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Plant Pathology Journal
Year: 2014  |  Volume: 13  |  Issue: 2  |  Page No.: 112 - 119

Efficacy of Soil Amendment with Leaf Powder of Hyptis suaveolens (L.) Poit in the Control of Meloidogyne javanica (Treub) Chitwood on the African Yam Bean, Sphenostylis stenocarpa (Hochst Ex A. Rich) Harms

Christopher C. Onyeke, Godswill C. Ajuziogu, Emmanuel E. Osayi, Christopher D. Nwani and Gregory E. Odo    

Abstract: Studies were carried out in screen house to determine the effects of different inoculum densities (2,000 and 4,000 eggs of Meloidogyne javanica) and different levels (15, 30, 45, 60 and 75 t ha-1) of leaf powder of Hyptis suaveolens soil amendment on the pathogenicity of M. javanica on African yam bean. Results showed that organic soil amendment with H. suaveolens improved on the growth of plants infected with eggs of M. javanica as against the infected plants but unamended. It was also observed in this study that higher soil amendment levels (>30 t ha-1) led to sharp progressive decline in the fresh shoot and root weights of amended plants, which indicates possible phytotoxicity of H. suaveolens leaf powder at amendment levels above 30 t ha-1. H. suaveolens leaf powder amendment reduced significantly (p≤0.05) the number of galls, egg masses, gall index and egg mass index as the amendment levels increased at both low and high inoculum densities. M. javanica reduced significantly (p≤0.05) the number of nodules in infected test plants compared to the uninfected controls. This study also revealed that the pathogenicity of M. javanica was more at high inoculum density generally. Conclusively, this study has shown that application of H. suaveolens as soil amendment reduced the pathogenicity of M. javanica and improved on the growth parameters of the test plant but at higher levels (above 30 t ha-1) it became phytotoxic and highly nematicidal.

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