Evaluation of drench treatments with phosphonate derivatives against Pseudomonas syringae pv. syringae on pear under controlled environment conditions |
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Authors: | Concepció Moragrega Charles Manceau Emilio Montesinos |
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Affiliation: | (1) Institute of Food and Agricultural Technology-CeRTA, University of Girona, Avgda. Lluís Santaló, s/n, 17071 Girona, Spain;(2) Centre de Recherches d'Angers, INRA Station de Pathologie Végétale et Phytobactériologie, rue Georges Morel, 49070 Beaucouzé, France |
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Abstract: | Several phosphonate derivatives including theoomycetic antifungal agents phosphonate andtris-o-ethylphosphonate (fosetyl), theethylene-releasing compound 2-chloroethylphosphonate(ethephon), and the antibiotic2-epoxypropylphosphonate (phosphomycin) were evaluatedfor in vitro and in planta activityagainst 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 gHP/l). Also, survival of P. syringae pv. syringae in aqueous solutions ofphosphonate or fosetyl was high. Only phosphomycinshowed significant antibacterial activity invitro (MIC=10-20 µg HP/ml) comparedto streptomycin (1-2 µg a.i./ml). Potted pearplants irrigated with these chemicals and inoculatedwith 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/l.Activities of the other phosphonates were weak butconsistent between experiments. The ED50s on wholeplants were 2.1, 3.3, and 6.9 g HP/l for ethephon, phosphonate and fosetyl, respectively. TheED50of P. syringae pv. syringaeincreased from 6.5 in non-treated controls to 7.7-8.8log10 cfu/ml on plants treated with phosphonatesat 1.86 g HP/l. It was concluded thatdrench treatment with fosetyl is not a practicaloption for control of P. syringae pv. syringae on pear. |
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Keywords: | fosetyl phosphonate ethephon phosphomycin median effective dose antibacterial activity Pseudomonas syringae pear |
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