ISHS Acta Horticulturae 338: VI International Workshop on Fireblight
INTEGRATED CONTROL OF FROST INJURY, FIRE BLIGHT, AND FRUIT RUSSET OF PEAR WITH A BLOSSOM APPLICATION OF AN ANTAGONISTIC BACTERIUM |
| Author: | S. Lindow |
| Abstract:
Pseudomonas fluorescens strain A506, which is naturally resistant to 100μg/ml streptomycin and axytetracycline, was applied to pear trees in the field either once at 20% bloom or at 20% and 90% bloom. At two weeks following treatment the mean population of strain A506 was about 105 cells/flower and over 95% of pear flowers had detectable numbers of this antagonist. Over 95% of the total bacteria recovered from flowers from treated trees was strain A506. The incidence of frost injury in flowers shortly after frosts with minimum temperatures of about -4°C and of fruit at harvest was reduced from 70 to 85% on trees treated both with strain A506 and streptomycin compared to trees treated with streptomycin alone. The incidence of Fire Blight strikes was also reduced from 60 to 80% on treated trees compared to control trees. The severity of fruit russet was reduced from 11.7% on trees treated only with streptomycin to 6.5% of the fruit surface on trees treated both with A506 and subsequent streptomycin strays. | |
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