European Journal of Plant Pathology (1998) 104, 171-180

From Pestinfo-Wiki
Jump to: navigation, search

C. Moragrega, C. Manceau and E. Montesinos (1998)
Evaluation of drench treatments with phosphonate derivatives against Pseudomonas syringae pv. syringae on pear under controlled environment
European Journal of Plant Pathology 104 (2), 171-180
Abstract: Several phosphonate derivatives including the oomycetic antifungal agents phosphonate and tris-o-ethylphosphonate (fosetyl), theethylene-releasing compound 2-chloroethylphosphonate (ethephon), and the antibiotic2-epoxypropyl phosphonate (phosphomycin) were evaluated for in vitro and in planta activity against Pseudomonas syringae pv. syringae. Inhibition of colony growth in CYE agar byphosphonate, fosetyl and etephon was very slight (minimal inhibitory concentrations MIC= 0.31-;0.62 g HP O2/3 -/l). Also, survival of P. syringae pv. syringae in aqueous solutions ofphosphonate or fosetyl was high. Only phosphomycin showed significant antibacterial activity in vitro (MIC=10-20 µg HP O2/3 -/ml) compared to streptomycin (1-2 µg a.i./ml). Potted pear plants irrigated with these chemicals and inoculated with Pseudomonas syringae pv. syringae had significantly less disease than non-treatedcontrols ( P<0.001). Phosphomycin was the mostactive compound with a median effective dose (ED50) of less than 0.62 g HP O2/3 -/l. Activities of the other phosphonates were weak but consistent between experiments. The ED50s on wholeplants were 2.1, 3.3, and 6.9 g HP O2/3 -/l for ethephon, phosphonate and fosetyl, respectively. The ED50 of P. syringae pv. syringae increased from 6.5 in non-treated controls to 7.7-8.8 log10 cfu/ml on plants treated with phosphonates at 1.86 g HP O2/3 -/l. It was concluded that drench treatment with fosetyl is not a practical option for control of P. syringae pv. syringae on pear.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Emilio Montesinos, Concepció Moragrega, Charles Manceau

Research topic(s) for pests/diseases/weeds:
control - general


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Pseudomonas syringae pv. syringae Pear (Pyrus)
Pseudomonas syringae