');background-position:center right 1rem;background-repeat:no-repeat;background-size:1rem;border:var(--idf-border-width-1) solid var(--idf-color-neutral-400);border-radius:var(--idf-border-radius-s);-webkit-box-shadow:none;box-shadow:none;color:var(--idf-color-neutral-700);cursor:pointer;font:unset;height:4rem;padding:var(--idf-spacing-2) var(--idf-spacing-5) var(--idf-spacing-2) var(--idf-spacing-2);-webkit-transition:all .35s ease;transition:all .35s ease;width:100%}.idf-select__select[data-v-91554806]:disabled,.idf-select__select[disabled][data-v-91554806]{background-color:var(--idf-color-neutral-100);background-image:url('data:image/svg+xml;utf8, 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100%}.idf-slideshow__indicator[data-v-cb408abf]{background-color:var(--idf-color-neutral-100);border-radius:100px;bottom:1.6rem;display:-webkit-box;display:-ms-flexbox;display:flex;gap:var(--idf-spacing-1);padding:var(--idf-spacing-2);position:absolute;right:1.6rem;z-index:var(--idf-z-index-default)}.idf-slideshow__indicator-dot[data-v-cb408abf]{background-color:var(--idf-color-neutral-400);border-radius:100%;height:var(--idf-spacing-2);width:var(--idf-spacing-2)}.idf-slideshow__indicator-dot[data-v-cb408abf]:hover{background-color:var(--idf-color-neutral-700);cursor:pointer}.idf-slideshow__indicator-dot.active[data-v-cb408abf]{background-color:var(--idf-color-main-400)}.idf-slider__container[data-v-63cbc747]{display:-webkit-box;display:-ms-flexbox;display:flex;-webkit-box-flex:1;-ms-flex:1;flex:1;justify-items:flex-start;overflow-x:auto;white-space:nowrap}.idf-slider__container[data-v-63cbc747]>*{-ms-flex-negative:0;flex-shrink:0}.idf-standard-inputs[data-v-2c836b79]{--idf-icon-fill-color:currentColor;color:var(--idf-color-neutral-700);display:-webkit-box;display:-ms-flexbox;display:flex;-webkit-box-orient:vertical;-webkit-box-direction:normal;-ms-flex-direction:column;flex-direction:column}.idf-standard-inputs-message[data-v-2c836b79]{-webkit-box-align:start;-ms-flex-align:start;align-items:flex-start;display:-webkit-box;display:-ms-flexbox;display:flex;margin-top:var(--idf-spacing-1)}.idf-standard-inputs-label[data-v-2c836b79]{font-weight:700;margin-bottom:var(--idf-spacing-1)}.idf-standard-inputs[data-v-2c836b79] 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Accueil Toutes les actualités agricoles Comment protéger vos céréales des pucerons à l'automne ? Comment protéger vos céréales des pucerons à l'automne ? Nous rappelons que les semis précoces favorisent la sensibilité des céréales à l’apparition des pucerons (vecteurs de JNO) et des cicadelles (vecteurs de de la maladie des pieds chétifs). Pour que la présence de pucerons à l’automne se traduise par de fortes pertes de rendement en blé ou en orge , il faut un enchaînement de circonstances favorables à la Jaunisse Naissante de l’Orge (JNO) durant la campagne.
L’orge d’hiver est plus sensible à la JNO que le blé tendre . Sur orge, cette maladie virale entraîne souvent des pertes de pieds et d’épis ; sur blé, la JNO apparaît plus tardivement et le remplissage des grains.
La nuisibilité liée à plusieurs facteurs La nuisibilité est liée à la fois au stade de la céréale lors de leur arrivée, à leur nombre et au temps passé sur la parcelle. Les conditions de températures sont importantes pour le vol, la reproduction et la survie des pucerons dans les parcelles : A plus de 12°C, leur activité démarre.
La présence de maïs aurait pu être un vecteur, mais la sécheresse et la précocité des récoltes ont diminué son pouvoir. La présence de repousses de céréales dans l’environnement servira cette année comme plante relais et augmentera le risque.
La nuisibilité est variable pour une même pression de pucerons. L’abondance et le temps de présence sur la parcelle affectent le nombre de plantes « contaminées ». Ensuite, les conditions hivernales influencent la multiplication du virus. Une croissance continue des céréales pendant l’hiver est favorable à la multiplication du virus et au contraire, un hiver froid sera défavorable à leur développement.
Toutes les régions ne sont pas soumises au même climat et chacune doit gérer le risque en tenant compte du climat. Il existe cependant deux leviers pour diminuer les risques de JNO : la date de semis et le choix de la variété en orge d’hiver.
La date de semis : premier levier Les semis les plus précoces augmentent le risque en ayant des conditions favorables aux insectes vecteurs de viroses. Les enquêtes pluriannuelles (Bayer/Inra/ARVALIS) montrent que la proportion de parcelles présentant une forte intensité de virus de la JNO est plus élevée pour les semis plus précoces et diminue lorsque les semis sont tardifs. Par conséquent, les semis tardifs limitent la transmission de virus aux plantes, mais le risque de viroses demeure présent.
Fréquence et intensité de la détection des virus BYDV de la JNO en lien avec la date de semis Source : Données France entière, 2002 à 2015, source enquêtes Bayer / Inra / ARVALIS
Très précoce = 2ème quinzaine de septembre
Précoce = 1ère quinzaine d’octobre - Normal = 2ème quinzaine d’octobre
Tardif = 1ère quinzaine de novembre - Très tardif = 2ème quinzaine de novembre
Les variétés d'orge d'hiver : deuxième levier Les variétés d’orge d’hiver tolérantes à la JNO offrent une protection contre les pucerons. Ces derniers peuvent coloniser les pieds de ces variétés, leur transmettre le virus de la JNO et occasionner quelques symptômes de JNO (décolorations de bouts de feuilles). Cependant, les pertes de rendement sont négligeables par rapport à des variétés sensibles qui, peuvent perdre plus de 50 % de rendement.
La surveillance indispensable Même si le risque est supérieur sur orge que sur blé, il faut observer ces deux céréales. Un semis tardif ne permet pas l’absence de surveillance à l’automne et de lutte insecticide en végétation si nécessaire. Cette dernière peut s’avérer plus efficace sur semis tardif que sur semis précoce, car elle s’applique généralement sur des populations plus faibles de ravageurs.
Une observation des céréales dès la levée est à prévoir en journée ensoleillée pour mieux observer les insectes. La consultation des réseaux de piégeage comme Crop Observer et le BSV est un moyen supplémentaire.
Cette année, vigilance maximale De nombreux facteurs comme les semis précoces, la présence de repousses de céréales, et les conditions climatiques douces sont favorables aux pucerons ; même si la pluies des derniers jours vont freiner leur propagation.
N’oublions pas non plus le risque Cicadelle - Psammotettix alienus- vectrice du virus responsable de la maladie des pieds chétifs (WDV). Les conditions précitées lui sont aussi favorables.
Service Agronomie, Conseils, Innovation - Octobre 2022
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