Biological control of fire blight in pear orchards with a formulation of Pantoea agglomerans strain Eh 24

Biological control of fire blight in pear orchards with a formulation of Pantoea agglomerans strain Eh 24

Biological control by using epiphytic bacteria against Erwinia amylovora has been considered as an alternative method for controlling the disease. Talc-based formulation of Pantoea agglomerans strain Eh-24 was applied at 30% and 100% bloom on two pear orchards which were selected from different loca...

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Bibliographic Details
Published in:Brazilian journal of microbiology Vol. 35; no. 3; pp. 224 - 229
Main Authors: Özaktan, Hatice(University of Ege Faculty of Agriculture Department of Plant Protection), Bora, Tayyar(University of Ege Faculty of Agriculture Department of Plant Protection)
Format: Journal Article
Language:English
Published: São Paulo Sociedade Brasileira de Microbiologia 01-09-2004
Springer Nature B.V
Subjects:
antagonistic bacteria
bactérias antagonistas
biological control
controle biológico
Erwinia amylovora
fire blight
MICROBIOLOGY
Pantoea agglomerans
Pantoea agglomerans (Erwinia herbicola)
bactérias antagonistas
antagonistic bacteria
controle biológico
Pantoea agglomerans
biological control
fire blight
Erwinia amylovora
Pantoea agglomerans (Erwinia herbicola)
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Summary:Biological control by using epiphytic bacteria against Erwinia amylovora has been considered as an alternative method for controlling the disease. Talc-based formulation of Pantoea agglomerans strain Eh-24 was applied at 30% and 100% bloom on two pear orchards which were selected from different locations in the Aegean Region in Turkey. Pear orchard trials were replicated for two years (1999 and 2000) in each place. Talc-based formulation of P. agglomerans strain Eh-24 was sprayed on pear trees which were naturally infected with E. amylovora. In the orchard trials conducted in 1999 and 2000, talc-based formulation of P. agglomerans strain Eh-24 reduced the percentage of blighted blossoms on pear orchards by 63% to 76%, approximately. Copper oxychloride+maneb was less effective in reducing the incidence of blossom infection by E. amylovora in each pear orchard than the bioformulation treatment. P. agglomerans strain Eh-24 labelled with StrR+ was applied at 30% and 100% bloom to monitor the colonization and population dynamics of P. agglomerans on pear blossoms. The population size of P. agglomerans strain Eh-24 strR+ on pear blossoms increased from 2x10(4) to 1.3x10(6) cfu per blossom over 18 days. Controle biológico de Erwinia amylovora através do uso de bactérias epifíticas tem sido considerado um método alternativo para o controle de "fire blight". Uma formulação de Pantoea agglomerans Eh 24 em talco foi utilizada em pereiras a 30% e a 100% de floração, em duas plantações selecionadas na região Aegean da Turquia. Os experimentos foram repetidos duas vezes (1999 e 2000) em cada plantação. A formulação de P. agglomerans foi aspergida nas pereiras naturalmente infectadas com E. amylovora. Nos experimentos de 1999 e 2000, a redução da porcentagem de ocorrência de "fire blight" foi reduzida aproximadamente em 63% e em 76%, respectivamente. Oxicloreto de cobre + maneb foi menos eficiente na redução da infecção por E. amylovora do que o tratamento com a bioformulação. P. agglomerans Eh 24 marcada com StrR+ foi aplicada a 30% e a 100% de floração para monitorar a colonização e a dinâmica da população de P. agglomerans nos brotos das pereiras. Após 18 dias, a população de P. agglomerans aumentou de 2x10(4) para 1,3 x 10(6) UFC/broto.
Bibliography:10.1590/S1517-83822004000200010
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822004000200010
ISSN:1517-8382
1678-4405
1678-4405
DOI:10.1590/S1517-83822004000200010