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Journal of Plant Sciences
Year: 2006  |  Volume: 1  |  Issue: 4  |  Page No.: 374 - 377

Effects of Plant Extracts and Plant Density on the Severity of Leafspot Disease of Groundnut (Cercospora arachidicola. Hori) in Imo State

G.O. Ihejirika, M.I. Nwufo, C.I. Duruigbo, E.U. Onwerenadu, O.P. Obilo, E.R. Onuoha and K.O. Ogbede    

Abstract: A two season Experiment was conducted during the rainy seasons of 2003 and 2004 respectively, to determine the effects of plant extracts and plant density on the severity of leafspot disease and yield of groundnut Cercospora arachidicola Hori in Imo State. Analysis of variance indicated that plant extract was significant on leafspot disease severity and seed yield (kg ha-1) 110.05, 107.85 in 2003 and 2004. Similarly, plant density was highly significant on leafspot disease severity and seed yield (kg ha-1) 91.15, 88.36. Azadirachta indica spray recorded lowest leafspot disease severity while no spray (control) recorded highest. Plant density (10x10) cm recorded highest leafspot disease severity while (40x40) cm had the lowest. Also Azadirachta indica spray recorded the lowest seed yield (kg ha-1) 18.06; 17.08. Plant density of (10x10) cm recorded the lowest seed yield (kg ha-1) 16.22, 15.19, while (20x20) cm recorded highest seed yield (kg ha-1) 22.40; 20.69. leafspot disease severity increased with plants age.

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