Whiteflies reproduce explosively and transmit viruses. Effective control of all stages of development.
Whiteflies are extremely persistent pests that require systematic control:
**Identify whitefly:**
- 1-2mm small, white flying insects
- Hide on the undersides of leaves
- Flies up when touching the plant
- Lay eggs in a circle on leaves
- Yellow, sticky larval stages
**Damage pattern:**
- Yellowing, wilting leaves
- Sticky honeydew excretions
- Sooty mould fungi on honeydew
- Virus transmission possible
- Growth disorders
**Interrupt life cycle:**
- Egg stage: 7-10 days
- 4 larval stages: 2-4 weeks
- Pupa stage: a few days
- Adult: 2-5 weeks
- Treatment necessary every 3-4 days
**Biological control:**
- Encarsia formosa (ichneumon wasps)
- Eretmocerus species
- Macrolophus bugs
- Delphastus ladybirds
- Combine several beneficial insects
**Sticky trap strategy:**
- Yellow traps for monitoring
- White traps for maximum catch
- 1 trap per 2-3 plants
- Renew every 3-5 days
- Change position frequently
**Spray treatments:**
- Neem oil every 3 days
- Soapsuds daily
- Pyrethrin for severe infestation
- Reach all undersides of leaves
- Spray in the morning and evening
**Systemic control:**
- Imidacloprid watering solution
- Only in vegetative phase
- 2-3 applications
- Observe waiting time before harvest
- Combine with biological control
Whitefly requires persistent, combined control of all life stages over several weeks.
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