{"id":14255,"date":"2018-07-29T15:17:58","date_gmt":"2018-07-29T13:17:58","guid":{"rendered":"https:\/\/www.plantenplagen.nl\/plantenplagen\/rhododendron\/"},"modified":"2023-11-27T11:18:22","modified_gmt":"2023-11-27T10:18:22","slug":"rhododendron","status":"publish","type":"encyclopedia","link":"https:\/\/www.plantenplagen.nl\/en\/plantenplagen\/rhododendron\/","title":{"rendered":"Rhododendron"},"content":{"rendered":"<div class=\"wpb-content-wrapper\" id=\"wpb-content-root\"><p>[vc_row][vc_column width=&rdquo;2\/3&Prime;][vc_column_text el_id=&rdquo;topentry&rdquo; el_class=&rdquo;topentry&rdquo;]Rhododendron, light shade. Does not like wetness.<!--more-->[\/vc_column_text][\/vc_column][vc_column width=&rdquo;1\/3&Prime;][vc_column_text el_id=&rdquo;entrytxt&rdquo; el_class=&rdquo;entrytxt&rdquo;]<em>Also known as:<\/em><br>\nCatawba rosebay<br>\nMountain rosebay<br>\nPurple laurel<br>\nRosebay laurel[\/vc_column_text][\/vc_column][\/vc_row][vc_row content_placement=&rdquo;middle&rdquo; css=&rdquo;.vc_custom_1627123481876{padding-top: 0px !important;padding-right: 5px !important;padding-bottom: 0px !important;padding-left: 5px !important;background-color: #ccffff !important;border-radius: 20px !important;}&rdquo; el_id=&rdquo;mobile&rdquo;][vc_column offset=&rdquo;vc_hidden-lg vc_hidden-md vc_hidden-sm&rdquo;][vc_column_text css=&rdquo;.vc_custom_1627123409680{padding: 0px !important;border: 0px initial !important;}&rdquo; el_id=&rdquo;mobiel&rdquo;]<\/p>\n<p style=\"text-align: center;\"><span style=\"color: #000099;\">You are viewing the mobile-adapted version of the page.<\/span><br>\n<span style=\"color: #000099;\">The one for tablets, laptop and desktop also provides general information, such as origin, toxicity and cultivation.<\/span><\/p>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row gap=&rdquo;35&Prime; css=&rdquo;.vc_custom_1532162142715{background-color: #e6e6e6 !important;}&rdquo;][vc_column width=&rdquo;1\/2&Prime; offset=&rdquo;vc_hidden-xs&rdquo;][vc_single_image image=&rdquo;721&Prime; img_size=&rdquo;medium&rdquo; add_caption=&rdquo;yes&rdquo; style=&rdquo;vc_box_rounded&rdquo; onclick=&rdquo;img_link_large&rdquo;][vc_column_text el_id=&rdquo;entrytxt&rdquo; el_class=&rdquo;entrytxt&rdquo; css=&rdquo;.vc_custom_1552483204081{padding-left: 10px !important;}&rdquo;]<\/p>\n<ul>\n<li>Both the flowers, leaves and honey of the rhododendron are highly toxic; even to animals.<\/li>\n<\/ul>\n<p>[\/vc_column_text][\/vc_column][vc_column width=&rdquo;1\/2&Prime; css=&rdquo;.vc_custom_1649260503519{background-color: #e6e6e6 !important;}&rdquo; offset=&rdquo;vc_hidden-xs&rdquo;][vc_column_text el_id=&rdquo;topentry&rdquo; el_class=&rdquo;topentry&rdquo;]<em>Rhododendron catawbiense<\/em> is a species of <em>Rhododendron<\/em>. The plant is native to eastern North America. The species grows mainly in the Appalachian Mountains from Virginia in the north to Alabama in the south. In addition, the plant is found multiplying in the wild in a number of states. The species designation <em>catawbiense<\/em> comes from the Native American tribe <em>Catawba<\/em>. It is a dense shrub that usually grows up to 3 m tall, but under favorable conditions it can also grow up to 5 m tall. The plant is an evergreen. The leaves are 6-12 x 2-4 cm in size. The flowers are not particularly large. They are 3-4.5 cm in diameter and are purple in color, often with small dots or stripes. The fruit is a 1.5-2 cm capsule, which contains a large number of small seeds.