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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This page was last edited on 6 Mayat If you would like to, you can learn more about the cookies we use. The colour is variable, ranging between orange-red and black, the thorax having whitish longitudinal stripes on its upper surface.
Pests of Fruit Crops: Pyrus communis European pear. These diseases cause severe growth abnormalities of pear trees. 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.
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Failure of nutrients to be translocated downwards can cause root starvation, with trees either declining slowly or suffering from sudden collapse.
The nymphs moult five times, and both nymphs and adults insert their mouthparts pyrk into the phloem tissue to suck the sap, secreting the excess fluid as honeydew. The larvae diminish plant growth caocpsylla withdrawal of plant-sap. 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 excess honeydew produced by the insects coats the leaves, covering up the stomataand encourages the growth of sooty mould. Cacopsylla pyriLinnaeus . This is to ensure that we cacopshlla you the best experience possible. Retrieved 20 April Retrieved from ” https: Psylla pyricommonly known as the pear psylla or pear psyllidis a true bug in the family Psyllidae.
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The wasp Trechnites psyllae was the main parasitoid. Psylla pyri damages pear trees by sucking the plant sap ; leaves are yellowed and distorted and flower buds and fruitlets are shed.
If infestation is heavy, considerable damage can be caused by the larvae of C. The species is found in Europe, cacopsyllx Scandinavia, and in Asia. Pyrl to use www. Go to distribution map Views Read Edit View history. Retrieved 19 April Research in an untreated orchard in Turkey found 32 predator and three parasitoid species of insect associated with this psylla.
Cacopsylla pyri – Wikispecies
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. This psylla overwinters as an adult, concealing itself in a crack in the bark.
Trees grafted onto Pyrus pyrifolia or Pyrus ussuriensis rootstocks are more susceptible to this disease than those on Pyrus communis.