Posted by - Dilute the Neem Oil: Mix 5-10 ml of neem oil with 1 litre of water. Add a few drops (about 1 ml) of mild liquid soap or dish detergent (like Castile soap) to help emulsify the oil and water, ensuring it spreads evenly. The soap also helps the solution stick to plant surfaces.
- Prepare the Solution: Combine the ingredients in a spray bottle and shake well to mix thoroughly. Always prepare a fresh batch, as the mixture can separate or lose potency over time.
- Test First: Before applying widely, spray a small area of the affected plant and wait 24 hours to ensure no adverse reactions (like leaf burn) occur, especially if the plant is delicate or stressed.
- Apply Properly: Spray the solution evenly on all affected areas—leaves, stems, and soil—covering both the tops and undersides of leaves where mildew spores often hide. Mildew (like powdery mildew) thrives in warm, dry conditions, so thorough coverage is key.
- Timing: Apply in the early morning or late afternoon to avoid direct sunlight, which can cause the oil to heat up and potentially harm the plant. Avoid applying during high humidity or rain, as it reduces effectiveness.
- Frequency: Repeat every 7-14 days until the mildew is gone. For prevention, apply once a month during the growing season. Be consistent but avoid overuse, as excessive oil can clog plant pores.
- Clean Up: Mildew spreads easily, so clean tools and nearby surfaces with a disinfectant or soap solution after treatment to prevent reinfection.
Notes: Neem oil works as both a fungicide and a repellent, disrupting mildew growth and spore reproduction. It’s most effective against powdery mildew but may be less potent for downy mildew or severe infestations. If the problem persists, consider combining it with other treatments like baking soda (5 ml per litre of water) or improving air circulation around the plants.
This method is safe for most plants, pets, and humans when used as directed, but always wash edible crops thoroughly before consuming.