[\/vc_column_text][\/vc_column][\/vc_row][vc_row equal_height=&rdquo;yes&rdquo;][vc_column width=&rdquo;1\/3&Prime;][vc_custom_heading text=&rdquo;Bugs&rdquo; font_container=&rdquo;tag:h4|text_align:center|color:%23ffffff&rdquo; google_fonts=&rdquo;font_family:Lato%3A100%2C100italic%2C300%2C300italic%2Cregular%2Citalic%2C700%2C700italic%2C900%2C900italic|font_style:400%20regular%3A400%3Anormal&rdquo; css=&rdquo;.vc_custom_1532164328547{background-color: #585858 !important;}&rdquo;][vc_column_text el_class=&rdquo;entrytxt&rdquo;]<\/p>\n<figure id=\"attachment_5475\" aria-describedby=\"caption-attachment-5475\" style=\"width: 424px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/plantenplagen.nl\/wp-content\/uploads\/Rododendron_lapsnuitkever.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5475 size-medium\" src=\"https:\/\/plantenplagen.nl\/wp-content\/uploads\/Rododendron_lapsnuitkever-424x500.jpg\" alt=\"recognize damage to rhododendron\" width=\"424\" height=\"500\" srcset=\"https:\/\/www.plantenplagen.nl\/wp-content\/uploads\/Rododendron_lapsnuitkever-424x500.jpg 424w, https:\/\/www.plantenplagen.nl\/wp-content\/uploads\/Rododendron_lapsnuitkever-868x1024.jpg 868w, https:\/\/www.plantenplagen.nl\/wp-content\/uploads\/Rododendron_lapsnuitkever-768x906.jpg 768w, https:\/\/www.plantenplagen.nl\/wp-content\/uploads\/Rododendron_lapsnuitkever-1302x1536.jpg 1302w, https:\/\/www.plantenplagen.nl\/wp-content\/uploads\/Rododendron_lapsnuitkever.jpg 1511w\" sizes=\"auto, (max-width: 424px) 100vw, 424px\"><\/a><figcaption id=\"caption-attachment-5475\" class=\"wp-caption-text\">Leaf damage by the Vi<wbr><\/wbr>ne weevil, photo: Cor van Gelderen<\/figcaption><\/figure>\n<p>Semicircular bites from the leaf margins, round holes in the leaf: <a href=\"https:\/\/www.plantenplagen.nl\/en\/plantenplagen\/vine-weevil\/\" target=\"_blank\" title='[vc_row][vc_column width=\"2\/3\"][vc_column_text el_id=\"topentry\" el_class=\"topentry\"]Vine weevil, this nearly 1 cm large dark gray weevil&nbsp;can be found on a wide range of ornamental plants. [\/vc_column_text][\/vc_column][vc_column width=\"1\/3\"][\/vc_column][\/vc_row][vc_row gap=\"35\" css=\".vc_custom_1532162142715{background-color: #e6e6e6 !important;}\"][vc_column width=\"1\/2\"][vc_single_image image=\"3599\" img_size=\"medium\" add_caption=\"yes\" style=\"vc_box_rounded\" onclick=\"img_link_large\"][\/vc_column][vc_column width=\"1\/2\" css=\".vc_custom_1532162092980{background-color: #e6e6e6 !important;}\"][vc_column_text el_class=\"entrytxt\"]Vine weevil (Otiorhynchus sulcatus). This nearly 1 cm large dark gray weevil&nbsp;can be found on a wide&hellip;' class=\"encyclopedia\">Vine weevil<\/a> <em>(Otiorhynchus sulcatus)<\/em>.[\/vc_column_text][\/vc_column][vc_column width=&rdquo;1\/3&Prime; css=&rdquo;.vc_custom_1532102781238{background-color: #ffffff !important;}&rdquo;][vc_custom_heading text=&rdquo;Fungi &amp; diseases&rdquo; font_container=&rdquo;tag:h4|text_align:center|color:%23ffffff&rdquo; google_fonts=&rdquo;font_family:Lato%3A100%2C100italic%2C300%2C300italic%2Cregular%2Citalic%2C700%2C700italic%2C900%2C900italic|font_style:400%20regular%3A400%3Anormal&rdquo; css=&rdquo;.vc_custom_1537888601742{background-color: #585858 !important;}&rdquo;][vc_column_text el_class=&rdquo;entrytxt&rdquo;]<\/p>\n<figure id=\"attachment_3611\" aria-describedby=\"caption-attachment-3611\" style=\"width: 500px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/plantenplagen.nl\/wp-content\/uploads\/VerdrKnoppenRodo_sm.