{"id":175,"date":"2023-05-10T15:02:12","date_gmt":"2023-05-10T19:02:12","guid":{"rendered":"https:\/\/web.uri.edu\/biocontrol-draft\/?page_id=175"},"modified":"2024-01-17T12:44:34","modified_gmt":"2024-01-17T17:44:34","slug":"knapweed","status":"publish","type":"page","link":"https:\/\/web.uri.edu\/biocontrol\/projects\/knapweed\/","title":{"rendered":"Knapweed"},"content":{"rendered":"\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:66.66%\">\n<p class=\"fullwidth\">Knapweeds are an invasive plant species which has been recognized as a threat to native plants in Rhode Island. Black knapweed (<em>Centaurea nigra<\/em>) and meadow knapweed (a hybrid of black and brown knapweed,&nbsp;<em>C. jacea<\/em>) are the predominant species here in RI. Knapweeds displace native vegetation, negatively impact native wildlife, decrease hay quality for grazing animals, and threaten populations of bobolinks,&nbsp;<em>Dolichonyx oryzivorus<\/em>, and other meadow birds.<\/p>\n\n\n\n<p class=\"fullwidth\">The URI Biocontrol Lab has obtained a permit to release&nbsp;<em>Larinus obtusus<\/em>, a biological control agent for knapweed species found in Rhode Island.&nbsp;<em>L. obtusus<\/em>&nbsp;is a seed-feeding weevil that is native to Europe and the Middle East; it has recently been released by biological control programs across the United States and Canada. Larval feeding results in the death of developing seeds which reduces the spread of the knapweed population. Also, defoliation from adults can be extensive when populations are high, which can stunt and kill plants. Currently,&nbsp;<em>L. obtusus<\/em>&nbsp;is the recommended agent for release in Rhode Island against black knapweed as a result of its habitat preferences and host specificity. Research has shown these pests prefer moist knapweed habitats with cooler temperatures and feed on only&nbsp;<em>Centaurea<\/em>&nbsp;species.<\/p>\n\n\n\n<p class=\"fullwidth\"><strong><em>Larinus obtusu<\/em>s was released in Little Compton and Tiverton, Rhode Island, in 2015 and 2016.<\/strong><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\">\n<h2 class=\"wp-block-heading\">Related Documents<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li><a rel=\"noreferrer noopener\" href=\"https:\/\/bugwoodcloud.org\/resource\/files\/6223.pdf\" target=\"_blank\">Biology and Biocontrol of Knapweed<\/a>&nbsp;<\/li><li><a rel=\"noreferrer noopener\" href=\"http:\/\/www.docs.dcnr.pa.gov\/cs\/groups\/public\/documents\/document\/dcnr_010255.pdf\" target=\"_blank\">Black, Brown, and Spotted Knapweed<\/a>&nbsp;<\/li><li><a rel=\"noreferrer noopener\" href=\"https:\/\/your.kingcounty.gov\/dnrp\/library\/water-and-land\/weeds\/BMPs\/Meadow-Knapweed-control.pdf\" target=\"_blank\">Meadow Knapweed Management Practices<\/a>&nbsp;<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Related Links<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li><a rel=\"noreferrer noopener\" href=\"https:\/\/www.eddmaps.org\/distribution\/uscounty.cfm?sub=5282\" target=\"_blank\">C. nigra Distribution Map<\/a><\/li><li><a rel=\"noreferrer noopener\" href=\"https:\/\/www.eddmaps.org\/distribution\/uscounty.cfm?sub=5278\" target=\"_blank\">C. jacea Distribution Map<\/a><\/li><\/ul>\n<\/div>\n<\/div>\n\n\n\n<h1 class=\"wp-block-heading\">U<strong>RI  Student  