{"id":24913,"date":"2022-07-20T12:58:33","date_gmt":"2022-07-20T12:58:33","guid":{"rendered":"https:\/\/prograin.ca\/ca\/?p=24913"},"modified":"2025-03-26T16:19:12","modified_gmt":"2025-03-26T16:19:12","slug":"la-chrysomele-du-haricot-et-le-soya","status":"publish","type":"post","link":"https:\/\/prograin.ca\/ca\/fr\/2022\/07\/20\/la-chrysomele-du-haricot-et-le-soya\/","title":{"rendered":"La chrysom\u00e8le du haricot dans le soya"},"content":{"rendered":"\n<p>La chrysom\u00e8le du haricot est un ravageur d\u2019une grande importance dans la culture du soya au Qu\u00e9bec et dans l\u2019Est de l\u2019Ontario.<\/p>\n\n\n\n<h2>Comment la reconnaitre?<\/h2>\n\n\n\n<p>La couleur des chrysom\u00e8les adultes varie entre le jaune, le beige et le rouge. Elles ont les pattes noires et jaunes. Leur t\u00eate est noire avec des antennes jaunes aux extr\u00e9mit\u00e9s fonc\u00e9es. Sur le corps, elles ont des rectangles de couleurs noires et un triangle invers\u00e9 sur l\u2019arri\u00e8re du cou de la m\u00eame couleur. Elles mesurent environ 5 mm. <\/p>\n\n\n\n<p>Les \u0153ufs sont de forme ovale et sont de couleur rouge, orange ou jaune. Leur taille est de 0,80 mm par 0,35 mm. Quant aux larves matures, elles sont beiges avec les extr\u00e9mit\u00e9s noires et mesurent 10 mm de long. Elles ont trois paires de pattes pr\u00e8s de la t\u00eate et une patte charnue sur le dernier segment abdominal.<\/p>\n\n\n\n<h2>Cycle biologique\u00a0<\/h2>\n\n\n\n<p>Les chrysom\u00e8les adultes passent l\u2019hiver dans l\u2019herbe ou sous les feuilles mortes. Elles sortent au mois de mai ou juin lorsque le temps est plus chaud. C\u2019est pendant cette p\u00e9riode qu\u2019elles s\u2019accouplent et pondent de 250 \u00e0 300 \u0153ufs pr\u00e8s de la base des plants de soya. Ces derniers \u00e9closent apr\u00e8s 10 jours en moyenne. <\/p>\n\n\n\n<p>Les chrysom\u00e8les hivernantes produisent une g\u00e9n\u00e9ration par an au Qu\u00e9bec. Elles meurent ensuite vers la fin juin pour laisser place \u00e0 la deuxi\u00e8me g\u00e9n\u00e9ration. En ce qui concerne les nouvelles larves, elles passent par trois stades de d\u00e9veloppement sur 18 \u00e0 24 jours et se transforment en nymphes (pupes). Les nymphes restent enfouies dans le sol pendant environ 7 jours avant d&#8217;\u00e9merger en tant qu&#8217;adultes<\/p>\n\n\n\n<h2>Dommages <\/h2>\n\n\n\n<p>D\u00e8s le printemps, la premi\u00e8re g\u00e9n\u00e9ration de chrysom\u00e8les se nourrit de feuilles de soya en y laissant des trous entre les nervures. Elles s\u2019attaquent aussi aux cotyl\u00e9dons et aux jeunes plantules. Entre juillet et ao\u00fbt, c\u2019est au tour des nouveaux adultes de causer des dommages aux feuilles, mais aussi aux gousses. <\/p>\n\n\n\n<p>Les grains seront alors affect\u00e9s de plusieurs fa\u00e7ons, car ils seront expos\u00e9s \u00e0 l\u2019humidit\u00e9 ou la s\u00e9cheresse, comporteront des blessures et seront sujets aux maladies fongiques. La marbrure du haricot issu d\u2019un virus transmis par la chrysom\u00e8le pourrait \u00e9galement affecter la qualit\u00e9 du grain. Quant aux larves, elles peuvent causer des dommages aux racines.<\/p>\n\n\n\n<h2>D\u00e9pistage\u00a0des adultes<\/h2>\n\n\n\n<ul><li>Au stade plantule (VE \u00e0 V2)&nbsp;: &nbsp;choisir 5 rangs au hasard dans le champ et compter le nombre de chrysom\u00e8les du haricot sur une distance de 5 m\u00e8tres par rang. N\u2019oubliez pas de regarder sous les feuilles et de vous d\u00e9placer lentement pour ne pas les effrayer; <\/li><\/ul>\n\n\n\n<ul><li>Apr\u00e8s le stade plantule (V2), jusqu\u2019au remplissage des gousses (R4)&nbsp;: \u00c9tablir le % de d\u00e9foliation sur 5 plants, \u00e0 10 endroits choisis au hasard dans le champ; <\/li><\/ul>\n\n\n\n<ul><li>Stade R5 et R6&nbsp;: choisir 10 sections dans le champ et \u00e9valuer les dommages sur 10 plants. \u00c9tablir le % de d\u00e9foliation sur 5 plants des 10 examin\u00e9s par section.