Downy mildew

How to treat?

• Biological

  • If possible remove and destroy the infected parts of the plant. Burn it, toss it into the garbage, or bury it deeply. Do not compost.

  • If the infection is widespread, remove and destroy the infected plant. Burn it, toss it into the garbage, or bury it deeply. Do not compost.

  • Apply ecological products for plant protection (e.g. baking soda, hydrogen peroxide, copper spray).

• Chemical

  • If necessary, apply fungicide containing propamocarb hydrochloride (GHS07: Harmful) (on onion, cucumber, and potatoes).

  • If necessary, apply fungicide containing metalaxyl (GHS07: Harmful) (on garden crops).

  • If necessary, apply fungicide containing fluopicolide (GHS09: Environmental hazard).

• Disease prevention

  • Water the soil surface, avoid watering leaves.

  • Improve the air circulation around the plant (e.g. by pruning excess foliage or increasing the spacing between plants).

  • Ensure having good soil drainage to avoid overwatering.

  • Use resistant species and cultivars as well as healthy, certified seeds and seedlings.

  • If necessary, use chemical products as a prevention (e.g. copper-based spray). These chemicals may lead to the development of resistant strains.