An organic pesticide extracted from neem tree seeds that disrupts insect feeding, reproduction, and growth, effective against soft-bodied insects and some fungal diseases.
In plain terms
Neem oil is a plant-based pesticide that interferes with insect hormones and reproduction. It kills soft-bodied insects (aphids, mites, scale) by contact and ingestion. It also has fungicidal properties, suppressing some fungal diseases. It's organic, biodegrades quickly, and doesn't harm beneficial insects unless they're directly sprayed. It's effective but requires repeat applications every 7-10 days.
Why this matters
Neem oil is one of the best organic pest controls. It's effective, relatively safe, and breaks down quickly without persisting in soil.
In practice
Examples
Aphid infestation sprayed with neem oil; aphids die within 24 hours; repeat weekly if new aphids appear.
Spider mite infestation treated with neem; requires weekly sprays as eggs hatch; effective but labor-intensive.
Powdery mildew on plants; neem spray suppresses it; prevents severe infections if applied early.
Scale insect control with neem; requires consistent applications to break lifecycle.
Practical applications
Spray in early morning or evening when beneficials are less active.
Spray until foliage drips; thorough coverage necessary.
Repeat every 7-10 days; follow label rates carefully.
Don't spray when temperatures exceed 85°F (can damage foliage).
Combine with other IPM strategies; don't rely on neem alone.