{"id":214,"date":"2026-02-27T21:39:51","date_gmt":"2026-02-27T21:39:51","guid":{"rendered":"https:\/\/www.coltivobio.com\/en\/?p=214"},"modified":"2026-03-04T19:54:58","modified_gmt":"2026-03-04T19:54:58","slug":"rose-powdery-mildew","status":"publish","type":"post","link":"https:\/\/www.coltivobio.com\/en\/rose-powdery-mildew\/","title":{"rendered":"Rose powdery mildew"},"content":{"rendered":"<p data-start=\"125\" data-end=\"548\"><strong data-start=\"128\" data-end=\"548\">Rose powdery mildew (white mildew) is a disease caused by the fungus <em data-start=\"199\" data-end=\"221\">Sphaerotheca pannosa<\/em> var. <em data-start=\"227\" data-end=\"234\">rosae<\/em>. If not treated, this plant disease can cause serious aesthetic damage to rose plants. In the following technical guide we will see how to identify the symptoms and how to treat rose powdery mildew using natural remedies. At the end of the article you will find a list of natural products to fight this disease.<\/strong><\/p>\n<h2 data-start=\"810\" data-end=\"868\"><strong data-start=\"813\" data-end=\"868\">What is rose powdery mildew and how to recognize it<\/strong><\/h2>\n<p data-start=\"870\" data-end=\"1164\">Rose powdery mildew (also called white mildew) is a fungal disease caused by <em data-start=\"947\" data-end=\"969\">Sphaerotheca pannosa<\/em> var. <em data-start=\"975\" data-end=\"982\">rosae<\/em>, affecting roses and several plants belonging to the Rosaceae family. Together with black spot (see here) and downy mildew (see here), it is one of the three main diseases of roses.<\/p>\n<p data-start=\"1166\" data-end=\"1752\">Powdery mildew appears on green plant parts as a white mycelial coating, similar to mold, initially accompanied by discoloration of the affected tissue (see photo above). In advanced stages, the mycelial growth becomes denser and spreads over increasingly large areas. Besides leaves, flower buds and young shoots are also affected (see photos below). In the final stage of the disease, affected parts dry out or remain severely deformed, resulting in aesthetic damage and reduced flowering. In highly susceptible rose varieties, damage caused by powdery mildew can be extremely severe.<\/p>\n<div id='gallery-2' class='gallery galleryid-214 gallery-columns-2 gallery-size-medium'><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon portrait'>\n\t\t\t\t<a href='https:\/\/www.coltivobio.com\/powdery-mildew\/'><img loading=\"lazy\" decoding=\"async\" width=\"364\" height=\"462\" src=\"https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2026\/02\/powdery-mildew-364x462.jpg\" class=\"attachment-medium size-medium\" alt=\"\" aria-describedby=\"gallery-2-7344\" srcset=\"https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2026\/02\/powdery-mildew-364x462.jpg 364w, https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2026\/02\/powdery-mildew-354x450.jpg 354w, https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2026\/02\/powdery-mildew.jpg 768w\" sizes=\"auto, (max-width: 364px) 100vw, 364px\" \/><\/a>\n\t\t\t<\/div>\n\t\t\t\t<figcaption class='wp-caption-text gallery-caption' id='gallery-2-7344'>\n\t\t\t\tYoung shoot affected by powdery mildew\n\t\t\t\t<\/figcaption><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon portrait'>\n\t\t\t\t<a href='https:\/\/www.coltivobio.com\/rose-powdery-mildew\/'><img loading=\"lazy\" decoding=\"async\" width=\"347\" height=\"462\" src=\"https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2026\/02\/rose-powdery-mildew-347x462.jpg\" class=\"attachment-medium size-medium\" alt=\"\" aria-describedby=\"gallery-2-7345\" srcset=\"https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2026\/02\/rose-powdery-mildew-347x462.jpg 347w, https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2026\/02\/rose-powdery-mildew-338x450.jpg 338w, https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2026\/02\/rose-powdery-mildew.jpg 768w\" sizes=\"auto, (max-width: 347px) 100vw, 347px\" \/><\/a>\n\t\t\t<\/div>\n\t\t\t\t<figcaption class='wp-caption-text gallery-caption' id='gallery-2-7345'>\n\t\t\t\tFlower bud with severe infection\n\t\t\t\t<\/figcaption><\/figure>\n\t\t<\/div>\n\n<h2 data-start=\"1759\" data-end=\"1805\"><strong data-start=\"1762\" data-end=\"1805\">Biological cycle of rose powdery mildew<\/strong><\/h2>\n<p data-start=\"1807\" data-end=\"2079\">As with most powdery mildew diseases, temperature plays a key role in disease development. Rose powdery mildew develops most actively at temperatures between <strong data-start=\"1965\" data-end=\"1977\">20\u201325 \u00b0C<\/strong> combined with high relative humidity. Temperatures above this range tend to slow disease progression.<\/p>\n<p data-start=\"2081\" data-end=\"2368\">The disease spreads through the release of <strong data-start=\"2124\" data-end=\"2135\">conidia<\/strong> (dispersal spores). The white mycelial growth produces large quantities of these spores. During winter, the fungus survives as <strong data-start=\"2263\" data-end=\"2280\">cleistothecia<\/strong> (survival structures) or as overwintering mycelium on plant residues or among the buds.