{"id":2691,"date":"2019-11-14T00:03:39","date_gmt":"2019-11-14T08:03:39","guid":{"rendered":"https:\/\/depts.washington.edu\/hortlib\/pal\/pal-question-479\/"},"modified":"2023-08-08T14:29:25","modified_gmt":"2023-08-08T21:29:25","slug":"managing-lilacs-with-bacterial-blight","status":"publish","type":"pal","link":"https:\/\/depts.washington.edu\/hortlib\/pal\/managing-lilacs-with-bacterial-blight\/","title":{"rendered":"managing lilacs with bacterial blight"},"content":{"rendered":"<p><strong>I have a &#8216;Palibin&#8217; lilac that appears to have a bit of bacterial<\/strong><br \/>\n<strong>blight. I have pruned out the diseased branches. Is it too late to<\/strong><br \/>\n<strong>spray to control the disease? I didn&#8217;t do a dormant spray this year,<\/strong><br \/>\n<strong>and haven&#8217;t done any preventive spraying to this point, either. If it<\/strong><br \/>\n<strong>isn&#8217;t too late, what spray product would you recommend? What else can I do to keep the blight under control?<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>There are cultural methods of dealing with bacterial blight you should try before using any spray. The information below should help.<\/p>\n<p>Washington State University Extension&#8217;s <a href=\"http:\/\/hortsense.cahnrs.wsu.edu\/Search\/MainMenuWithFactSheet.aspx?CategoryId=1&amp;SubCatId=4&amp;PlantDefId=21&amp;ProblemId=433\">HortSense website<\/a> recommends:<\/p>\n<ul>\n<li>Avoid injuring plants to reduce possibility of infection.<\/li>\n<li>Avoid overhead irrigation.<\/li>\n<li>Maintain proper plant nutrition. Healthy plants resist disease better.<\/li>\n<li>Plant disease-resistant species such as <i>Syringa perkinensis<\/i>, <i>S. microphylla<\/i>, or <i>S. vulgaris<\/i> vars. &#8216;Alphonse Lavallec&#8217;, &#8216;Crepuscule&#8217;, &#8216;Floreal&#8217;, &#8216;Guinevere&#8217;, &#8216;Jeanne d&#8217;Art&#8217;, &#8216;Lutece&#8217;, &#8216;Maud Notcutt&#8217;, &#8216;Mrs. W.W. Marshall&#8217;, &#8216;Rutilant&#8217;, or &#8216;William Robinson&#8217;.<\/li>\n<li>Prune and destroy infected tissues as soon as they are noticed.<\/li>\n<li>Space plants properly and prune to provide good air circulation. This will slow down spread of the disease.<\/li>\n<\/ul>\n<p>Here is more information from <a href=\"http:\/\/ipm.ucanr.edu\/PMG\/GARDEN\/PLANTS\/DISEASES\/baclfblight.html\">University of California, Davis&#8217;s<br \/>\nIntegrated Pest Management site.<\/a> Excerpt:<\/p>\n<p>&#8220;Bacterial blight is promoted by prolonged rainy springs. Symptoms may be<br \/>\nmore extensive in wetter areas. Prune branches showing dieback and severe<br \/>\nblight. Space plants to provide good air circulation. Prune during the<br \/>\ndry season when infection is less likely to occur. Do not wet foliage<br \/>\nwith overhead irrigation; do not overfertilize. Small plants can be<br \/>\nprotected to some degree by keeping them covered by plastic (or moved<br \/>\nunder plastic). Plant resistant species if available. If the disease is<br \/>\nsystemic or cankers appear on the trunk, the tree will probably die and<br \/>\nshould be removed. If the disease is confined to leaves, damage is not<br \/>\nusually serious and trees normally recover. Sprays do not give reliable<br \/>\ncontrol.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I have a &#8216;Palibin&#8217; lilac that appears to have a bit of bacterial blight. I have pruned out the diseased branches. Is it too late to spray to control the disease? I didn&#8217;t do a dormant spray this year, and haven&#8217;t done any preventive spraying to this point, either. If it isn&#8217;t too late, what spray product would you recommend? What else can I do to keep the blight under control? &nbsp; There are cultural methods of dealing with bacterial&#8230;<\/p>\n<div><a class=\"more-link\" href=\"https:\/\/depts.washington.edu\/hortlib\/pal\/managing-lilacs-with-bacterial-blight\/\">Continue reading <span class=\"screen-reader-text\">managing lilacs with bacterial blight<\/span><\/a><\/div>\n","protected":false},"author":4,"featured_media":0,"menu_order":0,"template":"","keyword":[646,234],"class_list":["post-2691","pal","type-pal","status-publish","hentry","keyword-bacterial-diseases-of-plants","keyword-syringa"],"acf":[],"_links":{"self":[{"href":"https:\/\/depts.washington.edu\/hortlib\/wp-json\/wp\/v2\/pal\/2691"}],"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=2691"}],"wp:term":[{"taxonomy":"keyword","embeddable":true,"href":"https:\/\/depts.washington.edu\/hortlib\/wp-json\/wp\/v2\/keyword?post=2691"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}