Two-lined leafhopper

The two-lined leafhopper (Typhlocyba nigrobilineata) belongs to the Hemiptera order and the Cicadellidae family. This small sucking insect is a common pest in orchards, known for its ability to significantly deplete plant resources during the growing season through intensive feeding.

The species primarily affects fruit trees such as apples, pears, cherries, and plums. It thrives in dense tree canopies, where it can easily multiply and spread throughout the orchard if not managed properly. The economic impact is linked to the loss of photosynthetic efficiency of the host plants.

The biological cycle involves wintering in the egg stage, typically embedded under the bark of young shoots. After hatching in the spring, the nymphs begin feeding on the underside of leaves. The life cycle consists of multiple nymphal instars before reaching the adult winged stage, which remains highly mobile and continues to feed.

Feeding damage is characterized by stippling and chlorosis on the leaves, where the leaf surface turns mottled with pale white or yellow spots. This physiological stress restricts the plant's ability to produce sugars, leading to stunted shoot growth, poor fruit quality, and premature leaf drop, especially during dry summer periods.

Effective management strategies combine cultural practices and chemical control. Growers should prioritize orchard hygiene, including the removal of infested shoots and weed control in the under-tree area. Chemical control involves the application of systemic or contact insecticides during the early stages of infestation to prevent population outbreaks, always adhering to pesticide safety regulations.