Red gum lerp psyllid

Systematic position: The red gum lerp psyllid (Glycaspis brimblecombei) is a member of the Hemiptera order and the Aphalaridae family. Originally native to Australia, it has become a major invasive pest in many parts of the world where eucalyptus species are introduced.

Host plants: This insect primarily infests various species of the Eucalyptus genus. It poses a significant threat to forestry operations, private orchards, and ornamental trees, often leading to rapid population growth in favorable climatic conditions.

Biology and life cycle: The lifecycle consists of eggs, five nymphal instars, and adults. A unique feature of this species is the construction of protective covers known as "lerps" made from crystallized honeydew. Nymphs remain hidden beneath these structures throughout their development while feeding on the plant phloem.

Nature of damage: Feeding by large populations causes significant stress to the host tree. Symptoms include leaf yellowing, chlorosis, and premature leaf drop. Severe infestations lead to canopy thinning and, in extreme cases, can cause branch dieback or mortality in severely stressed individual trees.

Control measures: Management of the psyllid is largely centered on biological control programs. The release of the parasitoid wasp Psyllaephagus bliteus has shown success in reducing pest populations in several regions. Other strategies include:

• Monitoring of tree health and density.
• Systemic insecticide treatments for highly valuable ornamental trees.
• Maintaining tree vigor through proper irrigation and fertilization.
• Avoiding the transport of infested plant material.