Cixiid planthopper

Systematic position: Reptalus cuspidatus belongs to the order Hemiptera and the family Cixiidae. It is recognized globally as a significant agricultural pest, particularly due to its role as a vector for serious phytoplasma diseases that affect grapevine health.

Crops affected: This insect primarily targets grapevines (Vitis vinifera). However, its survival is heavily dependent on the presence of diverse herbaceous weeds in and around the vineyard, which provide the necessary nutrition for its larval stages to thrive underground.

Biology and life cycle: The insect follows a hemimetabolous development cycle. The nymphs spend most of their time in the soil, feeding on roots of grasses and weeds. Adults emerge in early summer and migrate to the vine canopy to feed on the phloem sap, mate, and deposit eggs, completing one generation per year.

Damage and economic impact: While direct feeding damage to the vine leaves is often negligible, the economic consequences are severe due to the transmission of phytoplasmas. These pathogens cause the 'Bois noir' disease, leading to symptoms such as leaf yellowing, bunch necrosis, reduced berry size, and in chronic cases, the total death of the vine stock.

Protection measures: Management strategies focus on reducing the reservoir of the pest and breaking the infection cycle. Key practices include:

• Removing weed cover in vineyards to eliminate larval food sources.
• Implementing systematic insecticide treatments during the peak adult migration period.
• Utilizing sticky yellow traps for early monitoring of adult activity.
• Ensuring proper vineyard sanitation and using high-quality planting material.