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Nematicidal activity of the Cyanobacterium, Aulosira fertilissima on the hatch of Meloidogyne triticoryzae and Meloidogyne incognita

Abstract The agricultural crops especially paddy, wheat and vegetable crops are prone to attack by plant-parasitic nematodes. A study was conducted to observe nematicidal activity of the cyanobacterium Aulosira fertilissima on the hatching of second stage juveniles (J2) of the root-knot nematodes Meloidogyne triticoryzae and M. incognita. Culture filtrate and standard aqueous extracts of cyanobacterium. Aulosira fertilissima inhibited the hatch of M. triticoryzae (J2). Replacement of aqueous extract by fresh glass distilled water (GDW) caused sudden resumption in hatch. Very low concentration of the aqueous extract stimulated hatching, whereas high concentration of the same was nematostatic. Rapid hatching of M. incognita eggs was observed and most of the hatching was completed within 2 – 3 weeks, whereas M. triticoryzae eggs hatched very slowly over nine weeks.