The pear psylla, Cacopsylla pyri , is a widely distributed pest of pear in central Europe and can inflict serious damage in pear orchards. Adults pear psyllas are mm long and orange red to blackish. They have white, longitudinal stripes on the back of the thorax. Their forewings are clear with dark veins. The eggs are oval, approximately 0. The nymphs are initially yellowish with clearly visible purplish-red eyes.
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The pear psylla, Cacopsylla pyri , is a widely distributed pest of pear in central Europe and can inflict serious damage in pear orchards. Adults pear psyllas are mm long and orange red to blackish. They have white, longitudinal stripes on the back of the thorax.
Their forewings are clear with dark veins. The eggs are oval, approximately 0. The nymphs are initially yellowish with clearly visible purplish-red eyes. Later instars are purplish to reddish brown with whitish longitudinal stripes and blackish markings on the head and body. Pear psyllas overwinter as adults, sheltering on the bark of pear trees. The adults become active in spring and start to feed on young leaves and flowers.
Eggs are deposited in crevices of the bark of twigs and hatch after about 3 weeks. There are 5 nymphal instars which feed on twigs and shoots. Depending on the temperature, there are 3 or more generations per year. Overwintering adults are produced in November or December.
Pear psylla feeding leads to growth inhibition and malformation of leaves and fruits. Heavy infestations can cause premature leaf fall and fruit drop. Flowers attacked by first generation nymphs turn brown and die. Feeding later in the season may affect the harvest of the next year by weakening or killing fruit buds.
Pear psyllas excrete large amounts of honeydew. Sooty moulds often grow on the honeydew covering shoots, leaves and developing fruits with a sticky black layer.
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List of symptoms / signs
We'd like to understand how you use our websites in order to improve them. Register your interest. The frequency of pear decline-positive insects and transmission of pear decline PD phytoplasma by Cacopsylla pyri in Spain has been studied. Psyllids were used for experiments on phytoplasma transmission both to healthy Pyrus communis trees and to an artificial feeding medium. Over a period of 1 year, about psyllids were collected monthly from pear trees, cv.
EPPO Global Database
We'd like to understand how you use our websites in order to improve them. Register your interest. A number of species of the family Psyllidae, commonly called jumping plant lice, are economically important as vectors of pathogenic phytoplasmas in fruit crops. Pear psyllids of the species Cacopsylla pyri L. These phloem feeding insects transmit pear decline, a disease caused by the phytopathogenic bacterium Candidatus Phytoplasma pyri. Knowledge of the signals used for intraspecific communication, especially during mating behavior, is essential to design ecological control strategies against this vector insect.
Psylla pyri , commonly known as the pear psylla or pear psyllid , is a true bug in the family Psyllidae. Originating in Europe and Asia, it has spread to North America. It is a pest of pear trees, sucking the sap, damaging the foliage, flowers and fruit and diminishing the crop. The colour is variable, ranging between orange-red and black, the thorax having whitish longitudinal stripes on its upper surface. The wings are transparent, with dark veins and sometimes a smoky appearance near the base. Later instar nymphs are purplish-brown or reddish-brown, with white longitudinal stripes and black patches; the developing wing-pads each bear a single knobbed bristle.