Bacterial wilt caused by Pseudomonas so anacearum is aserious problem on tomato plant. Plant which are infected by a virulent microbe could resist infection of the pathogen.Irradiating microbe by gamma rays is expected to weaken the pathogen, so it could be used for protecting the plant frompathogen infection. The result of this experiment showed thatP. so/anacearum irradiated by gamma rays at doses of 0.4until 0,8 kGy could protect infection of virulent P. so/anacearum, but the ones irradiated 1.0 until 8.0 kGy could not. I. Djamika clan E. Suwadji; Sub Bslithorti Segunung, Pusst Aplikasi Isotop dan Radiasi, BATAN
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