Willow leafhopper

Macropsis fumipennis is a species of leafhopper belonging to the order Hemiptera and the family Cicadellidae. This specific pest is primarily associated with willow species, where it acts as a sap-sucking insect, potentially causing significant physiological stress to its host plants in forest environments and nurseries.

The primary hosts for this species are various members of the genus Salix. Adults and nymphs congregate on the undersides of leaves and along tender young shoots to feed on phloem sap. High densities of this pest can result in the stunted growth of host trees, as the constant withdrawal of nutrients depletes the plant's resources.

The life cycle of Macropsis fumipennis involves overwintering as eggs, which are typically inserted into the bark of twigs. Upon hatching in the spring, the nymphs undergo several instars, feeding throughout the growing season. This synchronized emergence often coincides with the flush of new growth on willow trees, making the young tissues highly susceptible.

Damage caused by this insect is observed through chlorotic spotting, leaf curling, and overall wilting of shoots. Aside from direct feeding injury, the probing and piercing activity can create entry points for opportunistic fungal pathogens, further complicating the health status of the infested willow trees and reducing their marketability.

Effective management strategies for Macropsis fumipennis include integrated approaches.

• Sanitary pruning of infested shoots to reduce local populations.
• Monitoring for adult presence using yellow sticky traps during peak activity.
• Application of systemic insecticides targeting the nymphal stages during the early growing season.
• Maintaining optimal plant vigor through balanced fertilization and irrigation to improve tolerance against insect attacks.