<\/li><\/ul>\n\n\n\n<h2>Seuil \u00e9conomique d\u2019intervention<strong>\u00a0<\/strong><\/h2>\n\n\n\n<p>Le seuil \u00e9conomique d\u2019intervention de l\u2019Ontario est utilis\u00e9 pour d\u00e9terminer si l\u2019on doit appliquer un traitement sur les plants de soya. En plus du seuil, on recommande de tenir compte de la valeur \u00e9conomique de la culture ainsi que du potentiel de rendement au champ pour faire le bon choix.<\/p>\n\n\n\n<p>Il faut intervenir lorsque le nombre de chrysom\u00e8les ou le pourcentage de d\u00e9foliation atteint l\u2019un des chiffres inscrits ci-dessous lors des diff\u00e9rents stades&nbsp;: <\/p>\n\n\n\n<ul><li>Au stade plantule&nbsp;: 16 chrysom\u00e8les adultes par 30 cm de rang;<\/li><\/ul>\n\n\n\n<ul><li>Stades v\u00e9g\u00e9tatifs&nbsp;: 30 \u00e0 50&nbsp;% de d\u00e9foliation;<\/li><\/ul>\n\n\n\n<ul><li>Au stade de floraison et au stade de remplissage des gousses (R1 \u00e0 R4)&nbsp;: 15 \u00e0 35&nbsp;% de d\u00e9foliation;<\/li><\/ul>\n\n\n\n<ul><li>Au stade R4 \u00e0 R6&nbsp;: 25&nbsp;% de d\u00e9foliation ou 10&nbsp;% des gousses endommag\u00e9es.<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" width=\"410\" height=\"303\" src=\"https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2022\/07\/image.png\" alt=\"\" class=\"wp-image-24916\" srcset=\"https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2022\/07\/image.png 410w, https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2022\/07\/image-300x222.png 300w, https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2022\/07\/image-24x18.png 24w, https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2022\/07\/image-36x27.png 36w, https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2022\/07\/image-48x35.png 48w\" sizes=\"(max-width: 410px) 100vw, 410px\" \/><figcaption><sup>Nebraska University<\/sup><\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>La chrysom\u00e8le du haricot est un ravageur d\u2019une grande importance dans la culture du soya au Qu\u00e9bec et dans l\u2019Est de l\u2019Ontario. Comment la reconnaitre? La couleur des chrysom\u00e8les adultes varie entre le jaune, le beige et le rouge. Elles ont les pattes noires et jaunes. Leur t\u00eate est noire avec des antennes jaunes aux [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":24914,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advgb_blocks_editor_width":"","advgb_blocks_columns_visual_guide":""},"categories":[272],"tags":[],"author_meta":{"display_name":"anouk","author_link":"https:\/\/prograin.ca\/ca\/author\/anouk\/"},"featured_img":"https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2022\/07\/iStock-1405083649-e1658262860469-300x200.jpg","yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.11 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>La chrysom\u00e8le du haricot dans le soya - Prograin - Canada<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/prograin.ca\/ca\/fr\/2022\/07\/20\/la-chrysomele-du-haricot-et-le-soya\/\" \/>\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La chrysom\u00e8le du haricot dans le soya - Prograin - Canada\" \/>\n<meta