ISHS Acta Horticulturae 338: VI International Workshop on Fireblight
ORCHARD EVALUATION OF CHEMICAL AND BIOLOGICAL SPRAY MATERIALS TO CONTROL FIRE BLIGHT |
| Authors: | J. Norelli, H. Aldwinckle |
| Abstract:
The biological control agent Frostban A is composed of Pseudomonas syringae strain 742RS (24%), P. fluorescens strains A506 (23%) and 1629RS (24%), and inerts (29%). Frostban A significantly reduced the amount of blossom blight in the orchard in comparison to untreated control, but it was significantly less effective than streptomycin. In 1992, Frostban A was applied to trees during full bloom at a rate of 494 g/ha, both 24 hr before and 24 hr after artificial inoculation with E. amylovora. Aliette (aluminum tris (O-ethyl phosphonate)) resulted in weak blossom blight control in both 1991 and 1992 orchard evaluations with artificial inoculation. In both years Aliette did not significantly reduce the amount of blossom blight in comparison to untreated controls and was significantly less effective than streptomycin. Aliette was applied at rates of 2.24 and 4.48 kg/hectare. In 1991, Aliette was applied 24 hr, 96 hr, or 24 and 96 hr prior to inoculation, while in 1992 Aliette was applied 120 and 24 hr prior to inoculation (spring application), the previous fall, or with both fall and spring applications. | |
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