{"id":4628,"date":"2025-06-25T09:00:57","date_gmt":"2025-06-25T07:00:57","guid":{"rendered":"https:\/\/www.msbiotech.net\/?p=4628"},"modified":"2025-06-19T13:29:59","modified_gmt":"2025-06-19T11:29:59","slug":"powdery-mildew-and-downy-mildew-what-they-are-how-they-differ-and-how-we-can-help-you","status":"publish","type":"post","link":"https:\/\/www.msbiotech.net\/en\/oidio-e-peronospora-cosa-sono-differenze-e-come-possiamo-aiutarti\/","title":{"rendered":"Powdery mildew and downy mildew: what they are, differences and how we can help you"},"content":{"rendered":"

Powdery mildew and downy mildew are two of the most common and damaging fungal diseases in agriculture. They affect a wide variety of crops - from grapevines to vegetables, tomatoes, lettuce, courgettes and cereals - and can seriously affect crop yields and quality.<\/p>\n

Often confused with each other, these two pathologies have different causes, opposing development conditions and require targeted strategies<\/strong>. In this article, we explain how to recognise, prevent and counteract them, also thanks to the microbiological solutions from MS Biotech<\/strong>formulated for modern, sustainable and residue-free agriculture.<\/p>\n

Oidium: the 'white disease' that loves heat<\/strong><\/h2>\n

Powdery mildew is caused by fungi of the genus<\/a> Erysiphe<\/em>, Podosphaera<\/em> and the like<\/strong>. It is easily recognisable by the white powdery patina<\/strong> covering leaves, stems and fruits. It develops under conditions of dry heat<\/strong>especially when the plants are dense and poorly ventilated.<\/p>\n

The initial symptoms appear on the upper page of the leaves, then spread to the young shoots and finally to the fruit, causing necrosis, deformation and slowing down of photosynthesis<\/strong>. The most affected crops are vine, tomato, courgette, cucumber, rose and cereals.<\/p>\n

Downy mildew: the silent enemy of humidity<\/strong><\/h3>\n

Downy mildew is caused by oomycetes such as Plasmopara viticola<\/em> o Phytophthora infestans<\/em>. It manifests itself under opposite conditions to powdery mildew: high humidity, frequent rainfall and prolonged leaf wetness<\/strong>.<\/p>\n

The first signs are translucent, oily spots on the leaves<\/strong>which become necrotic over time. A whitish mould appears on the underside. The crops affected are mainly grapes, tomatoes, potatoes, lettuce and onions. If left unchecked, downy mildew can lead to complete destruction of vegetation<\/strong> in a few days.<\/p>\n

Differences to bear in mind<\/strong><\/h3>\n

Despite being both fungal diseases<\/strong>, powdery mildew and downy mildew develop under opposite conditions: powdery mildew proliferates in hot, dry environments, downy mildew in cool, moist environments. Also the way in which attacking the plant is different<\/strong>: powdery mildew grows on the surface of the leaves, downy mildew penetrates the tissues, making its action deeper and more systemic.<\/p>\n

Recognising the disease early and adopting a preventive approach is essential to limit its impact, avoiding repeated chemical interventions or irreversible damage to the crop.<\/p>\n

Defence strategies: acting before it is too late<\/strong><\/h2>\n

The fight against powdery mildew and downy mildew is not won with a single product, but with an approach integrated and targeted<\/strong>. This includes:<\/p>\n