{"id":3357,"date":"2019-06-08T00:14:45","date_gmt":"2019-06-08T07:14:45","guid":{"rendered":"https:\/\/depts.washington.edu\/hortlib\/pal\/pal-question-1008\/"},"modified":"2023-08-04T13:40:54","modified_gmt":"2023-08-04T20:40:54","slug":"nail-galls-and-other-plant-galls","status":"publish","type":"pal","link":"https:\/\/depts.washington.edu\/hortlib\/pal\/nail-galls-and-other-plant-galls\/","title":{"rendered":"nail galls and other plant galls"},"content":{"rendered":"<p><strong>On my walk this morning, I saw bizarre lipstick-red protrusions on leaves near the bottom of the tree, where bright green new shoots had sprouted. The tree had kind of sticky heart-shaped leaves, some of them about the size of the palm of my hand. Are these insects? A fungus or disease?<\/strong><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/depts.washington.edu\/hortlib\/graphix\/Tiliagall.jpg\" alt=\"[Tiliagall] cover\" \/><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: left;\">Your photos show new growth on a linden tree, possibly large-leaved linden (<em>Tilia platyphyllos<\/em>). The red things are called nail galls (<em>Eriophyaes tilia<\/em>) and they are caused by the <a href=\"https:\/\/www.inaturalist.org\/taxa\/319872-Eriophyes-tiliae\">red nail gall mite.<\/a><\/p>\n<p>According to Margaret Redfern&#8217;s book <a href=\"http:\/\/hortlib.kohacatalog.com\/cgi-bin\/koha\/opac-detail.pl?biblionumber=14821\"><em>Plant Galls<\/em><\/a>, this type of gall (in the form of a pouch) is &#8220;initiated in the spring by the fundatrices, females that have overwintered in cracks and crevices in the bark or under the scales of dormant buds.&#8221; The mite will wander over a new leaf&#8217;s underside and feed on individual cells which then collapse and die. The leaf domes up into a pointed pouch around that area. When the pouch is partly formed, the female mite lays her eggs inside it. The larvae hatch and feed there. <em>Tilia<\/em> nail galls have a thick nutritive layer, and each gall can contain 100-200 mites by summer. In fall, they disperse and overwinter.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>On my walk this morning, I saw bizarre lipstick-red protrusions on leaves near the bottom of the tree, where bright green new shoots had sprouted. The tree had kind of sticky heart-shaped leaves, some of them about the size of the palm of my hand. Are these insects? A fungus or disease? &nbsp; Your photos show new growth on a linden tree, possibly large-leaved linden (Tilia platyphyllos). The red things are called nail galls (Eriophyaes tilia) and they are caused&#8230;<\/p>\n<div><a class=\"more-link\" href=\"https:\/\/depts.washington.edu\/hortlib\/pal\/nail-galls-and-other-plant-galls\/\">Continue reading <span class=\"screen-reader-text\">nail galls and other plant galls<\/span><\/a><\/div>\n","protected":false},"author":12,"featured_media":0,"menu_order":0,"template":"","keyword":[996,1027],"class_list":["post-3357","pal","type-pal","status-publish","hentry","keyword-galls","keyword-tilia"],"acf":[],"_links":{"self":[{"href":"https:\/\/depts.washington.edu\/hortlib\/wp-json\/wp\/v2\/pal\/3357"}],"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\/12"}],"wp:attachment":[{"href":"https:\/\/depts.washington.edu\/hortlib\/wp-json\/wp\/v2\/media?parent=3357"}],"wp:term":[{"taxonomy":"keyword","embeddable":true,"href":"https:\/\/depts.washington.edu\/hortlib\/wp-json\/wp\/v2\/keyword?post=3357"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}