Synergistic effect of antagonistic bacterium and Propiconazole against Botryosphaeria berengeriana f. sp. piricola
LIU You-zhou
CHANG You-hong
WEI Ben-qiang
LIU Yong-feng
CHEN Zhi-yi
Abstract：25 pathogen strains of B. berengeriana f. sp piricola and 871 bacteria strains were isolated and purified from the diseased leaves, the diseased pomes, the healthy leaves, the healthy pomes, the diseased tress, the healthy tress and soil from the orchards of Nanjing,Lianyungang and Gaoyou ,Jiangsu Province. The pathogenicity test of the 25 pathogen strains of B. berengeriana f. sp. piricola showed that strain N-BG-L5 had the strongest pathogenicity for pear ring rot. Antagonistic exami-nation against B. berengeriana f. sp. piricola revealed that strain sf 628 from all tested 871 bacteria processed strong and steady antagonism with the inhibition zone 45 mm. Toxicity test of 26 fungicides on. B. berengeriana f. sp. piricola showed 25% Propiconazole could inhibit most effectively the mycelia growth of B. berengeriana f. sp. piricola with EC_(50) value 0. 152 2 mg·L~(-1). The mixed experiments against B. berengeriana f. sp. piricola showed that the synergistic ratios (SR) were greater than 1.5 when the mixed ratios were 1:3, 1:2, 1:1 and 1:2 between antagonistic bacterium and Propiconazole and the SR was 1.071 under the mixed ratio was 3:1. The synergism under the ratio of 1:3 between antagonistic bacterium and Propiconazole was most significant with synergistic ratio 2.942.
Keywords：Pear ring rotAntagonistic bacteriumPropiconazoleMixSynergistic ratio
Publication Date：2010-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 82-87 )