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The effectiveness ofAgrobacterium radiobacter K84, 0341, and a K84 non-agrocin-producing mutant (K84 Agr- ) in biological control of crown gall on rootstocks of stone fruit trees was determined in three experiments. In experiment 1, K84 and 0341 controlled crown gall on plum plants in soil inoculated with two strains ofAgrobacterium tumefaciens resistant to agrocin 84. In experiment 2, K84 controlled crown gall on peach plants in soils inoculated with strains ofA. tumefaciens sensitive or resistant to agrocin 84 or with a mixture of both. However, the effectiveness of K84 was higher against the sensitive strain than against the resistant strain. There was a residual effect of K84 from one year to another in soil inoculated with the sensitive strains. In experiment 3, K84 and K84 Agr- controlled crown gall on plum and peach plants in soils inoculated with strains ofA. tumefaciens sensitive or resistant to agrocin 84. The control afforded by K84 was higher than that provided by K84 Agr- against the sensitive strain but was similar against the resistant strain.

applied and environmental microbiology

Evidence of Biological Control of Agrobacterium tumefaciens Strains Sensitive and Resistant to Agrocin 84 by Different Agrobacterium radiobacter Strains on Stone Fruit Trees