{"id":2675,"date":"2021-08-19T00:03:23","date_gmt":"2021-08-19T07:03:23","guid":{"rendered":"https:\/\/depts.washington.edu\/hortlib\/pal\/pal-question-464\/"},"modified":"2024-04-11T12:31:15","modified_gmt":"2024-04-11T19:31:15","slug":"managing-hemlock-woolly-adelgid","status":"publish","type":"pal","link":"https:\/\/depts.washington.edu\/hortlib\/pal\/managing-hemlock-woolly-adelgid\/","title":{"rendered":"Managing hemlock woolly adelgid"},"content":{"rendered":"<p><strong>My Western Hemlock is infested with woolly adelgid. Help! How can I save my tree?<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>The USDA Forest Service website<br \/>\nincludes information on different ways of managing the <a href=\"https:\/\/www.fs.fed.us\/research\/invasive-species\/insects\/hemlock-wooly-adelgid.php\">Hemlock woolly adelgid.<\/a><\/p>\n<p>The most effective approach is prevention, as treatment tends to be expensive<br \/>\nand is not always effective. <a href=\"https:\/\/extension.umd.edu\/resource\/hemlock-woolly-adelgid-trees\">Information<\/a> from University of Maryland Extension does describe the use of dormant oil spray in late winter and summer application of horticultural oil and<br \/>\ninsecticidal soap, but care must be taken to cover the entire tree. Also, it is<br \/>\nimportant to avoid the use of nitrogen-heavy fertilizers which create a lot of<br \/>\nsucculent new growth attractive to the pest.<\/p>\n<p>I recommend that you consult a certified arborist for advice on how to save your &lt;em?Tsuga heterophylla (Western hemlock). You can obtain<br \/>\nreferrals from <a href=\"https:\/\/www.plantamnesty.org\/services\/referral-services\/\">Plant Amnesty<\/a> or you can select an arborist from the directory of the <a href=\"https:\/\/online.flippingbook.com\/view\/871593\/\/\">Pacific Northwest Chapter of the International<br \/>\nSociety of Arboriculture.<\/a><\/p>\n<div class=\"taxonomy-keyword has-text-align-right wp-block-post-terms\"><a href=\"https:\/\/depts.washington.edu\/hortlib\/keyword\/trees-diseases-and-pests\/\" rel=\"tag\">Trees&#8211;Diseases and pests<\/a><span class=\"wp-block-post-terms__separator\">, <\/span><a href=\"https:\/\/depts.washington.edu\/hortlib\/keyword\/tsuga-heterophylla\/\" rel=\"tag\">Tsuga heterophylla<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>My Western Hemlock is infested with woolly adelgid. Help! How can I save my tree? &nbsp; The USDA Forest Service website includes information on different ways of managing the Hemlock woolly adelgid. The most effective approach is prevention, as treatment tends to be expensive and is not always effective. Information from University of Maryland Extension does describe the use of dormant oil spray in late winter and summer application of horticultural oil and insecticidal soap, but care must be taken&#8230;<\/p>\n<div><a class=\"more-link\" href=\"https:\/\/depts.washington.edu\/hortlib\/pal\/managing-hemlock-woolly-adelgid\/\">Continue reading <span class=\"screen-reader-text\">Managing hemlock woolly adelgid<\/span><\/a><\/div>\n","protected":false},"author":4,"featured_media":0,"menu_order":0,"template":"","keyword":[205,630],"class_list":["post-2675","pal","type-pal","status-publish","hentry","keyword-trees-diseases-and-pests","keyword-tsuga-heterophylla"],"acf":[],"_links":{"self":[{"href":"https:\/\/depts.washington.edu\/hortlib\/wp-json\/wp\/v2\/pal\/2675"}],"collection":[{"href":"https:\/\/depts.washington.edu\/hortlib\/wp-json\/wp\/v2\/pal"}],"about":[{"href":"https:\/\/depts.washington.edu\/hortlib\/wp-json\/wp\/v2\/types\/pal"}],"author":[{"embeddable":true,"href":"https:\/\/depts.washington.edu\/hortlib\/wp-json\/wp\/v2\/users\/4"}],"wp:attachment":[{"href":"https:\/\/depts.washington.edu\/hortlib\/wp-json\/wp\/v2\/media?parent=2675"}],"wp:term":[{"taxonomy":"keyword","embeddable":true,"href":"https:\/\/depts.washington.edu\/hortlib\/wp-json\/wp\/v2\/keyword?post=2675"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}