{"id":3355,"date":"2019-06-17T13:56:31","date_gmt":"2019-06-17T17:56:31","guid":{"rendered":"http:\/\/blog.uvm.edu\/hoppenin\/?p=3355"},"modified":"2019-06-17T13:56:31","modified_gmt":"2019-06-17T17:56:31","slug":"scouting-for-downy-mildew","status":"publish","type":"post","link":"https:\/\/blog.uvm.edu\/hoppenin\/2019\/06\/17\/scouting-for-downy-mildew\/","title":{"rendered":"Scouting for Downy Mildew"},"content":{"rendered":"\n

Scouting for downy mildew in the hop yard. Now that the growing season is underway, it is important to be on the lookout for downy mildew! This spring has been very rainy, and the excess moisture on the hop plants creates ideal conditions for downy mildew infections. Downy mildew produces spores in warm, moist conditions and can spread quickly.  Plants are at a higher risk during rainy days because the plant\u2019s stomata, or pores, are open, leaving an open pathway for disease invasion. <\/p>\n\n\n\n

Downy mildew is a systemic infection which means that once a\nplant has downy mildew, it is infected for life. At the end of the growing\nseason, downy mildew will over winter in the crown of the infected hop plant,\nand re-emerge in the spring. <\/p>\n\n\n\n

\"\"
Infected leaf with downy mildew.<\/figcaption><\/figure><\/div>\n\n\n\n

When scouting your\nhop yard, the first signs of a downy mildew infection are the basal spikes. Basal\nspikes are chlorotic, or yellowing, and have shortened internodes, or the space\nbetween leaf pairs. A severely infected basal spike may also have desiccated\nleaves. <\/p>\n\n\n\n

Other signs of a downy\nmildew infection are aerial spikes and infected leaves, which will begin to\nappear as the season progresses. Aerial spikes have the same chlorotic\nappearance and short internodes as basal spikes, except they\u2019re found on a trained\nplant rather than on the ground. Infected leaves have necrotic lesions,\ndelineated by leaf veins. These lesions are angular and have very distinct\nedges, which can help with disease identification. <\/p>\n\n\n\n

\"\"
Downy mildew on basal spikes. <\/figcaption><\/figure><\/div>\n\n\n\n

Downy mildew can be managed and\nthere are methods to prevent the spread of infection. When scouting plants, it\nis important to trim off the infected bines and leaves, and to make sure that\ninfected plant material is removed from the hop yard. If infected leaves have\nspores, be careful while handling them to reduce the risk of spreading\ninfection. <\/p>\n\n\n\n

Increased airflow is another way to reduce downy mildew. It\nreduces the amount of time your foliage spends wet, which decreases the time\nthat downy mildew is producing spores. Stripping the lower 2 to 4 feet of\nfoliage once a plant is trained and established can reduce moisture. <\/p>\n\n\n\n

Biofungicides are another helpful tool to use during the\nseason to control downy mildew, and they can be applied the day before a rain\nevent. There are a variety of conventional and organic fungicides registered\nfor hop use. If you live in Vermont, a list of OMRI-approved biofungicides can\nbe found in the 2016\nHop Biofungicide Trial Research Report<\/a>. \nIt is very important to only apply fungicides that are listed in your\nstate for use on hops so be sure to check the label.<\/p>\n","protected":false},"excerpt":{"rendered":"

Scouting for downy mildew in the hop yard. Now that the growing season is underway, it is important to be on the lookout for downy mildew! This spring has been very rainy, and the excess moisture on the hop plants creates ideal conditions for downy mildew infections. Downy mildew produces spores in warm, moist conditions … <\/p>\n

Continue reading “Scouting for Downy Mildew”<\/span><\/a><\/p>\n","protected":false},"author":1000,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3355","post","type-post","status-publish","format-standard","hentry","category-uncategorized","entry"],"featured_image_src":null,"featured_image_src_square":null,"author_info":{"display_name":"hoppenin","author_link":"https:\/\/blog.uvm.edu\/hoppenin\/author\/hoppenin\/"},"_links":{"self":[{"href":"https:\/\/blog.uvm.edu\/hoppenin\/wp-json\/wp\/v2\/posts\/3355","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.uvm.edu\/hoppenin\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.uvm.edu\/hoppenin\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.uvm.edu\/hoppenin\/wp-json\/wp\/v2\/users\/1000"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.uvm.edu\/hoppenin\/wp-json\/wp\/v2\/comments?post=3355"}],"version-history":[{"count":3,"href":"https:\/\/blog.uvm.edu\/hoppenin\/wp-json\/wp\/v2\/posts\/3355\/revisions"}],"predecessor-version":[{"id":3360,"href":"https:\/\/blog.uvm.edu\/hoppenin\/wp-json\/wp\/v2\/posts\/3355\/revisions\/3360"}],"wp:attachment":[{"href":"https:\/\/blog.uvm.edu\/hoppenin\/wp-json\/wp\/v2\/media?parent=3355"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.uvm.edu\/hoppenin\/wp-json\/wp\/v2\/categories?post=3355"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.uvm.edu\/hoppenin\/wp-json\/wp\/v2\/tags?post=3355"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}