Abstract
Red algae Phacelocarpus tristichus J. Agardh and brown algae, Turbinaria ornata J. Agardh at three concentrations (0.5, 1.0, and 2.0%) were evaluated for the management the infection of Meloidogyne incognita for tomato plants in controled conditions.The methanolic extracts of the two species improved growth parameters of the infected and uninfected plants. Both P. tristichus and T. ornata methanolic extracts pronounced nematicidal activities against M. incognita infecting tomato. Accordinglly, P. tristichus (2.0%) shows significant suppression for root galling, the number of developmental stages, females, egg masses, eggs/ egg mass and total nematode population. However, T. ornata at different concentrations surpassed P. tristichus and significantly induced chemical constitutions in terms of NPK, crude proteins and carbohydrates in dried leaves of infected tomato with M. incognita. It could be concluded that, P. tristichus and T. ornata were recommended as biofertilizers and a promising tool in the integrated management of M. incognita infecting tomato.
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