Box Tree Caterpillar Life Cycle Explained (UK Guide)
The box tree caterpillar is the larval stage of the box tree moth (Cydalima perspectalis). Understanding the box tree caterpillar life cycle is essential for timing treatment correctly — because most solutions work best when caterpillars are actively feeding.
If you’re looking for a complete treatment plan, start here: Box Tree Caterpillar Treatment UK – Complete Guide.
Stage 1: Eggs
Adult moths lay clusters of pale yellow eggs on the underside of box leaves. Depending on temperature, eggs can hatch within 3–10 days.
Stage 2: Larvae (Caterpillars)
This is the most destructive stage. Green caterpillars with black stripes feed on leaves and can also damage bark in heavier infestations. This stage commonly lasts 3–4 weeks.
To understand seasonal timing, read: When Do Box Moths Appear in the UK?
Stage 3: Pupae
Caterpillars form cocoons within webbing inside the hedge. This stage generally lasts 1–2 weeks.
Stage 4: Adult Moths
Adult moths are typically white with brown-edged wings. They live around 10–14 days, during which they mate and lay eggs — restarting the cycle.
How Many Generations Per Year in the UK?
In the UK, there are typically two generations per year, with occasional third-generation risk in warm seasons. This is why infestations can escalate quickly if early signs are missed.
Why Life Cycle Knowledge Improves Treatment Success
Most treatments work best during the larval feeding stage. Monitoring moth activity helps you anticipate when eggs hatch and caterpillars begin feeding — improving results and reducing repeat outbreaks.
If you’re choosing what to use, see: Best Treatment for Box Hedge Caterpillars.
Recommended Next Steps
- Read the full treatment guide: Box Tree Caterpillar Treatment UK
- Explore products and monitoring options: Box Tree Care & Treatments
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