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3611 size-medium\" src=\"https:\/\/plantenplagen.nl\/wp-content\/uploads\/VerdrKnoppenRodo_sm-500x333.jpg\" alt=\"\" width=\"500\" height=\"333\" srcset=\"https:\/\/www.plantenplagen.nl\/wp-content\/uploads\/VerdrKnoppenRodo_sm-500x333.jpg 500w, https:\/\/www.plantenplagen.nl\/wp-content\/uploads\/VerdrKnoppenRodo_sm-768x512.jpg 768w, https:\/\/www.plantenplagen.nl\/wp-content\/uploads\/VerdrKnoppenRodo_sm.jpg 1024w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\"><\/a><figcaption id=\"caption-attachment-3611\" class=\"wp-caption-text\">Withered bud, bud does not sprout, photo: Rob Tjalkens<\/figcaption><\/figure>\n<p>Buds do not sprout in spring; have decayed: <a href=\"https:\/\/www.plantenplagen.nl\/en\/plantenplagen\/rhododendron-blight\/\" target=\"_blank\" title='[vc_row][vc_column width=\"2\/3\"][vc_column_text el_id=\"topentry\" el_class=\"topentry\"]Rhododendron Blight is caused by a fungus: flower buds do not open, turn brown and rot under the influence of rain. [\/vc_column_text][\/vc_column][vc_column width=\"1\/3\"][vc_column_text el_id=\"entrytxt\" el_class=\"entrytxt\" css=\".vc_custom_1679649532912{padding-left: 20px !important;}\"]Also known as: Bud blast Do not confuse with: Frost damage of the buds[\/vc_column_text][\/vc_column][\/vc_row][vc_row gap=\"35\" css=\".vc_custom_1532162142715{background-color: #e6e6e6 !important;}\"][vc_column width=\"1\/2\"][vc_single_image image=\"3609\" img_size=\"medium\" add_caption=\"yes\" style=\"vc_box_rounded\" onclick=\"img_link_large\"][\/vc_column][vc_column width=\"1\/2\"&hellip;' class=\"encyclopedia\">Rhododendron Blight<\/a> <em>(Pycnostysanus azaleae).<\/em><\/p>\n<figure id=\"attachment_3593\" aria-describedby=\"caption-attachment-3593\" style=\"width: 500px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/plantenplagen.nl\/wp-content\/uploads\/rododendron_phytophthora.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-3593\" src=\"https:\/\/plantenplagen.nl\/wp-content\/uploads\/rododendron_phytophthora-500x483.jpg\" alt=\"\" width=\"500\" height=\"483\" srcset=\"https:\/\/www.plantenplagen.nl\/wp-content\/uploads\/rododendron_phytophthora-500x483.jpg 500w, https:\/\/www.plantenplagen.nl\/wp-content\/uploads\/rododendron_phytophthora.jpg 723w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\"><\/a><figcaption id=\"caption-attachment-3593\" class=\"wp-caption-text\">Phytoph<wbr><\/wbr>thora root rot, photo: Jay W. Pscheidt<\/figcaption><\/figure>\n<p>Shrub lags in growth, leaves curl, turn yellow or red, bark at base of plant turns brownish red. The roots show the same discoloration: Root rot <em>(<a href=\"https:\/\/www.plantenplagen.nl\/en\/plantenplagen\/phytophthora\/\" target=\"_blank\" title='[vc_row][vc_column width=\"2\/3\"][vc_column_text el_id=\"topentry\" el_class=\"topentry\"]Phytophthora recognizable by the black spots in on the foliage of potatoes and tomatoes. [\/vc_column_text][\/vc_column][vc_column width=\"1\/3\"][vc_column_text el_id=\"entrytxt\" el_class=\"entrytxt\" css=\".vc_custom_1702811307671{padding-left: 20px !important;}\"]Also known as: Pink rot (potato, carrot) Late Blight (potato, tomato) Phytophthora