Grape leafhopper

The grape leafhopper (Erythroneura vitis) is a small sucking insect belonging to the order Hemiptera and the family Cicadellidae. It is a well-known pest in viticulture, capable of causing significant economic losses by damaging the foliage of grapevines.

These pests feed exclusively on Vitis species, including cultivated grapes. The insects thrive in vineyards where they have constant access to succulent leaves, which provide both food and a breeding ground for multiple generations of the pest throughout the growing season.

The life cycle consists of egg, nymph, and adult stages. Adults overwinter in protected areas such as leaf litter, bark crevices, or nearby weeds. As temperatures rise in spring, they migrate to the vines to feed and lay eggs into the leaf tissue, initiating the first generation of the year.

Damage is characterized by stippling, where the feeding activity causes small white or yellow spots on the leaves. As the infestation progresses, these spots coalesce, leading to leaf bronzing, drying, and premature senescence. This reduction in leaf area directly impacts photosynthesis, sugar accumulation, and overall fruit quality.

Management strategies require a combination of cultural and chemical controls. Maintaining a clean vineyard floor and removing debris is essential to reduce overwintering sites. When monitoring indicates that populations exceed economic thresholds, growers should apply targeted insecticides, focusing on the nymphal stages to prevent further spread.

• Remove and destroy fallen leaves in autumn.
• Control weeds in and around the vineyard rows.
• Monitor nymph populations using sticky cards.
• Apply systemic insecticides during early infestation stages.