Abstract
The effectiveness of aqueous extracts derived from nine algal species atdifferent concentrations on egg hatching and mortality of Meloidogyne incognita(Kofoid and White) Chitwood juveniles after various exposure times weredetermined in vitro. Results indicated that Enteromorpha flexuosa at theconcentration of 80% was the best treatment for suppressing the egg hatching withvalue of 2 % after 5 days of exposure, followed by Dilsea carnosa extract (3%) andCodium fragile (4%) at the same concentration and exposure time. Likewise,application of C. fragile, D. carnosa , E. flexuosa and Cystoseira myrica extracts atthe concentrations of 80 and 60% were highly toxic to the nematodes, killing morethan 90 % of nematode larva after 72 hours of exposure while the others gave quitelow mortalities. The characteristic appearances in shape of the nematodes killed byC. fragile, D. carnosa , C. myrica, E. flexuosa and Sargassum muticum wassigmoid (Σ-shape) with some curved shape; whereas, the nematodes killed by otheralgal species mostly followed straight or bent shapes. The present study proved thatfour species of algae C. fragile, D. carnosa, C. myrica and E. flexuosa could beused for the bio-control of root-knot nematodes.
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