How to spot and treat plant diseases for a thriving garden

Does your garden seem less vibrant than usual? Wilting leaves, discoloured spots, or powdery growths might indicate plant diseases. Early detection is key to saving your precious greenery. This blog equips you with the knowledge to identify, tackle and prevent common plant diseases with Efekto garden protection products, ensuring your garden flourishes throughout the season.

A hand holding leaves with yellowing and black spots.

Identifying and treating plant diseases

Many plant diseases thrive in damp conditions with poor air circulation. Understanding the signs and symptoms allows for prompt intervention and prevents further damage.

Here’s a look at some common plant diseases and how to address them:

Powdery mildew

Look for white powdery patches on leaves, young shoots, and flowers. To prevent this fungal disease, improve air circulation by pruning crowded plants, ensure proper spacing, and provide adequate sunlight. If powdery mildew strikes, apply Efekto Kumulus fungicide according to the usage instructions.

Close-up of a leaf surface with powdery mildew plant disease.

Black spot

Black spot causes dark-coloured spots with feathery edges on rose leaves, eventually leading to leaf drop. Prevent this issue by watering roses at the base to avoid wetting the leaves and consider using resistant rose varieties. If black spot appears, apply Efekto Rosecare fungicide as a preventative measure.

Leaf with black spots indicating plant disease.

Brown rot

Brown rot causes developing fruits like plums, peaches, and nectarines to rot and turn brown. Pick up fallen fruit promptly and dispose of them properly to avoid brown rot affecting next years crop. Prune and remove diseased branches to improve air circulation. While there’s no cure for infected fruits, consider using Efekto Virikop fungicide as a preventative measure on healthy fruits.

Diseased leaves with a peach suffering from brown rot.


Rust appears as orange or rust-coloured powdery spots on the undersides of leaves and sometimes on stems, often accompanied by stunted growth. It’s prevalent on plants like snapdragons, canna lilies, marigolds, and geraniums. Prevent rust by watering plants at the base to avoid wetting the leaves and provide good air circulation. There’s no effective treatment for existing rust, but removing infected plant parts and applying a fungicide like Efekto Virikop can help prevent further spread.

Close-up of leaves with orange spots indicative of rust plant disease.

General tips for plant disease prevention

  • Proper watering: Avoid overwatering, which creates a damp environment ideal for fungal diseases. Water deeply and infrequently, allowing the soil to dry slightly between waterings.
  • Air circulation: Ensure good air circulation around your plants by thinning overcrowded areas.
  • Sunlight: Provide adequate sunlight for your plants, as many diseases thrive in shady areas.
  • Healthy soil: Maintain healthy soil with proper drainage and organic matter to promote strong plant growth, making them more resistant to disease.
  • Sanitation: Remove and dispose of infected plant parts promptly to prevent further spread of disease.

Now that you’re armed with knowledge about plant diseases, along with treatment methods and plant care products, your plants have a great chance of returning to their former glory. Explore our range of garden protection products to address other diseases, tackle weeds, fight pests, and more, ensuring your garden remains a thriving, vibrant space.