Vine leafhopper

The Vine leafhopper (Alconeura depressa) is an insect species belonging to the order Hemiptera and the family Cicadellidae. It is recognized as a significant pest in viticulture, as it feeds directly on the vine tissues, causing physiological stress to the plants and potentially reducing overall yield quality.

This species primarily targets cultivated grapevines. Both nymphs and adults are highly mobile, feeding on the undersides of the leaves. By using their piercing-sucking mouthparts, they drain essential plant fluids, which leads to the disruption of chlorophyll and metabolic pathways necessary for healthy vine development.

The life cycle of this pest involves several stages, including eggs, nymphs, and adults. Overwintering typically occurs in the adult stage within leaf litter, tall grasses, or the bark crevices of the host plants. As spring temperatures rise, they emerge and migrate toward budding vines to commence their reproductive cycle, often producing multiple overlapping generations during the growing season.

The damage caused by Alconeura depressa is characterized by a stippling effect on the foliage. Initial symptoms present as small, pale yellow spots on the upper leaf surface, which gradually increase in density. Severe infestations can lead to leaf yellowing, browning of margins, and premature abscission, which significantly impairs the sugar accumulation in grape berries.

Effective management requires an integrated approach. Essential control measures include:

• Sanitation practices, such as removing fallen leaves and weeds that serve as overwintering sites.
• Regular monitoring of adult populations using sticky traps.
• Strategic application of specialized insecticides when pest levels exceed established thresholds, ensuring compatibility with beneficial predatory insects.