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THE EFFECT OF SOME FATTY ACIDS AND pH ON A SOIL NEMATODE BY W. B. BANAGE AND S. A. VISSER Department of Agricultural Biology and Department of Zoology, Makerere University College, Kampala, Uganda Observations are presented on the effects of fatty acid solutions on a Dorylaimid nematode, Dorylaimus sp. Formic, acetic, propionic, butyric and valeric acids in distilled water at nine concen- trations ranging from 1 M to 0.001 M were exponentially toxic to the nematode which, however, was not affected by a 0.0001 M solution and considerably less so by sodium salts of the acids. Evidence was obtained that the undissociated acid molecule was the chief toxic factor. Formic acid was less toxic at any value while all the other acids were similar to each other in their effect. The acid solutions have no easily observable chemical effects on the protoplasm or the cuticle of the nematode. INTRODUCTION The effect of fatty acids on soil nematodes has previously been studied by Johnston (1959) and Stephenson (1945). Both workers found that the acids: formic, acetic, propionic and butyric were highly effective in immobilizing nema- todes. Johnston, who worked with the Tylenchid Tylenchorhynchus m.artini found that, at the different
Nematologica – Brill
Published: Jan 1, 1965
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