Bacterial sheath brown rot of rice caused byPseudomonas fuscovaginaein Malagasy

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Abstract
Bacterial sheath brown rot, caused by Pseudomonas fuscovaginae appeared to be widespread in irrigated rice between 1300 and 2000 m elevation in Malagasy. Inhibition of panicle emergence increased with altitude. Local cultivars suffered much less than the introduced half‐dwarf ones from the International Rice Research Institute or the International Rice Cold Tolerance Nursery. In basic biochemical and serological tests, 22 P. fuscovaginae strains from Malagasy were similar to reference strains from Burundi and Japan, and several showed a higher aggressiveness in pathogenicity tests.