Ceratina

Ceratina, commonly known as small carpenter bees, belongs to the family Apidae. While these insects are often recognized for their pollination services, their nesting behavior can cause significant mechanical damage to various plants. Unlike colonial bees, they are solitary and seek out specific environments to raise their brood.

These insects primarily affect plants that possess pithy or hollow stems. Common hosts include raspberry, blackberry, roses, and various herbaceous perennials. They select stems that are easy to excavate, making agricultural and ornamental plants particularly susceptible to their nesting activities.

The biology and lifecycle of Ceratina involve the excavation of tunnels within plant stems. The female constructs a series of brood cells in a linear arrangement, partitioned by wood shavings and saliva. Each cell contains a larva and a pollen provision. The larvae complete their development within these protective tunnels before emerging as adults.

The primary form of damage is the structural weakening of stems. By creating extensive tunnels, the bees compromise the integrity of the plant, often leading to stunted growth, reduced yields, or broken branches. Furthermore, these entry holes can act as entry points for water and fungal pathogens, potentially causing rot.

Effective protection strategies focus on cultural control methods. Key management practices include:

• Pruning and destroying infested stems during the dormant season.
• Sealing large pruning cuts with horticultural wax or latex paint to prevent entry.
• Maintaining plant vigor through proper fertilization and watering to minimize susceptibility.