{"id":254,"date":"2026-06-16T20:54:13","date_gmt":"2026-06-16T19:54:13","guid":{"rendered":"https:\/\/www.coltivobio.com\/en\/?p=254"},"modified":"2026-07-14T22:07:41","modified_gmt":"2026-07-14T21:07:41","slug":"grapevine-diseases-and-pests-identification","status":"publish","type":"post","link":"https:\/\/www.coltivobio.com\/en\/grapevine-diseases-and-pests-identification\/","title":{"rendered":"Grapevine diseases and pests: identification guide with images"},"content":{"rendered":"

Like all plants, grapevines are subject to attacks by pests and diseases caused by viruses, bacteria, and fungi. In this practical guide, we will provide an overview of the main plant diseases that damage grapevines. For each disease or insect, you will find a link leading to a more complete description, since it is not possible to cover every topic in full detail in this technical sheet. We therefore invite you to explore the subject that interests you by clicking on the relevant links.<\/strong><\/p>\n

To facilitate and speed up identification, each disease or damage agent is described with photos and images. This technical guide is divided into three sections: disease agents (viruses, phytoplasmas, and fungi), damage agents (insects and mites), and physiological disorders of grapevine.<\/strong><\/p>\n

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Disease agents: fungal diseases and phytoplasmas<\/h1>\n

Grapevines are affected by a wide range of fungi and oomycetes that can cause significant damage. Below we analyze the most important ones and the remedies that can be applied to prevent and control them.<\/p>\n

Downy mildew of grapevine<\/strong><\/h2>\n

The pathogen attacks leaves, shoots, flowers, and fruit. The symptoms of grapevine downy mildew are quite characteristic. On the upper surface of leaves, yellowish and translucent round spots can be observed. These are commonly referred to as \u201coil spots\u201d<\/strong>.<\/p>\n

\"Oil
Figure 1 \u2013 Oil spot symptoms on grapevine leaves.<\/figcaption><\/figure>\n

On the underside of the leaves, corresponding to the oil spots, a white mold appears, composed of the pathogen\u2019s asexual reproductive structures. Eventually, the spots become necrotic. In rare cases, the white mold may appear without oil spots or vice versa.<\/p>\n

Affected inflorescences become covered with white mold, which can evolve into necrosis of the entire inflorescence. In other cases, only the tip becomes deformed, bending into a hook shape and turning brown before being covered by white mold.<\/p>\n

After fruit set, the pathogen begins to attack young grape clusters. In this case, it is referred to as \u201cLatent downy mildew infection\u201d<\/strong>, which appears as browning, dehydration, and partial or complete drying of the cluster.<\/p>\n

\"Downy
Figure 2 \u2013 Downy mildew symptoms on grape clusters.<\/figcaption><\/figure>\n

Control of grapevine downy mildew includes both agronomic practices and plant protection treatments. The most useful agronomic practices include:<\/p>\n