Biological control of root rot-root knot disease complex of tomato |
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Authors: | Siddiqui Imran A Qureshi Shamin A Sultana V Ehteshamul-Haque S Ghaffar Abdul |
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Institution: | (1) Soilborne Diseases Research Laboratory, Department of Botany, University of Karachi, Karachi, 75270, Pakistan;(2) Soilborne Diseases Research Laboratory, Department of Botany, University of Karachi, Karachi, 75270, Pakistan;(3) Department of Biochemistry, University of Karachi, Karachi, 75270, Pakistan |
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Abstract: | Efficacy of Pseudomonas aeruginosa alone or in combination with Paecilomyces lilacinus was evaluated in the control of root-knot nematode and root-infecting fungi under laboratory and field conditions. Ethyl
acetate extract (1 mg/ml) of P. lilacinus and P. aeruginosa,respectively, caused 100 and 64% mortality of Meloidogyne javanica larvae after 24 h. Ethyl acetate fractions of biocontrol agents were more effective than hexane extracts in the suppression
of M. javanica larvae, indicating that active nematicidal compounds are intermediary in polarity. In field experiments, biocontrol fungus
and bacterium significantly suppressed soilborne root-infecting fungi including Macrophomina phaseolina, Fusarium oxysporum, Fusarium solani, Rhizoctonia solani and Meloidogyne javanica, the root-knot nematode. P. lilacinus parasitized eggs and female of M. javanica and this parasitism was not significantly influenced in the presence of P. aeruginosa. P. aeruginosa was reisolated from the inner root tissues of tomato, whereas P. lilacinusdid not colonize tomato roots.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | biological control Paecilomyces lilacinus Pseudomonas aeruginosa root-knot nematode root-infecting fungi tomato |
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