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Potential of green manure crops in suppressing root knot nematodes in French beans

By: William Maina Muiru, Erick. Ogumo, John Wangai Kimenju, Daniel Mukunya

Key Words: Bio-fumigant, Green manure, Root knot nematodes, Suppression

Int. J. Agron. Agri. Res. 11(1), 90-97, July 2017.

Certification: ijaar 2017 0011


Root knot nematode is one of the major pests on French bean (Phaseolus vulgaris L.) and the control is mainly through the use of synthetic nematicides. The high costs and increased safety concerns of nematicides has necessitated research for eco-friendly and sustainable methods. This study was conducted to evaluate the efficacy of green manure plants in suppressing root-knot nematode (RKN) in French beans. Field and greenhouse experiments were carried out in a Randomized Complete Block Design and Completely Randomized Designs, respectively. This was done at selected flower farms to evaluate the efficacy of four green manure crops namely Caliente mustard (Sinapis alba), Nemat (Eruca sativa), Sudan grass (Sorghum sudanense) and African Marigold (Tagetes minuta). These were compared with Metam sodium and Vydate® (Oxamyl) positive control. Damages on plants were assessed based on galling indices, crop biomass, J2 counts and tomato yield. There was a significant (P ≤ 0.05) difference in RKN population densities, galling indices and yield between the green manure treatments and the control in both field and greenhouse trials. Root-knot nematode densities and galling indices were highest in the untreated control, however, no significant (P ≥ 0.05) differences in the efficacy of green manure plants and Metam sodium in the greenhouse was observed. The green manure crops reduced the population densities of RKN by over 90% in the greenhouse condition and by over 67% under field conditions. The results of this study indicate that the green manure plants can be adopted to suppress RKN in French beans.

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Potential of green manure crops in suppressing root knot nematodes in French beans

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William Maina Muiru, Erick. Ogumo, John Wangai Kimenju, Daniel Mukunya.
Potential of green manure crops in suppressing root knot nematodes in French beans.
Int. J. Agron. Agri. Res. 11(1), 90-97, July 2017.
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