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Dysaphis pyri (Boyer de Fonscolombe)
Sappaphis pyri

Insecta, Homoptera, Aphididae .

Pear bedstraw aphid

Description, Biology, Life Cycle, Damage, Common Names, Images


[R]Description
- Apterous adult: 2.5-3 mm long; globe-shaped; mauve-brown; covered with a purplish-white powdery secretion (*) ; antennae yellow with tip black; siphunculi black, perpendicular to body and longer than cone-shaped cauda; first 5 abdominal tergites with a double row of small dark spots.
- Alate: antennae entirely black.

[R]Biology
A heteroecious species with pear as primary host and Galium (Galium mollugo, G. aparine, G. sylvaticum) as secondary host.

[R]Life Cycle
- Winter eggs are deposited in crevices in the scars of the petioles of fruits and hatch in late March. Young fundatrices penetrate into the buds which have just opened, and fundatrigeniae colonize the foliage.
- 3-7 generations succeed one another on pear. Alatae emerge from the 3rd generation onwards and enventually breed on Galium. Apterous migrants are attended by several species of ants, which protect them from predators such as ladybirds, hoverflies and various hymenopterous insects. Winged sexuparae appear in early September and return to pear.

[R]Damage
- Affected leaves undergo severe transverse curling, rapidly becoming yellowish-green in colour (*) . Aphids produce considerable quantities of honeydew, thus causing a scorching of leaves which, moreover, become covered with sooty moulds. Growth is suddenly interrupted.
- In addition, curled leaves attract the pear psylla (Cacopsylla pyri).


[R]Common Names
DE: Mehlige Birnblattlaus ES: Pulgon del peral FR: Puceron cendré du poirier, Puceron mauve IT: Afide grigio del pero PT: Piolho cinzento da pereira GB: Pear bedstraw aphid

[R] Images

  1. Dysaphis pyri (Boyer de Fonscolombe) (Coutin R. / OPIE)
    Damage on pear Leaves are crinkled, discoloured and necrosed; the growth of stems is interrupted. Unaffected leaves remain normal.
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  2. Dysaphis pyri (Boyer de Fonscolombe) (Coutin R. / OPIE)
    Colony on pear On a petiole and a leaf. Growth of terminal bud is arrested.
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