Common pear leaf sucker
| Pear leaf sucker | ||||||||||||
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Pear leaf suckers ( Cacopsylla pyri ) |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Cacopsylla pyri | ||||||||||||
| ( Linnaeus , 1758) |
The common pear leaf sucker ( Cacopsylla pyri , syn .: Psylla pyri ) is a species from the superfamily of leaf fleas , which is a pear pest .
features
Adult animals ( imagines ) of the common pear leaf sucker are approximately 2.5 to 3.5 millimeters long, slightly larger females than males. The species occurs in two color variants ( color dimorphism ). Overwintering individuals (winter generation) are predominantly colored green. The membrane of the wings is hyaline (crystal clear) with a dark point inside each at the tip of the clavus . Individuals of the summer generation (s) are yellow, brownish or black in color, with a lightly striped trunk. The cells of the forewings are fuzzy, centrally darkened, with no or little prominent point. The cheekbones of the summer generation are strikingly pale in color, while in the winter generation they are darkened towards the tip. The nymphs of the fifth (last) larval stage are colored green with cinnamon-colored wing sheaths and sclerites .
The 0.3 mm large eggs of the pear leaf sucker are initially white, later turning yellow. They are placed next to each other in small groups. The nymphs can grow up to 2 mm. They are initially orange-yellow and pigmented dark brown. Older nymphs have small wing scales .
The species is difficult to distinguish from other leaf fleas that also live on pears, especially Cacopsylla pyricola . These species can only be distinguished genitally morphologically. In fact, it is a species complex of seven species, most of which have not yet been differentiated.
Way of life
In addition to the cultivated pear ( Pyrus communis ), the Asia Minor pear ( Pyrus elaeagrifolia ) is known as the host species . The species overwinters as a fully grown insect (imago) on the host, in cracks and under bark scales. In spring, the females lay small clutches on young twigs, later generations also on the underside of leaves. Nymphs and adults suckle on leaves and on leaf and flower stalks. The species has in the north of its range, in Scandinavia, two generations a year ( bivoltin ). In the south, numerous successive generations are possible, in France, for example, up to five generations a year.
distribution
The species is widespread in the Palearctic , from Europe across the Caucasus and Central Asia east to China.
Combat
The common pear leaf sucker is difficult to fight. Usually the larvae are treated with Abamectin ( Vertimec ). Ovicides ( Diflubenzuron , Teflubenzuron ) have a partial effect against the eggs of the 2nd generation.
swell
- KOB Bavendorf: Common pear leaf sucker
- DLR RLP: pear leaf vacuum
- Frej Ossiannilsson : The Psylloidea (Homoptera) of Fennoscandia and Denmark. Fauna entomologica Scandinavica Vol. 26. Brill Scientific Publishers, 1992
Individual evidence
- ^ ID Hodkinson (1986): A revision of the west palearctic pear psyllids (Hemiptera Psyllidae). Bulletin of Entomological Research 76: 119-132.
- ↑ Syngenta Vertimec
