Neem oil, an essential oil that has anti-fungal properties, can be quite effective in killing powdery mildew. It can help control many fungal problems in the garden, including powdery mildew, blight, rust, Scab, and black spots. Is Neem oil a fungicide? Neem oil is made from the seeds and fruit of the evergreen neem tree, and it is powerful enough to kill powdery mildew in less than 24 hours. Tea tree oil shares neem oil's anti-microbial properties, though it is not as effective, and has a pleasant scent. The fungus tends to affect plants that are crowded and receive poor air circulation, such as cucumber, squash, and melons. What is neem oil? A 2009 study by the University of Connecticut concluded that milk is just as effective than chemical applications (if not moreso) when it comes to treating powdery mildew. This year, as soon as I noticed the mildew returning, I used a neem oil and water mix spray, coating all the leaves about twice a week. You have a choice of low toxicity fungicides like horticultural oils. These include jojoba oil, neem oil, and brand name spray oils designed for fruit trees. Yes, Neem oil has excellent anti-fungal characteristics. This is an effective disease control and a broad spectrum, natural insecticide that is kinder to beneficial insects and mammals. Unfortunately, neem has a strong, bitter garlic-like scent that can be fairly unpleasant. Prevention is the best practice. Neem oil is labeled for control of powdery mildew, rust, blackspot, botrytis, downy mildew and other diseases. Spraying with 2.5 Tablespoons per gallon of water every 7 to 14 days is recommended. This may sound like a surprising solution, but milk is an extremely effective powdery mildew treatment. Neem oil comes from the tree Azadirachta indica, a South Asian and Indian plant common as an ornamental shade tree. Neem oil – This is a readily available organic option to disease and pest control. It kills common plant pests, such as mites, flies and aphids, and common diseases, such as powdery mildew and rust. Neem oil is a natural, non-toxic product that is a fungicide as well as an insecticide. Rose black spots, powdery mildew and rust, and other fungi endemic to still and humid conditions cannot take hold. To eradicate mild to moderate powdery mildew infections, use a horticultural oil such as Saf-T-Side Spray Oil, Sunspray Ultra-Fine Spray Oil, or one of the plant-based oils such as neem oil or jojoba oil … Neem oil can also be useful to prevent or control root rot while working as a mild growth stimulant. Classic fungicides that are used against apple scab, such as sterol inhibitors, are highly effective at controlling powdery mildew. It can safely be used on food, leaves no dangerous residue in the soil and effectively reduces or kills pests, as well as prevents powdery mildew on plants. Powdery mildew is a fungus that flourishes when the days are warm, the nights are cool, and dew forms on the foliage of the plants. One of the easiest ones to recognize is powdery mildew; it looks just like its name. These include myclobutanil and fenbuconazole. When applied as a preventative measure before the plant is infected, neem oil can protect the plant from the fungal diseases for the entire season. Alternate days that follow nights when you have not used the neem, spray down the plants in the morning so they can sun dry fully later in the afternoon. via Couleur/pixabay.com. Neem oil is extracted from the neem tree, native to India. Do this at night. Mint oil (Fungastop) and rosemary oil (Sporan) are now being marketed as fungicides. What is Neem Oil? Unlike chemical pesticides, neem oil does not kill beneficial insects, such as ladybugs. Neem oil acts as a prophylactic measure for pathogens and pests when it’s applied every ten days. 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