Controlling Whiteflies on Cucumbers Organically

Whitefly Lifecycle & Damage

Whiteflies suck sap, excrete honeydew (sooty mold), and vector viruses. Yellow/bronze leaves and stunted fruit indicate heavy infestation. Ants farm whiteflies for honeydew—control ants too.

Organic Control Strategy

1. Strong water spray daily (morning) to dislodge adults/nymphs.
2. Insecticidal soap every 3–5 days (cover undersides thoroughly).
3. Neem oil weekly—disrupts growth/reproduction.
4. Yellow sticky traps at plant height—monitor adults.
5. Beneficials: Release Encarsia formosa (parasitic wasp) or Delphastus (lady beetle).
6. Botanical spray: Rotenone/pyrethrum combo (last resort—harmful to bees).

Prevention

• Reflective mulch (aluminum foil/silver plastic) repels whiteflies.
• Interplant with nasturtiums, marigolds, basil.
• Remove weeds (alternate hosts).
• Sanitize greenhouse/tools between crops.

When to Remove Plants

If infestation persists > 2 weeks despite treatment, remove and destroy plants to protect others.