Articles
EVALUATION OF BIOLOGICAL CONTROL AGENTS, SYSTEMIC ACQUIRED RESISTANCE INDUCERS AND BACTERICIDES FOR THE CONTROL OF FIRE BLIGHT ON APPLE BLOSSOM
Article number
489_96
Pages
553 – 558
Language
Abstract
Experiments were conducted in a research orchard in Geneva, NY to evaluate the efficacy of biological control agents, systemic acquired resistance (SAR) inducers, bactericides, a calcium/boron formulation and tartaric acid for control of the blossom blight phase of fire blight on the susceptible apple cultivar Idared in 1997 and 1998. Treatments were replicated five times with 150–200 blossom clusters per replication in a completely randomized block design.
In 199, all treatments had significantly less disease than the untreated control.
There was no significant difference in disease incidence among Gentamicin, BlightBan A506 + Agri-mycin, Vigor-Cal + Agri-mycin, and Agri-mycin treatments.
Actigard, Harpin, BlightBan A506 and C9-1 resulted in statistically significant reductions in the amount of blossom blight, but were significantly less effective than Agri-mycin.
Russeting (phytotoxicity) was observed on fruits of ManKocide and Kocide 101 treatments, which both reduced blossom blight significantly.
In 1998, Blight Ban A506 Actigard, Harpin and Vigor-cal treatments did not have significantly less disease than the inoculated untreated control.
Blight Ban C9-1, Mancozeb and tartaric acid, resulted in significantly less disease than on the inoculated untreated control but were significantly less effective than Agri-mycin.
Kocide 2000, NuCop 3L, Vigor-CAl + Agri-mycin, Kocide 2000 + Mancozeb, COC, Nucop and Agri-mycin treatments resulted in statistically significant reductions in the amount of blossom blight.
Again russeting were observed in any treatments that received copper compounds.
The biological control product, BlightBan, if registered, might have a role in New York in IPM programs with reduced streptomycin applications.
SAR inducers, tartaric acid, Gentamicin show sufficent promise to merit further research.
Copper and its combination with Mancozeb could be used as an alternative bactericide for processing apples for the control of blossom blight.
In 199, all treatments had significantly less disease than the untreated control.
There was no significant difference in disease incidence among Gentamicin, BlightBan A506 + Agri-mycin, Vigor-Cal + Agri-mycin, and Agri-mycin treatments.
Actigard, Harpin, BlightBan A506 and C9-1 resulted in statistically significant reductions in the amount of blossom blight, but were significantly less effective than Agri-mycin.
Russeting (phytotoxicity) was observed on fruits of ManKocide and Kocide 101 treatments, which both reduced blossom blight significantly.
In 1998, Blight Ban A506 Actigard, Harpin and Vigor-cal treatments did not have significantly less disease than the inoculated untreated control.
Blight Ban C9-1, Mancozeb and tartaric acid, resulted in significantly less disease than on the inoculated untreated control but were significantly less effective than Agri-mycin.
Kocide 2000, NuCop 3L, Vigor-CAl + Agri-mycin, Kocide 2000 + Mancozeb, COC, Nucop and Agri-mycin treatments resulted in statistically significant reductions in the amount of blossom blight.
Again russeting were observed in any treatments that received copper compounds.
The biological control product, BlightBan, if registered, might have a role in New York in IPM programs with reduced streptomycin applications.
SAR inducers, tartaric acid, Gentamicin show sufficent promise to merit further research.
Copper and its combination with Mancozeb could be used as an alternative bactericide for processing apples for the control of blossom blight.
Publication
Authors
M.T. Momol, J.L. Norelli, H.S. Aldwinckle
Keywords
Erwinia amylovora
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