<\/p>\n<figure id=\"attachment_7346\" aria-describedby=\"caption-attachment-7346\" style=\"width: 323px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-7346 size-medium\" src=\"https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2026\/02\/rose-powdery-mildew-on-leaf-323x462.jpg\" alt=\"Rose leaf with severe powdery mildew infection\" width=\"323\" height=\"462\" srcset=\"https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2026\/02\/rose-powdery-mildew-on-leaf-323x462.jpg 323w, https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2026\/02\/rose-powdery-mildew-on-leaf-314x450.jpg 314w, https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2026\/02\/rose-powdery-mildew-on-leaf.jpg 768w\" sizes=\"auto, (max-width: 323px) 100vw, 323px\" \/><figcaption id=\"caption-attachment-7346\" class=\"wp-caption-text\">Rose leaf with severe powdery mildew infection<\/figcaption><\/figure>\n<div class=\"vlp-link-container vlp-layout-basic\"><a href=\"https:\/\/www.coltivobio.com\/en\/rose-downy-mildew\/\" class=\"vlp-link\" title=\"See also: Rose downy mildew\"><\/a><div class=\"vlp-layout-zone-side\"><div class=\"vlp-block-2 vlp-link-image\"><img loading=\"lazy\" decoding=\"async\" style=\"max-width: 150px;\" width=\"150\" height=\"55\" src=\"https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2020\/04\/peronospora-rosa-sintomi.jpg\" class=\"attachment-150x999 size-150x999\" alt=\"\" \/><\/div><\/div><div class=\"vlp-layout-zone-main\"><div class=\"vlp-block-0 vlp-link-title\">See also: <a href=\"https:\/\/www.coltivobio.com\/en\/rose-downy-mildew\/\">Rose downy mildew<\/a><\/div><div class=\"vlp-block-1 vlp-link-summary\">Rose downy mildew is a disease caused by the fungus Peronospora sparsa. Under favorable climatic conditions, this disease can cause severe damage to rose cultivation and may also affect blackberry and raspberry. <\/div><\/div><\/div>\n<h2 data-start=\"2375\" data-end=\"2443\"><strong data-start=\"2378\" data-end=\"2443\">How to treat and prevent powdery mildew\u00a0<\/strong><\/h2>\n<p data-start=\"2445\" data-end=\"2959\">It is difficult to control this disease through agronomic practices alone. Good practice includes removing fallen leaves, including those from the previous season, since the overwintering mycelium survives in plant debris. During winter pruning, stems that showed symptoms in the previous year should be removed, as the fungus may survive in buds and initiate new infections in spring. During green pruning, heavily infected stems and green parts should also be removed and destroyed or taken away from the garden.<\/p>\n<p data-start=\"2961\" data-end=\"3191\">Direct control mainly relies on treatments with specific active substances. Preventive treatments with <a href=\"https:\/\/www.coltivobio.com\/en\/correct-use-of-sulfur-fungicide-in-agriculture\/\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"3064\" data-end=\"3074\">sulfur<\/strong><\/a> remain one of the main methods for containing the disease and should be applied at the first appearance of symptoms.<\/p>\n<p data-start=\"3193\" data-end=\"3368\">Treatments based on the parasitic fungus <strong data-start=\"3234\" data-end=\"3260\">Ampelomyces quisqualis<\/strong> are also useful, but should not be applied together with <a href=\"https:\/\/www.coltivobio.com\/en\/correct-use-of-sulfur-fungicide-in-agriculture\/\">sulfur<\/a> or within five days after sulfur treatment.<\/p>\n<p data-start=\"3370\" data-end=\"3635\">Among natural remedies, <strong data-start=\"3394\" data-end=\"3415\">Bacillus subtilis<\/strong> can be used. Commercial formulations based on this naturally occurring antagonistic bacterium are now available and registered for treatments against rose powdery mildew. These products are approved for organic farming.<\/p>\n<p data-start=\"3637\" data-end=\"3789\">Another option is the use of <strong data-start=\"3666\" data-end=\"3696\">sweet orange essential oil<\/strong>, for which commercial formulations suitable for organic agriculture are currently available.<\/p>\n<p data-start=\"3791\" data-end=\"4000\">Finally, treatments based on <strong data-start=\"3820\" data-end=\"3858\">plant strengtheners (corroborants)<\/strong> may have a secondary effect against powdery mildew. In particular, soybean oil and zeolite have shown suppressive action against the disease.<\/p>\n<p data-start=\"4002\" data-end=\"4239\">It should also be remembered that rose varieties differ in their susceptibility to powdery mildew. Avoid planting roses in areas where severe outbreaks have occurred, or choose cultivars with declared tolerance to <em data-start=\"4216\" data-end=\"4238\">Sphaerotheca pannosa<\/em>.<\/p>\n<h2 data-start=\"4246\" data-end=\"4315\"><strong data-start=\"4249\" data-end=\"4315\">Fungicides and natural remedies to control rose powdery mildew<\/strong><\/h2>\n<ul>\n<li data-start=\"4319\" data-end=\"4343\">Sulfur-based fungicide<\/li>\n<li data-start=\"4346\" data-end=\"4360\"><a href=\"https:\/\/www.coltivobio.com\/en\/potassium-bicarbonate-fungicide\/\">Potassium bicarbonate<\/a><\/li>\n<li data-start=\"4363\" data-end=\"4372\">Zeolite<\/li>\n<li data-start=\"4375\" data-end=\"4401\">Concentrated soybean oil<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Rose powdery mildew (white mildew) is a disease caused by the fungus Sphaerotheca pannosa var. rosae. If not treated, this plant disease can cause serious aesthetic damage to rose plants. In the following technical guide we will see how to identify the symptoms and how to treat rose powdery mildew using natural remedies. At the<\/p>\n","protected":false},"author":12,"featured_media":7346,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-214","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fungal-diseases"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"Rose powdery mildew: learn how to identify symptoms, understand the disease cycle, and control white mildew on roses with effective natural remedies.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Matteo Tarquini\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/www.coltivobio.com\/en\/rose-powdery-mildew\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.2\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta 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