Effect of pea-wheat mixture on the severity of Septoria tritici blotch - Archive ouverte HAL Accéder directement au contenu
Poster De Conférence Année : 2014

Effect of pea-wheat mixture on the severity of Septoria tritici blotch

Associations blé-pois : effet sur la sévérité de la septoriose du blé

Résumé

To reduce environmental impacts of intensive agriculture, it is necessary to find alternative practices to control wheat diseases, such as the use of species mixture —several crops grown at the same space and for a significant time— (Finckh et al., 2000, Bannon et al. 1998) The aim of this study was to investigate the effect of pea-wheat mixture and its management on the severity of Septoria Tritici Blotch STB. Following a 3-year experiment in Grignon, a specific experiment was set up in 2013, to investigate more in detail the effect of nitrogen fertilization and sowing dates, found in previous years to have an impact on the control of STB with species mixtures. Treatments were: wheat (250 pl.m-2) sown at 2 dates (S1: 15/10/2013, S2: 15/11/2013) and fertilized at 2 rates (N1 pea-wheat balance rate: 60 kg N ha-1, N2 wheat balance rate: 190 kg N ha-1, three applications), and pea-wheat mixture (125 pl m-2 wheat; 40 pl m-2 pea) sown at 2 dates (S1, S2) and fertilized at 3 rates (N0: 0 kg N ha-1, N1, N2). Diseased surfaces and senescence surface were assessed weekly from April 23th to July 23th. Meteorological data and crop relative humidity, biomass and nitrogen nutrition index (NNI) at flowering, and biomass and yields at harvest, were also assessed. Due to high rain during the epidemic season, the disease pressure was high, leading to high infection for all wheat and pea-wheat treatments. The nitrogen fertilization increased the disease severity for wheat and pea-wheat treatments, whereas the S2 sowing date led to a slight increase compared to S1. Pea-wheat mixture led to a slight decrease in the disease severity compared to wheat. On the one hand, the barrier effect occurs due to the pea (nonhost of the STB) but on the other hand, the observed increase of the relative humidity in peawheat mixture compared to wheat may favor the infection and sporulation of the disease. Concerning agronomic performances, the NNI was higher in pea-wheat compared to wheat, and the mean wheat yield in mixture (57 q ha-1) was higher than half-mean yield of the sole wheat (73 q ha-1), confirming the interest of pea-wheat mixtures in terms of nitrogen nutrition and yield. This experiment proves that pea-wheat mixture may reduce STB, particularly when the disease pressure is not too high. Nitrogen fertilization has to be limited in order to reduce the disease risk and to maintain the agronomic performances of pea-wheat mixtures.
Fichier principal
Vignette du fichier
recueil_jjc AUSSOIS 2014_1.pdf (8.4 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01378300 , version 1 (05-06-2020)

Identifiants

  • HAL Id : hal-01378300 , version 1
  • PRODINRA : 254631

Citer

Elise Pelzer, Tiphaine Vidal, Valérian Lebon, Nesrine Tarsim, Claude C. Pope de Vallavieille, et al.. Effect of pea-wheat mixture on the severity of Septoria tritici blotch. 10èmes Rencontres de Phytopathologie-Mycologie de la Société Française de Phytopathologie (SFP), Jan 2014, Aussois, France. 2014, des Journées Jean Chevaugeon 10èmes Rencontres de Phytopathologie-Mycologie de la Société Française de Phytopathologie (SFP). ⟨hal-01378300⟩
319 Consultations
16 Téléchargements

Partager

Gmail Facebook X LinkedIn More