Nematicidal properties of some algal aqueous extracts against root-knot nematode, Meloidogyne incognita in vitro | ||||
| Egyptian Journal of Agronematology | ||||
| Article 6, Volume 15, Issue 1, January 2016, Page 67-78 PDF (279.57 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejaj.2016.57484 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Ahmed Nour El-Deen  1, 2; Ahmed Issa3, 2
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| 1Nematology Research Unit, Agricultural Zoology Dept., Faculty of Agriculture, Mansoura University, Egypt | ||||
| 2Biology Dept., Faculty of Science, Taif University, Saudi Arabia | ||||
| 3Department of Botany, Faculty of Science, Assiut University, Assiut , Egypt | ||||
| Abstract | ||||
| The effectiveness of aqueous extracts derived from nine algal species at different concentrations on egg hatching and mortality of Meloidogyne incognita (Kofoid and White) Chitwood juveniles after various exposure times were determined in vitro. Results indicated that Enteromorpha flexuosa at the concentration of 80% was the best treatment for suppressing the egg hatching with value of 2 % after 5 days of exposure, followed by Dilsea carnosa extract (3%) and Codium fragile (4%) at the same concentration and exposure time. Likewise, application of C. fragile, D. carnosa , E. flexuosa and Cystoseira myrica extracts at the concentrations of 80 and 60% were highly toxic to the nematodes, killing more than 90 % of nematode larva after 72 hours of exposure while the others gave quite low mortalities. The characteristic appearances in shape of the nematodes killed by C. fragile, D. carnosa , C. myrica, E. flexuosa and Sargassum muticum was sigmoid (Σ-shape) with some curved shape; whereas, the nematodes killed by other algal species mostly followed straight or bent shapes. The present study proved that four species of algae C. fragile, D. carnosa, C. myrica and E. flexuosa could be used for the bio-control of root-knot nematodes. | ||||
| Keywords | ||||
| algae; in Vitro; Meloidogyne incognita; Nematicidal activity | ||||
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