Psilla: General information
The Cacopsylla piricola is a sucking insect that spreads on the buds and small fruits, and often also on the underside of the leaves, of fruit and ornamental plants.
These insects cause serious damage, both because massive attacks cause a severe deterioration of the plant and a reduced production of flowers and fruits (sometimes even defoliation and fruit drop), and because, covering themselves with honeydew, they favor the development of fumaggini also very large .
The adults of psyllids they look like small cicadas, about two centimeters long, reddish-brown with a dark abdomen, the wings are sloping and translucent.
They winter nestled under the bark of trees, but also under the trees that fell to the ground. with the first warm springs they come out of the shelters and lay 3-4 generations of yellowish eggs in succession, on the twigs, under the bark and on the shoots of plants.
There psyllids it attacks most of the fruit plants, but in particular almost all the truths of pear, and also ornamental plants such as the laurel cherry.
The psylla has many enemies among other insects, such as ladybirds that feed on eggs; however, when the attack is massive it is good to contain the population with chemical insecticides, for example with Fenitrothion, Amitraz, Acefate, or with pyrethroids. Before spraying the plants with the chosen insecticide it is appropriate to use potassium salts to wash the honeydew that covers the nymphs protecting them.