Cacopsylla ulmi

Cacopsylla_ulmi_01

Cacopsylla ulmi

Cacopsylla ulmi is a species of insect in the family Psyllidae. Commonly known as the elm leaf-curling aphid, it is a pest that primarily infests elm trees (genus Ulmus). The species is native to Europe and has spread to other parts of the world where elm trees are present.

Description

Cacopsylla ulmi is a small insect, measuring around 2-3 millimeters in length. It has a distinctive yellow-green coloration and is known for its habit of curling elm leaves to create protective shelters for feeding and reproduction.

Life Cycle

The life cycle of Cacopsylla ulmi typically involves multiple generations per year. The insect overwinters as eggs on elm trees and hatches in the spring. The nymphs feed on elm leaves, causing damage to the tree. As they mature, they reproduce and lay eggs for the next generation.

Damage

Infestations of Cacopsylla ulmi can cause significant damage to elm trees. The feeding activity of the nymphs can lead to leaf curling, distortion, and discoloration. Severe infestations may weaken the tree and affect its overall health.

Management

Management of Cacopsylla ulmi infestations often involves a combination of cultural, biological, and chemical control methods. Pruning affected branches, promoting tree health, and introducing natural predators can help reduce populations of the insect. In cases of severe infestation, insecticidal treatments may be necessary.