root rot (rhododendrons, azaleas, rose)[\/vc_column_text][\/vc_column][\/vc_row][vc_row gap=\"35\" css=\".vc_custom_1532162142715{background-color: #e6e6e6 !important;}\"][vc_column width=\"1\/2\"][vc_single_image image=\"1301\" img_size=\"medium\" add_caption=\"yes\" style=\"vc_box_rounded\" onclick=\"img_link_large\"][\/vc_column][vc_column width=\"1\/2\" css=\".vc_custom_1532162092980{background-color: #e6e6e6 !important;}\"][vc_column_text el_class=\"entrytxt\"]Phytophthora&hellip;' class=\"encyclopedia\">Phytophthora<\/a>)<\/em>.<\/p>\n<p>Lower leaves of the rhododendron show yellow spots, which then turn red and dark brown. The leaf veins border the spots. Leaf falls early. Spore-forming fungal spots develop on the spots: <a href=\"https:\/\/www.plantenplagen.nl\/en\/plantenplagen\/septoria-blight\/\" target=\"_blank\" title='[vc_row][vc_column width=\"2\/3\"][vc_column_text el_id=\"topentry\" el_class=\"topentry\"]Septoria blight survives on seed. Infection occurs during periods of warm and humid weather (late summer, early fall). [\/vc_column_text][\/vc_column][vc_column width=\"1\/3\"][vc_column_text el_id=\"entrytxt\" el_class=\"entrytxt\" css=\".vc_custom_1701079830023{padding-left: 20px !important;}\"]Also known as: Septoria spot Septoria leaf spot Not to be confused with: Septoria leaf blotch (Zymoseptoria tritici)[\/vc_column_text][\/vc_column][\/vc_row][vc_row gap=\"35\" css=\".vc_custom_1532162142715{background-color: #e6e6e6 !important;}\"][vc_column width=\"1\/2\"][vc_single_image image=\"2525\" img_size=\"medium\" add_caption=\"yes\" style=\"vc_box_rounded\" onclick=\"img_link_large\"][\/vc_column][vc_column&hellip;' class=\"encyclopedia\">Septoria blight<\/a> <em>(Septoria spp)<\/em>.<\/p>\n<p><a href=\"https:\/\/www.plantenplagen.nl\/wp-content\/uploads\/Sudden_Oak_Death.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"206\" class=\"wp-image-11731 size-full\" src=\"https:\/\/www.plantenplagen.nl\/wp-content\/uploads\/Sudden_Oak_Death.jpg\" alt='\"recognize'><\/a><\/p>\n<p>Twigs turn brown, later black and die. Sharply defined brown spots develop on leaves; leaves droop and fall off prematurely (extreme leaf loss): <a href=\"https:\/\/www.plantenplagen.nl\/en\/plantenplagen\/phytophthora-ramorum\/\" target=\"_blank\" title='[vc_row][vc_column width=\"2\/3\"][vc_column_text el_id=\"topentry\" el_class=\"topentry\"]Phytophthora ramorum causes SOD (Sudden Oak Death). [\/vc_column_text][\/vc_column][vc_column width=\"1\/3\"][vc_column_text el_id=\"entrytxt\" el_class=\"entrytxt\" css=\".vc_custom_1665497293112{padding-left: 20px !important;}\"]Also known as: SOD (Sudden Oak Death).[\/vc_column_text][\/vc_column][\/vc_row][vc_row gap=\"35\" css=\".vc_custom_1532162142715{background-color: #e6e6e6 !important;}\"][vc_column width=\"1\/2\"][vc_single_image image=\"11723\" img_size=\"medium\" add_caption=\"yes\" style=\"vc_box_rounded\" onclick=\"img_link_large\"][\/vc_column][vc_column width=\"1\/2\" css=\".vc_custom_1532162092980{background-color: #e6e6e6 !important;}\"][vc_column_text el_class=\"entrytxt\"]Phytophthora ramorum belongs to fungus-like microorganisms (Oomycetes) and causes SOD (Sudden Oak Death). SOD has caused major damage&hellip;' class=\"encyclopedia\">Phytophthora ramorum<\/a>.