Acacia psyllid

The Acacia psyllid (scientific name: Acizzia acaciaebaileyana) is a small sap-sucking insect belonging to the order Hemiptera and the family Psyllidae. This pest is specifically known for its impact on ornamental acacia species, particularly in urban and garden landscapes.

The primary host for this pest is the Bailey acacia (Acacia baileyana). The insects target the young, tender foliage and stems of the tree, utilizing their piercing-sucking mouthparts to extract vital nutrients, which weakens the plant over time.

The biological cycle involves three main stages: egg, nymph, and adult. The females typically lay eggs on fresh growth, ensuring that the emerging nymphs have immediate access to a food supply. Their rapid reproductive cycle allows populations to build up quickly under favorable environmental conditions.

Damage symptoms include curling, twisting, and yellowing of the leaves, as well as a noticeable reduction in new shoot elongation. Nymphs secrete honeydew, a sticky substance that promotes the growth of sooty mold, which further affects the photosynthetic capacity and aesthetic value of the plant.

• Regular monitoring of acacia trees, especially during the spring growth flush.
• Application of horticultural oils or insecticidal soaps for early infestations.
• Using systemic insecticides for severe outbreaks to protect new growth.
• Pruning and removing heavily infested branches to reduce the pest reservoir.
• Conserving natural enemies like ladybirds and lacewings that feed on psyllid nymphs.