Posted on May 8, 2019

CACOPSYLLA PYRI PDF

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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The younger nymphs are yellowish with red-purple eyes.

EPPO Global Database

Retrieved from ” https: The wings are transparent, with dark veins and sometimes a smoky appearance near the base. Close Find out more.

The species is found in Europe, including Scandinavia, and in Asia. Trees grafted onto Pyrus pyrifolia cacopsyllq Pyrus ussuriensis rootstocks are more susceptible to this disease than those on Pyrus communis. 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.

The psyllia can also carry mycoplasma in their saliva which can cause disease of the conducting cells in the tree’s phloem.

Cacopsylla pyri

The secretions cause spots on the fruits which lower their value. Cookies on Plantwise Knowledge Bank Like most websites we use cookies. The secreted honeydew burns plant tissue and favours the growth of sooty mould. 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. The wasp Trechnites psyllae was the main parasitoid.

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Considerable damage is caused by the honeydew secreted by the larvae which stains leaves and fruit and which serves as the growth medium of black sooty mould.

Psylla pyri – Wikipedia

This page was last edited on 6 Mayat From Wikipedia, the free encyclopedia. Later in the summer, the eggs are laid beside the midribs of the leaves, on the petioles and on the flower buds. Cacopsylla pyriLinnaeus [1].

For further information, see Lyoussoufi et al. High population densities can cause premature leaf drop, which results in reduced flowering the following year. The colour is variable, ranging between orange-red and black, the thorax having whitish longitudinal stripes on its upper surface.

The excess honeydew produced by the insects coats the leaves, covering up the stomataand encourages the growth of sooty mould. Pyrus communis European pear.

Cacopdylla 20 April Retrieved 19 April Psylla pyri damages pear trees by sucking the plant sap ; leaves are yellowed and distorted and flower buds and fruitlets are shed. Knowledge Bank home Change location. Orchard Pest Management Online. Go to distribution map The larvae diminish plant growth by withdrawal of plant-sap. Research in an untreated orchard in Turkey found 32 predator and three parasitoid species of insect associated with this psylla.

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For further information, we recommend you visit the following resources: Like most websites we use cookies. The size of fruit is decreased and tree growth is diminished. Articles with ‘species’ microformats. Failure facopsylla nutrients to be translocated downwards can cause root starvation, with trees either declining slowly or suffering from sudden collapse. Chemical Control Due to the variable regulations around de- registration of pesticides, we are for pydi moment not including any specific chemical control recommendations.

pear sucker (Cacopsylla pyri)

The control of pear psyllids is integrated in a wider strategy of pest monitoring. Views Read Edit View history.

This psylla overwinters as an adult, concealing itself in a crack in the bark. Heavy infestations can 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. If infestation is heavy, considerable damage can be caused by the larvae of C. EU pesticides database www. This can sometimes lead to deformation of the leaves.

In spring it leaves diapauseand the female starts laying eggs round the base of the swelling buds.