property=\"og:description\" content=\"La chrysom\u00e8le du haricot est un ravageur d\u2019une grande importance dans la culture du soya au Qu\u00e9bec et dans l\u2019Est de l\u2019Ontario. Comment la reconnaitre? La couleur des chrysom\u00e8les adultes varie entre le jaune, le beige et le rouge. Elles ont les pattes noires et jaunes. Leur t\u00eate est noire avec des antennes jaunes aux [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/prograin.ca\/ca\/fr\/2022\/07\/20\/la-chrysomele-du-haricot-et-le-soya\/\" \/>\n<meta property=\"og:site_name\" content=\"Prograin - Canada\" \/>\n<meta property=\"article:published_time\" content=\"2022-07-20T12:58:33+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-03-26T16:19:12+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2022\/07\/iStock-1405083649-e1658262860469.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1253\" \/>\n\t<meta property=\"og:image:height\" content=\"836\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"anouk\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"anouk\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimation du temps de lecture\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/prograin.ca\/ca\/fr\/2022\/07\/20\/la-chrysomele-du-haricot-et-le-soya\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/prograin.ca\/ca\/fr\/2022\/07\/20\/la-chrysomele-du-haricot-et-le-soya\/\"},\"author\":{\"name\":\"anouk\",\"@id\":\"https:\/\/prograin.ca\/ca\/#\/schema\/person\/9918862eb1b8e1b71dfc1e6c7b54fee5\"},\"headline\":\"La chrysom\u00e8le du haricot dans le soya\",\"datePublished\":\"2022-07-20T12:58:33+00:00\",\"dateModified\":\"2025-03-26T16:19:12+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/prograin.ca\/ca\/fr\/2022\/07\/20\/la-chrysomele-du-haricot-et-le-soya\/\"},\"wordCount\":661,\"publisher\":{\"@id\":\"https:\/\/prograin.ca\/ca\/#organization\"},\"inLanguage\":\"fr-CA\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/prograin.ca\/ca\/fr\/2022\/07\/20\/la-chrysomele-du-haricot-et-le-soya\/\",\"url\":\"https:\/\/prograin.ca\/ca\/fr\/2022\/07\/20\/la-chrysomele-du-haricot-et-le-soya\/\",\"name\":\"La chrysom\u00e8le du haricot dans le soya - 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Comment la reconnaitre? La couleur des chrysom\u00e8les adultes varie entre le jaune, le beige et le rouge. Elles ont les pattes noires et jaunes. Leur t\u00eate est noire avec des antennes jaunes aux extr\u00e9mit\u00e9s fonc\u00e9es. Sur le corps, elles ont des rectangles de couleurs noires et un triangle invers\u00e9 sur l\u2019arri\u00e8re du cou de la m\u00eame couleur. Elles mesurent environ 5 mm. Les \u0153ufs sont de forme ovale et sont de couleur rouge, orange ou jaune. Leur taille&hellip;<\/p>\n","category_list":"<a href=\"https:\/\/prograin.ca\/ca\/fr\/category\/non-classe-fr\/\" rel=\"category tag\">Non class\u00e9<\/a>","author_info":{"name":"anouk","url":"https:\/\/prograin.ca\/ca\/author\/anouk\/"},"comments_num":"0 comments","featured_image_urls_v2":{"full":["https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2022\/07\/iStock-1405083649-e1658262860469.jpg",1253,836,false],"thumbnail":["https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2022\/07\/iStock-1405083649-e1658262860469-150x150.jpg",150,150,true],"medium":["https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2022\/07\/iStock-1405083649-e1658262860469-300x200.jpg",300,200,true],"medium_large":["https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2022\/07\/iStock-1405083649-e1658262860469-768x512.jpg",768,512,true