Variegated leafhopper

Scaphoideus intricatus is a member of the Cicadellidae family within the order Hemiptera. This leafhopper species is recognized by its intricate wing patterns, which serve as camouflage against the foliage of host plants. As a piercing-sucking insect, it has become a subject of concern in viticulture due to its ability to colonize large vineyard areas.

The primary host for this pest is the grapevine. While it is often found on wild Vitis species, it readily transitions to commercial vineyard varieties. The insect thrives in temperate climates, where the vineyard environment provides ample nutrition and shelter for multiple generations to develop during the growing season.

The life cycle of the pest involves egg overwintering, typically embedded within the bark of one-year-old shoots. Nymphs emerge in the spring and undergo five instars before reaching the adult stage. The transition from nymph to adult involves significant changes in movement patterns, with adults becoming highly active flyers during the mid-summer heat.

Damage is characterized by chlorotic spotting on leaves, which eventually leads to leaf curling and necrosis. By extracting sap, the leafhopper reduces the vine's photosynthetic capacity, resulting in stunted shoot growth and reduced sugar accumulation in the berries. Additionally, there is a risk of the leafhopper acting as a vector for various plant pathogens which can compromise the entire vine structure.

Management strategies for this pest require a multi-faceted approach. Monitoring for early nymph activity is critical to timing chemical interventions correctly. Cultural practices, such as pruning away infested canes and managing weeds that serve as alternate hosts, can significantly reduce population density. Integrated pest management (IPM) techniques should prioritize the protection of beneficial predatory insects while targeting the leafhopper populations.

• Deploy yellow sticky traps for population monitoring.
• Conduct timely pruning to remove egg-laying sites.
• Apply systemic insecticides during the peak of nymph emergence.
• Maintain weed control to eliminate secondary host plants.