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Castor (Ricinus communis L.) and groundnut (Arachis hypogaea L.) are the two important oilseed crops grown in India. Of the various soil borne diseases, the wilt caused by Fusarium oxysporum f. sp. ricini in castor and the collar rot caused by Aspergillus niger in groundnut are the major diseases. The effect of polymers was tested on wilt pathogen of castor and collar rot pathogen of groundnut separately by soil inoculation in pot culture studies. The chitosan (0.25%) coated castor and groundnut seeds were grown in F. oxysporum f. sp. ricini and Aspergillus niger inoculated soil respectively there was significant difference in per cent germination, vigou index-I and vigour index-II with minimum per cent disease incidence of 34.60 and 68.80 respectively, when compared to synthetic polymer-II and control.
Key words: Castor, germination, Aspergillus niger, Fusarium oxysporum.