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Apple seedlings (ev. Melntosh were stunted when grown in pasteurized field soil to which four fungi, previously isolated from apple replant disease (ARD) soil, were added. Twenty‐one isolates of Bacillus sulnths produced inhibition zones in vitro against 20 ARD fungi. Isolate BACT‐1 ol B. subtilis showed significant antagonism against 17 fungi isolated from ARD soil on potato dexirose agar and apple plant height was increased in its presence in pesteurized and fertilized soil in glasshouse pot tests. Plant height also increased in the presence of isolate F.BW‐4 of B.subtilis.in pasteurized and fertilized soil in glasshouse pot tests but EBW‐4 liid not show antagonism against most of the ARD tungi in vitro. The growth of apple seedlings was stunted in the presence of 12 isolates of B. subtilis. However, fertilization of non pasteurized soil with NPK 1l‐55‐0 reversed the stunting effect. Under field conditions, BACT‐1 and EBW‐4 isolates. led to increased shoot growth in unfertilized and unppasteurized ARD soil.
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Utkhlde et al. (1989) studied this question.
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