With the genus Quercus as the main host, it is characterized by its intense red color (dye is extracted from them). At the beginning of summer they mate and oviposit (up to 1500 eggs). Upon hatching, the nymphs attach themselves to the trunk, from where they suck nutrients, until activity paralyzes in autumn/winter, to reactivate in spring, thus closing the cycle. The damage caused causes a loss of general vigor in the plant, which makes it less resistant to pests such as cerambix or diseases such as phytophthora.
It is a plague of North American origin, although it is growing and expanding rapidly in southern Europe. Its action hovers mainly to the genus Pinus. It presents several generations per year, although with greater activity in spring/summer, since with cold temperatures the nymphs stop their activity. Its dispersal occurs by contact between the crowns of contiguous trees, and by the wind. It is characterized by its intense activity, with a large amount of molasses excreted. The progressive decay caused by successive attacks will lead to the death of the affected specimens, in addition to facilitating the attack of other pests, such as Tomicus.
(Planococcus citri): commonly called cotonet, it is a polyphagous pest that mainly affects citrus trees, but also other hardwoods. About 2.5-5 mm long, the adult female slides down the branches, secreting cottony masses, which cover it and under which it oviposits. Upon emerging, the nymphs (N1-N3) are mobile, but they also disperse over the ants, which protect them from other predators and feed on the honeydew secreted by their feeding, especially in areas close to the fruit. The life cycle is about 6 weeks, which allows it to have up to 6 generations per year, which cause serious damage.