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The interaction of the fungus,  Fusarium oxysporum  f. sp.  vasinfectum  (FOV), and the nematode,  Meloidogyne incognita , on wilt disease on “Essoumtem” and Clemson spineless okra varieties, was examined in pot and field experiments from September 2016 to June 2017, in the University of Ghana farms. Four-week-old “Essoumtem” and Clemson spineless seedlings for pot experiment and one-week-old “Essoumtem” and Clemson spineless seedlings for field experiment were inoculated with fungus,  Fusarium oxysporum , and nematode,  Meloidogyne incognita . The individual, simultaneous, and sequential inoculation of second stage juveniles (at 1000 J 2 /kg soil) of  Meloidogyne incognita  and  Fusarium oxysporum  (1.1 × 10 6  cells/kg soil) resulted in significant reduced plant growth parameters (plant height, plant girth, chlorophyll content, fresh and dry shoot weights, and fresh and dry root weights). Maximum suppression in plant growth parameters was observed in plants that received NF21 ( Fusarium oxysporum  inoculated 21 days after  Meloidogyne incognita  on okra) and  F 21 (fungus inoculated 21 days after seedling emergence) treatments for pot and field experiments, respectively. The least suppression of plant growth parameters was observed in separate inoculations of the two pathogens for both pot and field experiments. Maximum suppression in yield parameters was observed in okra plants that received NF21 and  F 21 treatments for pot and field experiments, respectively. Minimal yield suppression was observed for individual inoculations ( N  and  F  treatments) in both pot and field experiments. The highest severity of wilt disease was observed on okra plants that received NF21 and  F 21 treatment in both pot and field experiments. Plants in control plots had higher yields and the least wilt incidences (0.0%).

international journal of agronomy

Pathogenicity of Meloidogyne incognita and Fusarium oxysporum f. sp. vasinfectum on Growth and Yield of Two Okra Varieties Cultivated in Ghana