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The suppression effect of Bacillus amyloliquefacien Ba33 against TMV and PVY by biological detect through necrotic lesions host and RNA detect through RT-PCR was studied. The result showed that the suppression ratio of necrotic lesions against TMV and PVY was 95.25% and 99.22% respectively. And Ba33 could suppression RNA replication of TMV and PVY in Nicotiana tabacum var. NC89 leaves from 24 to 84h...
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