Overwintering and Distribution Pattern ofPseudomonas syringaepv.papulansand pv.syringaein Apple Buds

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Abstract
P. syringae pv. [pathovar] papulans (PSP) and pv. syringae (PSS) were isolated from dormant ''Mutsu'', ''Golden Delicious'' and ''Empire'' apple buds showing visible internal necrosis. PSP was detected more frequently from ''Mutsu'' buds than from ''Golden Delicious'' or ''Empire''. PSP was often associated with the necrotic bud tissue and was consistently recovered from a higher percentage of necrotic buds than PSS. Both pathovars were also recovered from apparently healthy (no visible necrosis) ''Mutsu'', ''Golden Delicious'' and ''Empire'' buds. A characteristic distribution pattern of both bacteria was found in ''Mutsu'' buds. Neither bacterium was detected on the outer bud scales, and the highest populations were generally associated with the central bud tissues. PSP was generally recovered at higher populations from ''Mutsu'' buds, wheras PSS was predominant in ''Golden Delicious''.

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