{"id":20693,"date":"2022-09-14T11:24:23","date_gmt":"2022-09-14T15:24:23","guid":{"rendered":"https:\/\/extension.umaine.edu\/gardening\/?p=20693"},"modified":"2022-09-14T11:26:38","modified_gmt":"2022-09-14T15:26:38","slug":"birch-that-has-leaves-with-bumps-and-turning-black","status":"publish","type":"post","link":"https:\/\/extension.umaine.edu\/gardening\/2022\/09\/14\/birch-that-has-leaves-with-bumps-and-turning-black\/","title":{"rendered":"What can be done for a birch that has leaves with bumps and turning black?"},"content":{"rendered":"

Question:<\/h3>\n

My question is about a Fox Valley Dwarf River Birch.\u00a0 \u00a0In 2021, we noticed bumps on the leaves. We went to nursery and it was suggested we use a systemic product which we did. Bumps remained but the tree continued to thrive. This year, the bumps came back immediately. We again asked from the nursery what to do. We were told once the bumps appeared, there was nothing we could do and it would not hurt the tree.\u00a0 <\/b>Again, the tree grew and thrived.<\/b>
\nNow, tree is loaded with the bumps and some turning black. What to do?<\/b><\/p>\n

Answer:<\/h3>\n
Lynne M. Holland, Horticulture and Social Media Professional <\/em><\/div>\n

That certainly sounds frustrating and it seems to be progressing.\u00a0 Without a picture it is hard to diagnose, however please look at the\u00a0picture on this page<\/a>\u00a0and let me know if this is what you are seeing on your tree.\u00a0 If it is then what you have are leaf galls.\u00a0 There is an expert explanation on that page is this is what you have.<\/p>\n

It is true that once you see the bumps there is little you can do for the leaves that season.\u00a0 It is also true that the galls do not hurt the tree, they are the tree’s defense against an invader.\u00a0 Identification of that invader should be done by an arborist in the spring and then perhaps a spray or dormant oil can be used but there are risks with any application of anything to a tree.<\/p>\n

The galls tuning black indicate that the invader may be an aphid that produces “honey do” which then attracts a fungus or bacteria. That would be considered a secondary infection.\u00a0 But again without a picture that is just a guess.<\/p>\n

I suggest reaching out to the nursery one more time and bring in a sample branch (or part of a branch) and ask them for an expert to determine what the invader is that is causing the tree to produce galls.\u00a0 Then see if they recommend an arborist for preventative application next spring.\u00a0 This season clean up all affected leaves and remove them from the area.\u00a0 Pay close attention to the bark and branches of the tree in the early spring to see if there is an adult insect laying eggs on the budding leaves.<\/p>\n","protected":false},"excerpt":{"rendered":"

Question: My question is about a Fox Valley Dwarf River Birch.\u00a0 \u00a0In 2021, we noticed bumps on the leaves. We went to nursery and it was suggested we use a systemic product which we did. Bumps remained but the tree continued to thrive. This year, the bumps came back immediately. We again asked from the […]<\/p>\n","protected":false},"author":53,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[199,204],"tags":[],"class_list":["post-20693","post","type-post","status-publish","format-standard","hentry","category-ask","category-pests"],"yoast_head":"\nWhat can be done for a birch that has leaves with bumps and turning black? - Cooperative Extension: Garden and Yard - University of Maine Cooperative Extension<\/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:\/\/extension.umaine.edu\/gardening\/2022\/09\/14\/birch-that-has-leaves-with-bumps-and-turning-black\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What can be done for a birch that has leaves with bumps and turning black? - Cooperative Extension: Garden and Yard - University of Maine Cooperative Extension\" \/>\n<meta property=\"og:description\" content=\"Question: My question is about a Fox Valley Dwarf River Birch.\u00a0 \u00a0In 2021, we noticed bumps on the leaves. 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