THE DETRIMENTAL EFFECT OF ERAGROSTIS CURVULA ON THE MELOIDOGYNE JAVANICA POPULATION OF SOILS BY H. KOEN 1) AND N. GROBBELAAR Department of Plant Physiology and Biochemistry, University of Pretoria, Republic of South Africa A dense stand of Eragrostis curvula (Schrad.) Nees (Ermelo type) markedly decreases the Meloidogyne population of the soil. Although the nematode larvae can penetrate mechanically damaged roots of the grass, they do not enter the undamaged roots. No evidence could be found for the presence of a nematostatic or nematocidal agent emanating from the roots of E. curvula plants. It was shown that a dense stand of E. curvula drastically reduces the free oxygen concen- tration in the soil. Indications are that the low oxygen concentration is the direct and/or indirect cause of the death of the Meloidogyne larvae. Van der Linde ( 1 95 6 ) tested several Eragrostis curvula varieties against rootknot nematodes (Meloidogyne spp.) and found only E. curvula (Ermelo type) to be resistant to all the Meloidogyne species that commonly occur in South African soils 2 ). However, apart from the work by Scheffer, Kickuth & Visser (1962) which appeared subsequent to the conclusion of this study, no work appears to
Nematologica – Brill
Published: Jan 1, 1965
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