{"id":546,"date":"2026-10-02T22:46:01","date_gmt":"2026-10-02T21:46:01","guid":{"rendered":"https:\/\/www.coltivobio.com\/en\/?p=546"},"modified":"2026-10-03T10:39:51","modified_gmt":"2026-10-03T09:39:51","slug":"potassium-bicarbonate-fungicide","status":"publish","type":"post","link":"https:\/\/www.coltivobio.com\/en\/potassium-bicarbonate-fungicide\/","title":{"rendered":"Potassium bicarbonate fungicide for plant diseases"},"content":{"rendered":"<p data-start=\"205\" data-end=\"577\"><strong>Potassium bicarbonate is one of the most widely used products in agriculture, especially in organic and integrated crop protection, for the control of several fungal diseases. It is a mineral-derived substance valued for its effectiveness, rapid action, and low environmental impact, making it suitable for both professional growers and home gardeners. <\/strong>This article contains affiliate links. We may earn a commission from qualifying purchases.<\/p>\n<h2><strong>What is potassium bicarbonate?<\/strong><\/h2>\n<figure id=\"attachment_6950\" aria-describedby=\"caption-attachment-6950\" style=\"width: 579px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-6950 size-medium\" src=\"https:\/\/www.coltivobio.com\/wp-content\/uploads\/2025\/12\/bicarbonato-di-potassio-fungicida-579x462.jpg\" alt=\"what potassium bicarbonate looks like\" width=\"579\" height=\"462\" srcset=\"https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2025\/12\/bicarbonato-di-potassio-fungicida-579x462.jpg 579w, https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2025\/12\/bicarbonato-di-potassio-fungicida-564x450.jpg 564w, https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2025\/12\/bicarbonato-di-potassio-fungicida-768x612.jpg 768w, https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2025\/12\/bicarbonato-di-potassio-fungicida-1536x1225.jpg 1536w, https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2025\/12\/bicarbonato-di-potassio-fungicida-2048x1633.jpg 2048w\" sizes=\"auto, (max-width: 579px) 100vw, 579px\" \/><figcaption id=\"caption-attachment-6950\" class=\"wp-caption-text\">Appearance of potassium bicarbonate<\/figcaption><\/figure>\n<p data-start=\"827\" data-end=\"1057\">Potassium bicarbonate is a water-soluble alkaline salt. In agriculture, it is mainly used as a <strong data-start=\"944\" data-end=\"969\">contact fungicide<\/strong>, meaning that it acts directly on fungal structures present on the surface of the plant.<\/p>\n<p data-start=\"1059\" data-end=\"1243\">Unlike systemic products, it does not enter plant tissues. Instead, it works through a <strong data-start=\"1156\" data-end=\"1182\">physical and chemical mode of action<\/strong>, creating unfavorable conditions for pathogen development.<\/p>\n<h2 data-start=\"1250\" data-end=\"1299\"><strong>How it works against fungal diseases<\/strong><\/h2>\n<p data-start=\"1301\" data-end=\"1640\">Potassium bicarbonate works through several complementary mechanisms. First, it alters the <strong data-start=\"1399\" data-end=\"1431\">pH of the leaf surface<\/strong>, creating conditions that are unfavorable for fungal spore germination. It also causes direct <strong data-start=\"1539\" data-end=\"1604\">dehydration and collapse of fungal cell structures<\/strong>, rapidly leading to their death.<\/p>\n<p data-start=\"1642\" data-end=\"1766\">For this reason, it is effective mainly against pathogens that develop on the surface of leaves and fruit.