water hyacinth without a post·treatment dew period under natural (outdoor) conditions. The invert/oil emulsions were developed to provide moisture and to retard evaporation from the fungal inoculum applied so that the fungal propagules could germinate and Infect the target weed under relatively dry conditions. All of the invert and/or oil emulsion formulations induced higher levels 01 cisease on water hyacinth plants when compared to the aqueous suspension formulatiCJI. under dew.free conditions. RedUCing the oil content in the Ae5 emulsion formulati0!ftrom 30 to 5% had no significant effect On the formulation's infectivity against wate~ hyacinth. In the absence old ew, A e5 f onmulated inc ottonseed 0 iI emulsion caused 1 00% control of water hyacinth in the outdoor field plots 7 to 13 weeks after applicatiOn. Thus, the results confirm the utl1ity and feasibility of oil emulsions as formulating materials for bioherblcides under the lack of dew conditions. | ||||
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