Pheromone dispenser for Pityophthorus juglandis
Pityophthorus juglandis, known as the walnut twig beetle, is a small bark beetle responsible for thousand cankers disease that affects walnut trees. Adults bore galleries under the bark, disrupting sap flow and weakening the tree.
Life cycle and pest emergence
- Main flight: late spring to early autumn (May to October)
- Females bore galleries and lay up to 50 eggs under the bark
- Larvae feed on the phloem for 3–5 weeks
- Multiple generations per year depending on temperature
Why use this dispenser?
- Disrupts male–female sexual communication
- Reduces egg-laying and gallery development
- No impact on beneficial insects and pollinators
- An integral part of an integrated pest management (IPM) program against thousand cankers disease
Technical specifications
- Effective duration: 90 days under outdoor conditions
- Ready-to-use format, no assembly required
- Gradual, even release of pheromones
- Single-unit packaging, easy to store and install
Installation and trapping
- Trap type: funnel trap or sticky panel trap
- Placement: hang or attach 1–1.5 m above the ground, on the walnut trunk
- Spacing: 1 dispenser every 5–10 m along the orchard
- Installation period: April–May, before adult flights begin
- Monitoring: inspect the trap weekly and record captures
Practical tips
- Replace the dispenser after 90 days or after heavy rains
- Combine with visual monitoring of galleries under the bark
- Pair with preventive cultural practices (thinning, removal of infected wood)
- Store unused dispensers away from heat and light
Filtrer