],"large":["https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2022\/07\/iStock-1405083649-e1658262860469.jpg",1253,836,false],"1536x1536":["https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2022\/07\/iStock-1405083649-e1658262860469.jpg",1253,836,false],"2048x2048":["https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2022\/07\/iStock-1405083649-e1658262860469.jpg",1253,836,false],"menu-24x24":["https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2022\/07\/iStock-1405083649-e1658262860469-24x16.jpg",24,16,true],"menu-36x36":["https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2022\/07\/iStock-1405083649-e1658262860469-36x24.jpg",36,24,true],"menu-48x48":["https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2022\/07\/iStock-1405083649-e1658262860469-48x32.jpg",48,32,true]},"post_excerpt_stackable_v2":"<p>La chrysom\u00e8le du haricot est un ravageur d\u2019une grande importance dans la culture du soya au Qu\u00e9bec et dans l\u2019Est de l\u2019Ontario. Comment la reconnaitre? La couleur des chrysom\u00e8les adultes varie entre le jaune, le beige et le rouge. Elles ont les pattes noires et jaunes. Leur t\u00eate est noire avec des antennes jaunes aux extr\u00e9mit\u00e9s fonc\u00e9es. Sur le corps, elles ont des rectangles de couleurs noires et un triangle invers\u00e9 sur l\u2019arri\u00e8re du cou de la m\u00eame couleur. Elles mesurent environ 5 mm. Les \u0153ufs sont de forme ovale et sont de couleur rouge, orange ou jaune. Leur taille&hellip;<\/p>\n","category_list_v2":"<a href=\"https:\/\/prograin.ca\/ca\/fr\/category\/non-classe-fr\/\" rel=\"category tag\">Non class\u00e9<\/a>","author_info_v2":{"name":"anouk","url":"https:\/\/prograin.ca\/ca\/author\/anouk\/"},"comments_num_v2":"0 comments","coauthors":[],"tax_additional":{"categories":{"linked":["<a href=\"https:\/\/prograin.ca\/ca\/fr\/category\/non-classe-fr\/\" class=\"advgb-post-tax-term\">Non class\u00e9<\/a>"],"unlinked":["<span class=\"advgb-post-tax-term\">Non class\u00e9<\/span>"]}},"comment_count":"0","relative_dates":{"created":"Posted 4 ann\u00e9es ago","modified":"Updated 1 ann\u00e9e ago"},"absolute_dates":{"created":"Posted on 20 juillet 2022","modified":"Updated on 26 mars 2025"},"absolute_dates_time":{"created":"Posted on 20 juillet 2022 12 h 58 min","modified":"Updated on 26 mars 2025 16 h 19 min"},"featured_img_caption":"Cerotoma trifurcata (also known as the bean leaf beetle)","series_order":"","_links":{"self":[{"href":"https:\/\/prograin.ca\/ca\/wp-json\/wp\/v2\/posts\/24913"}],"collection":[{"href":"https:\/\/prograin.ca\/ca\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prograin.ca\/ca\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prograin.ca\/ca\/wp-json\/wp\/v2\/users\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/prograin.ca\/ca\/wp-json\/wp\/v2\/comments?post=24913"}],"version-history":[{"count":33,"href":"https:\/\/prograin.ca\/ca\/wp-json\/wp\/v2\/posts\/24913\/revisions"}],"predecessor-version":[{"id":27410,"href":"https:\/\/prograin.ca\/ca\/wp-json\/wp\/v2\/posts\/24913\/revisions\/27410"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/prograin.ca\/ca\/wp-json\/wp\/v2\/media\/24914"}],"wp:attachment":[{"href":"https:\/\/prograin.ca\/ca\/wp-json\/wp\/v2\/media?parent=24913"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prograin.ca\/ca\/wp-json\/wp\/v2\/categories?post=24913"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prograin.ca\/ca\/wp-json\/wp\/v2\/tags?post=24913"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}