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Effects of Neem (Azadirachta Indica) Leaf Extracts On Populatons of Pratylenchus Brachyurus and On the Growth and Yield of Maize

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For more content, see Nematology.

Four water extracts of neem leaves each in three concentrations of 1.5, 1.0, and 0.5 kg fresh leaves/3 1. water was directly toxic to P. brachyurus in in-vitro tests under laboratory conditions. Boiled extracts became toxic within the first 4 hr exposure, having a linear relationship between concentration and "death" rate which approached an asymptote value at 0.5 kg/3 1. concentration at 24 hr exposure. Lime (Citrus aurantifolia) fruit juice reduced their toxicity. Boiled extracts without lime reduced maize root populations of P. brachyurus significantly under semi-field conditions. Percentage reduction was linearly related to extract concentration. Grain yield, plant heights and root weights were significantly increased in plots receiving the extract. Strong correlation existed between these increases and reductions in root populations of P. brachyurus and extract concentrations. Neem leaf extracts thus appear to contain nematicides which are probably systemic in function.

Affiliations: 1: Department of Agricultural Biology, University of Ibadan, Nigeria


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