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They are so called some sucking insects (Zygina rhamni, Stichtocephala bisonia, Empoasca flavescens, Scaphoideus titanus) of the family of leafhoppers, of small size, about 2-3 mm, of varied color, from light green to brown to yellow, which infest the plants fruit and ornamental, particularly colonizing the lower pages of the leaves, in a place far from direct sunlight. They can be found both in the larval stage, and in the adult one, in this case they have wings, and they move as soon as they try to touch the plant. Generally they produce three or four generations a year; first-generation adults tend to move to other plants in spring; the adult specimens spend the winter on evergreen plants.
Their bites cause yellowish circular pustules, leaf browning, drying out and sometimes even curling of young leaves. The greatest damage occurs in the period from June to September, in the hottest and driest months of the year.
We must pay close attention to these insects especially because they are vectors of multiple viruses and phytoplasmas, which suck from diseased plants and transmit to neighboring plants.
In particular the Scaphoideus titanus is a vector of a very serious viral disease of the vine, the golden flavescence, which, coming from France, is spreading rapidly in northern Italy; in some municipalities the fight against the leafhopper of the vine, especially Scaphoideus titanus, is mandatory.
To be able to contain the damage caused by leafhoppers It is very important to act promptly, even when only a few specimens are found, spraying the affected plants with specific insecticides of different types, depending on the time of year, so as to use the most suitable for each stage of growth of the leafhoppers. At the beginning of summer, in the presence of adults, we intervene with insecticides based on Fenitrothion, or Bupofezin.
In summer imidacloprid is used, a broad-spectrum systemic insecticide.