2003/12/01 by J TSIANTOS, J. Tsiantos, P PSALLIDAS +3
Agricultural and Biological Sciences · Biochemistry, Genetics and Molecular Biology · #Plant Pathogenic Bacteria Studies #Plant Pathogens and Fungal Diseases #Plant-Microbe Interactions and Immunity
paper · doi:10.1111/j.1744-7348.2003.tb00300.x
openalex publication_date 2003/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Summary The efficacy of various chemicals as alternatives to antibiotics for the control of fireblight ( Erwinia amylovora) on pear trees was tested. The chemicals were applied in two ways. In 1999 and 2000, preselected pear twigs (80–90% bloom stage) were sprayed once either preventively 1 day before inoculation or curatively one or three days after artificial inoculation with pathogen concentrations of 10 5 and 10 7 cfu ml −1 . In 2000 and 2001, whole trees were sprayed 2 and 4 days before artificial inoculation of the flowers. From the incidence of diseased flowers it appeared that Bion (50% benzothiadiazole) at 0.2 g litre −1 H 2 O and Aliette (80% fosetyl‐Al) at 2.5 g litre −1 H 2 O showed considerable preventive action by eliciting systemic acquired resistance mostly when they were applied in the whole trees. However the best control was achieved with the antibiotic Agrept (20% streptomycin) at 0.5 g litre −1 H 2 O. This showed both preventive and curative action. Kocide (77% copper hydroxide) at 0.9 g litre −1 H 2 O, Dentamet (citric acid in chelate) at 1.5 ml litre −1 H 2 O, Bactosan (an extract from the plant Pongamia pinnatd) at 3.0 g litre −1 H 2 O and Bion at 0.1 g litre −1 H 2 O, showed preventive action, but only when the inoculum concentration was low.