<\/p>\n<p data-start=\"1809\" data-end=\"1903\">Potassium bicarbonate <strong>is successfully used<\/strong> against <strong>powdery mildews<\/strong> and is partially effective against several other fungal diseases, including:<\/p>\n<ul>\n<li data-start=\"1907\" data-end=\"1957\"><a href=\"https:\/\/www.coltivobio.com\/en\/grapevine-powdery-mildew-erysiphe-necator\/\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"1907\" data-end=\"1916\">Powdery mildew<\/strong> on grapevines<\/a>, vegetable crops, and ornamental plants (good activity)<\/li>\n<li data-start=\"1960\" data-end=\"1994\"><strong data-start=\"1960\" data-end=\"1977\">Apple and pear scab<\/strong> (moderate activity)<\/li>\n<li data-start=\"1997\" data-end=\"2024\"><strong data-start=\"1997\" data-end=\"2011\">Alternaria<\/strong> on vegetable crops (moderate activity)<\/li>\n<li data-start=\"2027\" data-end=\"2070\"><strong data-start=\"2027\" data-end=\"2049\">Surface molds<\/strong> on various crops (good activity)<\/li>\n<li data-start=\"2027\" data-end=\"2070\"><a href=\"https:\/\/www.coltivobio.com\/en\/grapevine-gray-mold\/\" target=\"_blank\" rel=\"noopener\"><strong>Gray mold<\/strong><\/a> caused by Botrytis (good activity)<\/li>\n<\/ul>\n<p data-start=\"2072\" data-end=\"2217\">Its activity is mainly <strong>preventive and contact-based<\/strong>, which means it provides the best results when used <strong>preventively<\/strong> and is generally only slightly effective or ineffective once infections are already advanced.<\/p>\n<div class=\"vlp-link-container vlp-template-default \">\n\t<a href=\"https:\/\/www.coltivobio.com\/en\/natural-pyrethrum-an-insecticide-used-in-agriculture\/\" class=\"vlp-link\" title=\"Read also: natural pyrethrum: an insecticide used in agriculture.\"><\/a>\t\t<div class=\"vlp-link-image-container\">\n\t\t<div class=\"vlp-link-image\">\n\t\t\t<img loading=\"lazy\" decoding=\"async\" style=\"max-width: 150px;\" width=\"150\" height=\"97\" src=\"https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2017\/08\/piretro.jpg\" class=\"attachment-150x999 size-150x999\" alt=\"\" \/>\t\t<\/div>\n\t<\/div>\n\t\t<div class=\"vlp-link-text-container\">\n\t\t\t\t<div class=\"vlp-link-title\">\n\t\t\tRead also: natural <a href=\"https:\/\/www.coltivobio.com\/en\/natural-pyrethrum-an-insecticide-used-in-agriculture\/\">pyrethrum<\/a>: an insecticide used in agriculture.\t\t<\/div>\n\t\t\t\t\t<\/div>\n<\/div>\n\n<h2 data-start=\"2224\" data-end=\"2262\"><strong>How to use potassium bicarbonate in agriculture<\/strong><\/h2>\n<p data-start=\"2264\" data-end=\"2498\">Potassium bicarbonate should be applied as a foliar treatment, ensuring <strong data-start=\"2350\" data-end=\"2390\">uniform coverage of the vegetation<\/strong>. Because it is a contact product, application quality is essential for achieving good results.<\/p>\n<p data-start=\"2500\" data-end=\"2521\">It can be used:<\/p>\n<ul>\n<li data-start=\"2524\" data-end=\"2578\"><strong data-start=\"2527\" data-end=\"2542\">preventively<\/strong>, before symptoms appear<\/li>\n<li data-start=\"2581\" data-end=\"2645\">at the <strong data-start=\"2584\" data-end=\"2614\">first signs of disease<\/strong>, to help stop its spread<\/li>\n<\/ul>\n<p data-start=\"2647\" data-end=\"2831\">It is often used <strong data-start=\"2670\" data-end=\"2725\">in rotation with other crop protection products<\/strong> to reduce the risk of resistance and improve the overall effectiveness of the disease management program.<\/p>\n<p data-start=\"2647\" data-end=\"2831\">In agriculture, there are <strong data-start=\"146\" data-end=\"178\">two types of potassium bicarbonate<\/strong> commercially available: potassium bicarbonate <strong data-start=\"220\" data-end=\"262\">registered as a plant protection product<\/strong> and potassium bicarbonate <strong data-start=\"272\" data-end=\"308\">registered as a basic substance<\/strong>.<br data-start=\"309\" data-end=\"312\" \/>Under current regulations, potassium bicarbonate marketed as a <strong data-start=\"381\" data-end=\"401\">basic substance<\/strong> must be <strong data-start=\"417\" data-end=\"437\">food grade<\/strong>, meaning that it consists of <strong data-start=\"455\" data-end=\"485\">100% active substance<\/strong>, and it can be used freely on crops.