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Phylloxera vastatrix

Phylloxera
Dactylosphaera vitifolii 1 meyers 1888 v13 p621.png
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hemiptera
Suborder: Sternorrhyncha (was Homoptera)
Superfamily: Phylloxeroidea
Family: Phylloxeridae
Genus: Daktulosphaira
Shimer, 1866
Species: vitifoliae
Binomial name
Daktulosphaira vitifoliae
(Fitch 1855)

Grape phylloxera (Daktulosphaira vitifoliae (Fitch 1855); family Phylloxeridae, within the order Hemiptera, bugs); originally described in France as Phylloxera vastatrix; equated to the previously described Daktulosphaira vitifoliae, Phylloxera vitifoliae; commonly just called phylloxera (/fɪˈlɒksərə/; from Greek φύλλον, leaf, and ξερόν, dry) is a pest of commercial grapevines worldwide, originally native to eastern North America.

These almost microscopic, pale yellow sap-sucking insects, related to aphids, feed on the roots and leaves of grapevines (depending on the phylloxera genetic strain). On Vitis vinifera L., the resulting deformations on roots ("nodosities" and "tuberosities") and secondary fungal infections can girdle roots, gradually cutting off the flow of nutrients and water to the vine.Nymphs also form protective galls on the undersides of grapevine leaves of some Vitis species and overwinter under the bark or on the vine roots; these leaf galls are typically only found on the leaves of American vines.

American vine species (such as Vitis labrusca) have evolved to have several natural defenses against phylloxera. The roots of the American vines exude a sticky sap that repels the nymph form when it tries to feed from the vine by clogging its mouth. If the nymph is successful in creating a feeding wound on the root, American vines respond by forming a protective layer of tissue to cover the wound and protect it from secondary bacterial or fungal infections.


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Wikipedia

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