Effect of plant extracts on radial growth of Helminthosporium oryzae causative of Brown spot disease of rice under in-vitro by Iwuagwu, C.C, Ononuju, C.C, Umechuruba, C.I, Nwogbaga, A.C, Obidiebube, A.E, Okolie, H, Obasi, C.C, Uwaoma, A.O

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