Diseases

Downy mildew

Identify Downy mildew: symptoms, possible causes, prevention, and practical actions for 52 affected plants. yellowish spots on upper leaf surfaces

Affected plantsDiseases

Downy mildew is relevant across 52 plant profiles on Wild-Wuchs. In the data it is most often linked with Barbarea vulgaris, Tree spinach, Watercress, butternut squash, Chayote. Typical signs include: yellowish spots on upper leaf surfaces For gardeners, early diagnosis, suitable growing conditions, and gentle action matter most: follow crop rotation

Plants

52

Category

Bulb and tuber vegetables, Fruit, Herbs, Leafy vegetables, Legumes

Risk

medium, low, high

Synonyms

Bremia-lactucae, Downy Mildew (Peronospora farinosa f.sp. betae), Downy Mildew (Peronospora parasitica), Downy mildew (Peronospora parasitica), Falscher Mehltau, Falscher mehltau, Falscher-mehldau, Falscher-mehltau

Scientific name

Pseudoperonospora cubensis, Peronospora destructor, Peronospora manshurica

Overview

Symptoms

  • yellowish spots on upper leaf surfaces
  • Grey to purplish growth on leaf undersides
  • Premature leaf drop

Damage

  • Fungal disease causing yellowish spots on upper leaf surfaces and violet fungal growth on undersides.
  • Downy mildew is a fungal disease that occurs in cool, humid weather. It can affect entire crops and significantly reduce yield.

Causes

Pilz Peronospora parasitica, feuchte Witterung.

Prevention

  • follow crop rotation
  • Good air circulation
  • Adequate plant spacing

Organic control

  • remove infected leaves
  • Fungizide auf Kupferbasis (sparsam einsetzen)
  • Sprays with plant extracts (e.g., horsetail)

Season

  • peak infection May–September
  • Cool, wet weather in spring and autumn

Affected plants

Barbarea vulgarisTree spinachWatercressbutternut squashChayoteCommon chicoryNapa cabbageChoy Sumcommon sageAcorn Squashiceberg lettuceCichorium endiviaLeafy Goosefootcorn saladRadishGarden OracheCucumberGood King Henrybuck's-horn plantainred kuri squashGarlicKomatsunaButterhead lettuceAlliumWelsh onionMay turnipmarjoramSwiss ChardBok choypattypan squashRadicchioRomaine lettuceBrussels sproutsbeetred cabbageArugulaSorrelShallotAllium ramosumcutting lettuceScorzonerasoybeanSpinachpointed cabbageStielmustable grapeTatsoiwatermelonWhite CabbageWinter Heath OnionZucchiniMuskmelon

Guides

Related guides

Garden guides

Similar topics

ClubrootPowdery mildewRoot rotGray moldBacterial wiltRust fungiWhite blisterWhite rotCercospora leaf spotLeaf spot disease

FAQ

How do I recognize Downy mildew?

yellowish spots on upper leaf surfaces

What causes Downy mildew?

Pilz Peronospora parasitica, feuchte Witterung.

How can I prevent Downy mildew?

follow crop rotation

What helps against Downy mildew?

remove infected leaves

Which plants are affected?

Barbarea vulgaris, Tree spinach, Watercress, butternut squash, Chayote, Common chicory, Napa cabbage, Choy Sum, common sage, Acorn Squash, iceberg lettuce, Cichorium endivia

When does Downy mildew usually appear?

peak infection May–September