  Models to predict the combined effects of temperature and relative humidity on Pectobacterium Atrosepticum and Pectobacterium carotovorum subsp. Carotovorum population density and soft rot disease development at the surface of wounded potato tubers; ; Lepoivre, Philippe  et alin Journal of Plant Pathology [=JPP] (2012), 94(1), 181-191 The main objectives of this study were to evaluate and model the influence of temperature (10, 15 and 20°C), relative humidity (86, 96 and 100%) and initial concentration of bacterial inoculum (105, 107 ... [more ▼] The main objectives of this study were to evaluate and model the influence of temperature (10, 15 and 20°C), relative humidity (86, 96 and 100%) and initial concentration of bacterial inoculum (105, 107 et 109 CFU ml-1) on the population density of Pectobacterium atrosepticum (Pba) and Pectobacterium carotovorum subsp. carotovorum (Pcc) which are important potato pathogens in temperate climates, and on the development of soft rot symptoms caused by these bacteria at the surface of wounded potatoes tubers under controlled conditions. Experiments were carried out according to a Box-Behnken experimental design, simplifying prediction of the combined effects of three controlled factors. With both bacterial species, statistical analysis showed a significant effect of temperature, relative humidity and initially applied bacterial concentration on population dynamics and soft rot development at the surface of wounded potato tubers. Multiple regression analyses and the contour plots showed that the temperature is the most important factor, followed by the initially applied bacteria concentration and relative humidity. More than 64% of the variability of the soft rot symptoms observed could be explained by the presence of Pba and Pcc at the level of wounded potato tubers under the combined effect of tested factors. The quadratic polynomial models developed in our research should integrate the heterogeneity of tested bacteria belonging to the same species (which was not evaluated in this preliminary investigation) in further research. [less ▲] Detailed reference viewed: 74 (1 ULg)TIMELY FUNGICIDE APPLICATION: A STRATEGY TO MINIMIZE FUSARIUM HEAD BLIGHT AND ASSOCIATED MYCOTOXIN PRODUCTION IN WINTER WHEAT; ; El Jarroudi, Moussa et alin Journal of Plant Pathology [=JPP] (2011), 93(1, supplement), 115-118 Re-emergence of Fusarium head blight (FHB) on wheat should be taken into account in the global management of cropped fields, especially with respect to fungicide application schemes, due to harmful toxin ... [more ▼] Re-emergence of Fusarium head blight (FHB) on wheat should be taken into account in the global management of cropped fields, especially with respect to fungicide application schemes, due to harmful toxin production. The aim of this study was to assess, in three experimental fields representative of the various topoclimatological zones of Luxembourg, the impact of timing of fungicide spray application on the prevalence and severity of FHB, the concentration of mycotoxins, and Fusarium strain pattern in winter wheat. It was found that fungicide treatments and the time of application had a significant impact on the amount of deoxynivalenol (DON) detected (P=0.027, ANOVA). In our experimental design, the application of fungicides at 3 different times increased the amount of DON in winter wheat compared to two and single applications. The importance of the timing of fungicide application is discussed in relation to limiting toxin contamination in the field. [less ▲] Detailed reference viewed: 22 (1 ULg) First report of the breakdown of the YR17 resistance gene to wheat stripe rust in the Grand Duchy of LuxembourgEl Jarroudi, Moussa ; ; Tychon, Bernard et alin Journal of Plant Pathology [=JPP] (2011), 93(1), 243 Detailed reference viewed: 24 (5 ULg)SITE – SPECIFIC MONITORING FOR DISEASE FORECASTING IN WINTER WHEAT.El Jarroudi, Moussa ; ; et alin Journal of Plant Pathology [=JPP] (2011), 93(Supplement 1), 19-20 Detailed reference viewed: 66 (9 ULg)First report of wheat powdery mildew and its severity in the Grand-Duchy of Luxembourg over the 2003-2009 periodEl Jarroudi, Moussa ; ; Tychon, Bernard et alin Journal of Plant Pathology [=JPP] (2009), 91(S4), 109 Detailed reference viewed: 40 (11 ULg)Systemic resistance induction in tomato by Pseudomonas putida BTP1: investigation of defense pathways.; Duby, Franceline ; Ongena, Marc et alin Journal of Plant Pathology [=JPP] (2008), 90 Detailed reference viewed: 3 (0 ULg)Defence responses induced in tobacco cells by Bacillus lipopeptides acting as elicitors of systemic resistance in plants; ; Thonart, Philippe et alin Journal of Plant Pathology [=JPP] (2008), 90 Detailed reference viewed: 1 (0 ULg)Ecological fitness of plant-beneficial Bacillus subtilis strains in soil: influence of rhizosphere specific parameters on surfactin synthesis.; ; Thonart, Philippe et alin Journal of Plant Pathology [=JPP] (2008), 90 Detailed reference viewed: 2 (0 ULg)Gossypol. A substance likely involved in the cotton / Fusarium oxysporum f. sp. vasinfectum interaction; ; et al in Journal of Plant Pathology [=JPP] (2004) Detailed reference viewed: 7 (0 ULg) |
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