1. How it Works
Neem oil is a very effective natural fungicide and insecticide extracted from the seed kernels of the neem tree (Azadirachta indica), native to India. The extraction process involves soaking the kernels in water and alcohol to separate the pesticidal constituents. The end product is Clarified Hydrophobic Extract of Neem Oil, which boasts anti-fungal properties used for fungicide applications.
Neem oil works as a contact pesticide by blocking the breathing pores of insects and mites, effectively suffocating them. It’s especially effective against soft-bodied insects like aphids, whiteflies, spider mites, mealybugs, and scale. Plus, the smell of neem acts as a repellent for over 170 different insect species.
2. Usage
Neem oil is better used as a preventative measure. It’s great for applying in late winter when insect eggs are young, kick-starting your plant’s growing season. To enhance its effectiveness, you can mix neem oil with a surfactant or spreader sticker. This helps the oil stay on the plant longer, though be aware that surfactants can burn plants if used improperly. It’s also advisable to apply the product in the late evening, as many pollinators are active during the day.
3. Targeting Specific Pests and Diseases
Neem oil prevents and controls a range of plant diseases, including powdery mildew, black spot, anthracnose, rust, and blight. It’s also effective against numerous insects, including aphids, spider mites, scale, whiteflies, beetles, and more. It’s particularly good at controlling insects when they’re immature, but it can also affect some adult pests. Neem oil is an excellent choice for a dormant season application to kill over-wintering larvae, nymphs, and eggs.
