Eucalyptus psyllid

The Eucalyptus psyllid (Ctenarytaina bipartita) is a sap-sucking insect belonging to the order Hemiptera and the family Psyllidae. Originally native to Australia, it has become a significant invasive pest in many parts of the world where eucalyptus species are cultivated for forestry, ornamental, or essential oil production.

This pest primarily attacks the young leaves and shoots of various Eucalyptus species. By using its piercing-sucking mouthparts, the psyllid extracts vital nutrients from the host plant, which significantly impairs the growth and structural development of young trees and seedlings.

The life cycle of Ctenarytaina bipartita consists of eggs, several nymphal stages, and adults. Eggs are typically laid on the tender tips of developing shoots. The nymphs are sedentary feeders, and their rapid life cycle under favourable temperature conditions allows for multiple generations per year, making outbreaks difficult to contain.

Visible damage includes leaf curling, stunted shoot growth, and severe discoloration. The insects also secrete honeydew, which promotes the growth of sooty mold. This fungus blocks photosynthesis, further stressing the plant and reducing the quality and yield of eucalyptus crops in commercial plantations.

Management and control measures are essential for healthy plantations. These strategies include:

• Regular monitoring and scouting for early signs of infestation.
• Application of systemic insecticides that target sucking insects.
• Utilization of biological control agents, such as parasitoid wasps, which prey on psyllid nymphs to suppress populations.
• Implementation of proper silvicultural practices to ensure optimal tree vigor, making them more resilient.