A and B. Isolation of Aspergillus niger from banana leaves; C. Pure culture of Fusarium oxysporum; D. Pure culture of Aspergillus niger; E and F. Interaction between fungus and nematodes; G. Fungal spores; H. Bunch of nematodes along with eggs; I. Mass culture of A. avenae after grew on F. oxysporum; J. Various embryogenetic stages of A. avenae.