Pear Trellis Rust
Gymnosporangium spp.
23 host plants
Last updated
Pear trellis rust affects pear and related hosts, with juniper serving as an alternate host in the ecosystem. Carefully examine plants before adding them to your landscape to prevent introducing disease. Remove infected branches to limit spread. Monitor for symptoms during spring when weather favors infection. Improve air circulation through selective pruning. This rust disease spreads readily in moist spring and fall conditions. Watch foliage closely for early symptoms.
Rust fungi often need two different host plants to complete their life cycle, so identifying and managing the alternate host can break the cycle. Remove heavily infected leaves and dispose of them away from the garden. Improve air circulation to speed leaf drying after rain. Fungicide applications are most effective as preventive treatments before symptoms appear; once pustules are visible, the current infection cycle is already underway.
Quick Reference
Management
These may appear as early as mid-June but are more commonly found in late summer. | Bright yellow to orange spots up to about 1" in diameter appear on pear leaves, twigs and branches i | Bright yellow to orange spots up to about 1" in diameter appear on pear leaves, fruit, twigs and bra
Cultural Controls
- Carefully examine plants before adding them to your landscape.
- Many diseases are introduced on infected planting material.
- Complete removal of one host is the only completely effective cultural control.
- Do not plant pears and junipers within 1,000 feet of each other.
- Most local transmission of this disease is by wind-blown spores.
- Plant only disease-resistant junipers in areas where this disease is a concern; cultivars of Juniperus squamata, J.