Diploschema rotundicolle

Diploschema rotundicolle is a destructive species of longhorned beetle (Cerambycidae) within the order Coleoptera. This wood-boring pest is known for causing significant economic damage to woody perennials by infesting stems and branches during its larval stage.

The primary hosts for this insect are citrus species, including lemons, oranges, and grapefruits. However, it also demonstrates a preference for a range of other fruit trees such as figs and peaches, making it a serious concern for commercial orchardists and private growers alike.

The life cycle is primarily internal, complicating detection. Adult females deposit eggs into cracks in the bark. Upon hatching, the larvae tunnel into the cambium and xylem layers. They spend a considerable portion of their life cycle feeding inside the tree, creating complex galleries that disrupt nutrient and water transport.

Damage caused by Diploschema rotundicolle is often progressive. Initial symptoms include wilting foliage and localized dieback. As the larval infestation spreads, the tree loses vigor, becomes susceptible to secondary infections, and may eventually collapse. Signs of activity include frass, which is wood dust pushed out of entry holes in the bark.

Integrated pest management strategies are crucial for mitigation. Key actions include:

• Conducting frequent orchard inspections for exit holes and wood shavings.
• Pruning and destroying infested branches or removing dead trees immediately.
• Applying systemic or contact insecticides into the galleries where appropriate.
• Promoting overall tree vigor through balanced irrigation and fertilization to aid recovery.