Abstract
The study showed a negative correlation among soil – saprobs Aspergillus nigur , A. flavus, A. ochraceus , Mucor sp. , Penicillium glabrum , Stemphylium loti and Fusarium oxysporum f. sp. radicis – lycopersici (Forl) , i . e. ,a significant reduction in its inoculum density , with aprominance of A . nigur and A. flavus. Regression analysis exhibited that excess of Diammonium phosphate and of Forl inoculum resulted in reduction of its pathogenicity . Manures were increased each of saprobs and the pathogen.Thus , Manures as soil amendments stimulated saprophytic competition in the soil and also inhibited the growth and sporulation of Forl , particularly A. niger. The application of Diammonium phosphate plus mixed saprophytes and Forl inoculum decreased disease incidence insignificantly in the greenhouse, the use of manures also reduced disease severity. Soil humidity increase by 1% resulted in increase of severity by 0.02.