<\/p>\n<p>Leaves take on a silvery sheen: <a href=\"https:\/\/www.plantenplagen.nl\/en\/plantenplagen\/silver-leaf\/\" target=\"_blank\" title='[vc_row][vc_column width=\"2\/3\"][vc_column_text el_id=\"topentry\" el_class=\"topentry\"]Silver leaf is caused by the purple lichen fungus that gives the leaves of prunus species the characteristic silvery sheen when damaged. [\/vc_column_text][\/vc_column][vc_column width=\"1\/3\"][\/vc_column][\/vc_row][vc_row gap=\"35\" css=\".vc_custom_1532162142715{background-color: #e6e6e6 !important;}\"][vc_column width=\"1\/2\"][vc_single_image image=\"2299\" img_size=\"medium\" add_caption=\"yes\" style=\"vc_box_rounded\" onclick=\"img_link_large\"][\/vc_column][vc_column width=\"1\/2\" css=\".vc_custom_1532162092980{background-color: #e6e6e6 !important;}\"][vc_column_text el_class=\"entrytxt\"]Silver leaf (Chondrostereum purpureum). Purple lichen fungus that gives the leaves of prunus species&hellip;' class=\"encyclopedia\">silver leaf<\/a> <em>(Chondrostereum purpureum)<\/em>.[\/vc_column_text][\/vc_column][vc_column width=&rdquo;1\/3&Prime; css=&rdquo;.vc_custom_1532102799994{background-color: #ffffff !important;}&rdquo;][vc_custom_heading text=&rdquo;Other&rdquo; font_container=&rdquo;tag:h4|text_align:center|color:%23ffffff&rdquo; google_fonts=&rdquo;font_family:Lato%3A100%2C100italic%2C300%2C300italic%2Cregular%2Citalic%2C700%2C700italic%2C900%2C900italic|font_style:400%20regular%3A400%3Anormal&rdquo; css=&rdquo;.vc_custom_1532164377225{background-color: #585858 !important;}&rdquo;][vc_column_text el_id=&rdquo;entrytxt&rdquo; el_class=&rdquo;entrytxt&rdquo;]Lower leaves turn yellow: dogs urinate against the bush causing urine damage to the leaves.<\/p>\n<p>Rhododendron languishes: shrub gets shaded by neighboring fast growers.<\/p>\n<p>Leaves yellow; veins remain green: at a <a href=\"https:\/\/www.plantenplagen.nl\/en\/files\/glossary\/\" target=\"_blank\" rel=\"noopener noreferrer\">pH<\/a> higher than 5.5 (normal is a pH of 7), the plant becomes iron deficient. Occurs mainly on young plants, especially from the lower leaves. Rhododendrons thrive best in acidic soil with a pH of 5. Peat litter and coffee grounds lower pH.[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"author":14,"template":"","categories":[],"tags":[],"encyclopedia-category":[667],"encyclopedia-tag":[],"class_list":["post-14255","encyclopedia","type-encyclopedia","status-publish","hentry","encyclopedia-category-ornamental-garden"],"_links":{"self":[{"href":"https:\/\/www.plantenplagen.nl\/en\/wp-json\/wp\/v2\/encyclopedia\/14255","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.plantenplagen.nl\/en\/wp-json\/wp\/v2\/encyclopedia"}],"about":[{"href":"https:\/\/www.plantenplagen.nl\/en\/wp-json\/wp\/v2\/types\/encyclopedia"}],"author":[{"embeddable":true,"href":"https:\/\/www.plantenplagen.nl\/en\/wp-json\/wp\/v2\/users\/14"}],"wp:attachment":[{"href":"https:\/\/www.plantenplagen.nl\/en\/wp-json\/wp\/v2\/media?parent=14255"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.plantenplagen.nl\/en\/wp-json\/wp\/v2\/categories?post=14255"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.plantenplagen.nl\/en\/wp-json\/wp\/v2\/tags?post=14255"},{"taxonomy":"encyclopedia-category","embeddable":true,"href":"https:\/\/www.plantenplagen.nl\/en\/wp-json\/wp\/v2\/encyclopedia-category?post=14255"},{"taxonomy":"encyclopedia-tag","embeddable":true,"href":"https:\/\/www.plantenplagen.nl\/en\/wp-json\/wp\/v2\/encyclopedia-tag?post=14255"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}