General information about Cacopsylla pyri (PSYLPI). Sucking of larvae and adults, when populations are high, can produce pustules on branchlets and spots on leaves. This can sometimes lead to deformation of. ABSTRACT. The psyllid Cacopsylla pyri L. (Hemiptera: Psyllidae), is one of the principal pests of pear (Pyrus spp.) orchards and, along with its natural enemies, .
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From Wikipedia, the free encyclopedia. This psylla overwinters as an adult, concealing itself in a crack in the bark. Later in the summer, the eggs are laid beside the midribs of the leaves, on the petioles and on the flower buds. Chemical Control Due to the variable regulations around de- registration of pesticides, we are for the moment not including any specific chemical control recommendations.
High population densities can cause premature leaf drop, which results in reduced flowering the following year.
The species is found in Europe, including Scandinavia, and in Asia. Psylla pyricommonly known as the pear psylla or pear psyllidis a true bug in the family Psyllidae.
Continuing to use www. These diseases cause severe growth abnormalities of pear trees. Cacopslyla pyriLinnaeus .
In spring it leaves diapauseand the female starts laying eggs round the base of the swelling buds. Retrieved from ” https: Orchard Pest Management Online. Failure of nutrients to be translocated downwards can cause root starvation, with trees either declining slowly pyti suffering from sudden collapse.
The colour is variable, ranging between orange-red and black, the thorax having whitish longitudinal stripes on its upper surface.
If infestation is heavy, considerable damage can cqcopsylla caused by the larvae of C. Views Read Edit View history. The wings are transparent, with dark veins and sometimes a smoky appearance near the base. Later instar nymphs are purplish-brown cacospylla reddish-brown, with white longitudinal stripes and black patches; the developing wing-pads each bear a single knobbed bristle. This page was last edited on 6 Mayat Articles with ‘species’ microformats.
It is a pest of pear trees, sucking the sap, damaging the foliage, flowers and fruit and diminishing the crop. The predators included the predatory bugs Anthocoris nemoralis and Deraeocoris spp.
This is to ensure that we give you the best experience possible. Pyrus communis European pear.
The size of fruit is decreased and tree growth is diminished. EU pesticides database www. Heavy infestations cacopsylla result in “psylla shock”, caused by toxins in the saliva and resulting in defoliation or fruit drop, which may also affect the following year’s crop.
The psyllia can also carry mycoplasma in their saliva which can cause disease of the conducting cells in the tree’s phloem.
For further information, we recommend you visit the following resources: The secretions cause spots on the fruits which lower their value. If you would like to, you can learn more about the cookies we use. The larvae diminish plant growth by withdrawal of plant-sap. Trees grafted onto Pyrus pyrifolia or Pyrus ussuriensis rootstocks are more susceptible to this disease than those on Pyrus communis.
The nymphs moult five times, and both nymphs and adults insert their mouthparts deep into the phloem tissue to suck the sap, secreting the excess fluid as honeydew.
Considerable damage is caused by the honeydew secreted by pyrj larvae which stains leaves and fruit and which serves as the growth medium of black sooty mould. The younger nymphs are yellowish with red-purple eyes. Retrieved 19 April Knowledge Bank home Change location. Psylla pyri damages pear trees by sucking the plant sap ; leaves are yellowed and distorted and flower buds and fruitlets are shed.
Sucking of larvae and adults, when populations are high, can produce pustules on branchlets and spots on leaves. This can sometimes lead to deformation of the leaves. Pests of Fruit Crops: Close Find out more.