EVALUATING THE EFFECTIVENESS OF SOME ORGANIC FERTILIZERS, BIO-PREPARATIONS AND THEIR COMBINATIONS TO RESIST FUSARIUM WILT DISEASE ON CUCUMBER

Abstract

      The results of isolation and pathogenicity testing of the isolates showed that the fungus F.oxysporium varied in pathogenicity intensity, reaching the highest intensity for isolate D, which reached a seed inhibition rate of 55.2%. The laboratory results proved the high antagonistic ability of the fungus T. harzianum against the fungus F.oxysporium, which reached 1 on the Bell scale, and the inhibition rate of the bacterium B. subtilis reached 84% for the colony of the fungus F.O. The pesticide Tachigazol did not show any effect for the method of working the filtrate, but it showed its high effect in reducing the colony of the fungus. as the inhibition rate reached 93.52% at the highest concentration of 300 PPM and for both methods of working the filtrate filtered and unfiltered, while there was a variation in the results of the inhibition rate according to the method of working the filtrate for organic fertilizer, as the filtrate of Vermicompost fertilizer and Spent mushroom compost A. bisporus (S.M.C.A) unfiltered gave an inhibition rate of 74.82% and 49.32% respectively and with a significant difference from the filtered filtrate, as the inhibition rate reached 31.14 and 19.81% respectively. The field results indicate that using fertilizer combinations together with biological preparations reduced the percentage and severity of infection as the combination of Vermicompost fertilizer with T. harzianum excelled in recording the lowest percentage and severity of infection, which reached 31.8% and 0.33 respectively, and also improved the fertilizer combination in growth traits, as stem length and root length and wet weight and dry weight reached 186.3 cm and 32.7 cm and 413.71 and 90.10% respectively, as well as achieving the highest rate for yield in a combination of S.M.C.A fertilizer with T.harzianum, as the average plant production reached 1.730 Kg.