<br data-start=\"542\" data-end=\"545\" \/>Potassium bicarbonate registered as a <strong data-start=\"578\" data-end=\"593\">plant protection product<\/strong>, despite containing the same active ingredient, is generally <strong data-start=\"660\" data-end=\"676\">more effective<\/strong> because it is formulated with <strong data-start=\"699\" data-end=\"725\">specific co-formulants<\/strong> that improve distribution, adhesion, and <strong data-start=\"779\" data-end=\"819\">persistence on plant surfaces<\/strong>, resulting in <strong data-start=\"841\" data-end=\"891\">greater overall treatment effectiveness<\/strong> (see products at the bottom of the article).<\/p>\n<p data-pm-slice=\"1 1 []\">Application rates for potassium bicarbonate are <strong>those indicated on the product label<\/strong>, and generally range from 0.4 to 0.67 oz per gallon 2.7\u20134.5 lb\/acre (3 to 5 grams per liter, 3\u20135 kg\/ha).<\/p>\n<figure id=\"attachment_6951\" aria-describedby=\"caption-attachment-6951\" style=\"width: 347px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-6951 size-medium\" src=\"https:\/\/www.coltivobio.com\/wp-content\/uploads\/2025\/12\/bicarbonato-potassio-agricoltura-347x462.jpg\" alt=\"bag of food-grade potassium bicarbonate for agricultural use\" width=\"347\" height=\"462\" srcset=\"https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2025\/12\/bicarbonato-potassio-agricoltura-347x462.jpg 347w, https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2025\/12\/bicarbonato-potassio-agricoltura-338x450.jpg 338w, https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2025\/12\/bicarbonato-potassio-agricoltura-768x1024.jpg 768w, https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2025\/12\/bicarbonato-potassio-agricoltura-1152x1536.jpg 1152w, https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2025\/12\/bicarbonato-potassio-agricoltura-1536x2048.jpg 1536w, https:\/\/www.coltivobio.com\/en\/wp-content\/uploads\/2025\/12\/bicarbonato-potassio-agricoltura-scaled.jpg 1920w\" sizes=\"auto, (max-width: 347px) 100vw, 347px\" \/><figcaption id=\"caption-attachment-6951\" class=\"wp-caption-text\">Bag of food-grade potassium bicarbonate for agricultural use<\/figcaption><\/figure>\n<h2 data-start=\"2838\" data-end=\"2877\"><strong>Advantages of potassium bicarbonate<\/strong><\/h2>\n<p data-start=\"2879\" data-end=\"2948\">The main advantages of potassium bicarbonate include:<\/p>\n<ul>\n<li data-start=\"2951\" data-end=\"2980\">rapid action against the pathogen<\/li>\n<li data-start=\"2983\" data-end=\"3014\">no hazardous residues<\/li>\n<li data-start=\"3017\" data-end=\"3043\">low environmental impact<\/li>\n<li data-start=\"3046\" data-end=\"3119\">compatibility with organic farming when registered formulations are used<\/li>\n<li data-start=\"3122\" data-end=\"3172\">no risk of fungal resistance<\/li>\n<li data-start=\"3122\" data-end=\"3172\">low cost<\/li>\n<\/ul>\n<p>One of the most important uses of <strong data-start=\"123\" data-end=\"150\">potassium bicarbonate<\/strong> is on <strong data-start=\"159\" data-end=\"170\">strawberries<\/strong>. Because strawberries are harvested repeatedly throughout the season, growers need products with a <strong data-start=\"238\" data-end=\"266\">short pre-harvest interval<\/strong> that <strong data-start=\"273\" data-end=\"298\">do not leave visible marks on the fruit<\/strong>. In this situation, potassium bicarbonate is often <strong data-start=\"349\" data-end=\"373\">preferred over <a href=\"https:\/\/www.coltivobio.com\/en\/correct-use-of-sulfur-fungicide-in-agriculture\/\" target=\"_blank\" rel=\"noopener\">sulfur<\/a><\/strong>, which can leave <strong data-start=\"387\" data-end=\"419\">visible residues on the fruit<\/strong>.