Bio-active potential of African chewing gum (Azanza garckeana) aqueous leaf extract on second stage juvenile mortality of root-knot nematode (Meloidogyne incognita)

An experiment was conducted to determine the efficacy Azanza garckeana on root-knot nematode (Meloidogyne incognita) juvenile (J2) at the central laboratory, Federal College of Horticulture Dadin Kowa, Gombe State. M. incognita juveniles (J2) were treated with five concentrations (0, 25, 50, 75, and 100% v/v) of A. garckeana aqueous leaf extract (ALE) and exposed for 6, 12, 24, 48, and 72 hours. The 5 x 4 factorial experiments was set up in a completely randomized design (CRD) and replicated three times. The results showed that there was a significant difference (p < 0.05) among the various concentrations and time of exposure on juvenile mortality of M. incognita. Irrespective of the time of exposure, treatment with 100 % (v/v) concentration of A. garckeana (ALE) significantly (p < 0.05) recorded the highest juvenile mortality. This was followed by treatment with a 75 % (v/v) concentration of A. garckena (ALE) while the untreated control had the minimal juvenile mortality of M. incognita. Sensolato, juvenile mortality of M. incognita increased with an increase in concentration and time of exposure. The study revealed that Azanza garckena leave extract possessed potential nematicidal properties responsible for juvenile mortality of M. incognita, which was largely influenced by concentration and time of exposure. Therefore, the use of Azanza garckena leave extract can serve as an alternative to synthetic nematicides for the management of M. incognita.