Posters<\/strong><\/h1>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/web.uri.edu\/biocontrol\/wp-content\/uploads\/sites\/2154\/Biological_Control_of_Knapweeds-scaled-1-scaled.jpg\" rel=\"lightbox[175]\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"731\" src=\"https:\/\/web.uri.edu\/biocontrol\/wp-content\/uploads\/sites\/2154\/Biological_Control_of_Knapweeds-scaled-1-1024x731.jpg\" alt=\"\" class=\"wp-image-532\" srcset=\"https:\/\/web.uri.edu\/biocontrol\/wp-content\/uploads\/sites\/2154\/Biological_Control_of_Knapweeds-scaled-1-1024x731.jpg 1024w, https:\/\/web.uri.edu\/biocontrol\/wp-content\/uploads\/sites\/2154\/Biological_Control_of_Knapweeds-scaled-1-300x214.jpg 300w, https:\/\/web.uri.edu\/biocontrol\/wp-content\/uploads\/sites\/2154\/Biological_Control_of_Knapweeds-scaled-1-768x549.jpg 768w, https:\/\/web.uri.edu\/biocontrol\/wp-content\/uploads\/sites\/2154\/Biological_Control_of_Knapweeds-scaled-1-1536x1097.jpg 1536w, https:\/\/web.uri.edu\/biocontrol\/wp-content\/uploads\/sites\/2154\/Biological_Control_of_Knapweeds-scaled-1-2048x1463.jpg 2048w, https:\/\/web.uri.edu\/biocontrol\/wp-content\/uploads\/sites\/2154\/Biological_Control_of_Knapweeds-scaled-1-364x260.jpg 364w, https:\/\/web.uri.edu\/biocontrol\/wp-content\/uploads\/sites\/2154\/Biological_Control_of_Knapweeds-scaled-1-500x357.jpg 500w, https:\/\/web.uri.edu\/biocontrol\/wp-content\/uploads\/sites\/2154\/Biological_Control_of_Knapweeds-scaled-1-1000x714.jpg 1000w, https:\/\/web.uri.edu\/biocontrol\/wp-content\/uploads\/sites\/2154\/Biological_Control_of_Knapweeds-scaled-1-1280x914.jpg 1280w, https:\/\/web.uri.edu\/biocontrol\/wp-content\/uploads\/sites\/2154\/Biological_Control_of_Knapweeds-scaled-1-2000x1429.jpg 2000w, https:\/\/web.uri.edu\/biocontrol\/wp-content\/uploads\/sites\/2154\/Biological_Control_of_Knapweeds-scaled-1-scaled.jpg 2560w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Knapweeds are an invasive plant species which has been recognized as a threat to native plants in Rhode Island. Black knapweed (Centaurea nigra) and meadow knapweed (a hybrid of black and brown knapweed,&nbsp;C. jacea) are the predominant species here in RI. Knapweeds displace native vegetation, negatively impact native wildlife, decrease hay quality for grazing animals, [&hellip;]<\/p>\n","protected":false},"author":4711,"featured_media":0,"parent":17,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":"","_links_to":"","_links_to_target":""},"class_list":["post-175","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/web.uri.edu\/biocontrol\/wp-json\/wp\/v2\/pages\/175","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/web.uri.edu\/biocontrol\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/web.uri.edu\/biocontrol\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/web.uri.edu\/biocontrol\/wp-json\/wp\/v2\/users\/4711"}],"replies":[{"embeddable":true,"href":"https:\/\/web.uri.edu\/biocontrol\/wp-json\/wp\/v2\/comments?post=175"}],"version-history":[{"count":5,"href":"https:\/\/web.uri.edu\/biocontrol\/wp-json\/wp\/v2\/pages\/175\/revisions"}],"predecessor-version":[{"id":865,"href":"https:\/\/web.uri.edu\/biocontrol\/wp-json\/wp\/v2\/pages\/175\/revisions\/865"}],"up":[{"embeddable":true,"href":"https:\/\/web.uri.edu\/biocontrol\/wp-json\/wp\/v2\/pages\/17"}],"wp:attachment":[{"href":"https:\/\/web.uri.edu\/biocontrol\/wp-json\/wp\/v2\/media?parent=175"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}