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Infection of pruning wounds by epiphytic populations of the bacterial canker pathogen, Clavibacter michiganensis subsp. michiganensis, increased the amount of diseased foliage and vascula colonization in field-grown tomato plants in 1991 but not in 1990. Pruning significantly reduced yield from inoculated plants compared with nonpruned inoculated plants in 1991 but not in 1990. Inoculation significantly reduced estimated yield in both years. Pruning had no effect on disease development or yield in noninoculated tomato plants
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William M. Carlton (1994) studied this question.
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