Effects of fluorescent pseudomonads on the potato blackleg syndrome

Authors

  • D. J. RHODES,

    1. Department of Mycology and Plant Pathology, Queen's University, Newforge Lane, Belfast, Northern Ireland BT9 5PX
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    • *Department of Plant Pathology, Washington State University, Pullman WA 99164-6430, USA

  • C. LOGAN

    1. Department of Mycology and Plant Pathology, Queen's University, Newforge Lane, Belfast, Northern Ireland BT9 5PX
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SUMMARY

In four field trials in 1983 and 1984 potato tubers were inoculated by dipping them at planting in a suspension of Erwinia carotovora subsp. atroseptica and then treated with a powder formulation of two strains of fluorescent pseudomonads (B 10 and I 13) isolated from potatoes. lnoculation with E. carotovora increased blackleg and reduced emergence, plant growth, tuber size and weight compared with uninoculated controls. These effects were partially reversed by treatment of tubers with fluorescent pseudomonads which also reduced contamination by E. carotovora and the soft-rot potential of progeny tubers. In some trials a mixture of both pseudomonad isolates delayed the breakdown of the mother tuber although individual treatments did not.

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