<\/p>\n<h2><strong>Disadvantages of potassium bicarbonate<\/strong><\/h2>\n<p data-start=\"177\" data-end=\"597\">Because of its <strong data-start=\"237\" data-end=\"250\">alkaline pH<\/strong>, the use of <strong data-start=\"192\" data-end=\"219\">potassium bicarbonate<\/strong> has some practical limitations. Its effect on the leaf surface is <strong data-start=\"339\" data-end=\"358\">relatively short-lived<\/strong>, because within a few days the plant tends to restore the normal physiological pH of its leaf surfaces. As a result, <strong data-start=\"491\" data-end=\"528\">more frequent applications may be required<\/strong>, leading to <strong data-start=\"549\" data-end=\"596\">higher crop protection management costs<\/strong>.<\/p>\n<p data-start=\"599\" data-end=\"902\">Another limitation is that <strong data-start=\"633\" data-end=\"655\">tank mixing<\/strong> potassium bicarbonate with other products is generally not recommended because of its alkaline reaction. Most fungicides and insecticides require a slightly acidic solution, such as <strong><a href=\"https:\/\/www.coltivobio.com\/en\/natural-pyrethrum-an-insecticide-used-in-agriculture\/\" target=\"_blank\" rel=\"noopener\">natural pyrethrum<\/a><\/strong>. This limits the possibility of optimizing treatments by combining multiple active ingredients in the same spray tank and may require growers to make separate, more expensive applications.<\/p>\n<p data-start=\"904\" data-end=\"1488\">For these reasons, <strong data-start=\"106\" data-end=\"171\">potassium bicarbonate competes with <a href=\"https:\/\/www.coltivobio.com\/en\/correct-use-of-sulfur-fungicide-in-agriculture\/\">sulfur<\/a><\/strong>, which is more widely used in agriculture against powdery mildew because of its <strong data-start=\"227\" data-end=\"260\">longer residual activity<\/strong>, the <strong data-start=\"267\" data-end=\"319\">possibility of tank mixing it with other active ingredients<\/strong>, and its <strong data-start=\"325\" data-end=\"392\">useful secondary activity against plant-feeding mites <a href=\"https:\/\/www.coltivobio.com\/en\/two-spotted-spider-mite\/\" target=\"_blank\" rel=\"noopener\">(such as two-spotted spider mites)<\/a><\/strong>.<\/p>\n<p>As an alternative to potassium bicarbonate, <strong>sodium bicarbonate<\/strong> can also be used.<\/p>\n<p>However, sodium bicarbonate is less commonly used in agriculture because it can cause phytotoxicity when applied at incorrect rates and adds sodium, an element that can be unfavorable to both soil and plants over the long term.<\/p>\n<h2><strong>Products available online:<\/strong><\/h2>\n<ul>\n<li><strong>MilStop SP (Organic Foliar Fungicide)<\/strong>:<strong> <a href=\"https:\/\/amzn.to\/3VN0hvH\" target=\"_blank\" rel=\"nofollow noopener\">https:\/\/amzn.to\/3VN0hvH<\/a><\/strong><\/li>\n<li><strong>Pure Potassium Bicarbonate (food grade): <a href=\"https:\/\/amzn.to\/4yoxBYl\" target=\"_blank\" rel=\"nofollow noopener\">https:\/\/amzn.to\/4yoxBYl<\/a><\/strong><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Potassium bicarbonate is one of the most widely used products in agriculture, especially in organic and integrated crop protection, for the control of several fungal diseases. It is a mineral-derived substance valued for its effectiveness, rapid action, and low environmental impact, making it suitable for both professional growers and home gardeners. This article contains affiliate<\/p>\n","protected":false},"author":12,"featured_media":8181,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-546","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-means-of-defense"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"Learn how potassium bicarbonate works as a contact fungicide against powdery mildew and other fungal diseases, plus rates, benefits, and limits.\" \/>\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\/potassium-bicarbonate-fungicide\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.2\" \/>\n\t\t<meta property=\"og:locale\" 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