Plagiotrochus amenti Kieffer, 1901

on Quercus, agamnous generation

gall

Larvae solitary in 1 x 3 mm large elliptic cells in 2-3 years old branches; only during mass occurrences some swelling does occur, and the galls can be found only by looking for exit holes. Pupation within the gall; the galls may be vacated in the second or third year.

host plants

Fagaceae, monophagous

Quercus suber.


on Quercus, sexual generation

Plagiotrochus amenti: catkin gall on Quercus suber

Quercus suber, catkin gall (from Houard, 1908a)

gall

gall chamber of 0.7 x 2 mm under the bark of one year old twigs or in the swollen axis of catkins, rarely in a petiole or thick vein. Infested parts of the plants are slightly swollen or contorted. The adult wasps emerge early in the summer.

hostplants

Fagaceae, monophagous

Quercus suber.

synonyms

Plagiotrochus suberi Weld, 1926.

notes

the species is a threat for the cork production.

inquilines

Ceroptres cerri; Saphonecrus lusitanicus.

references

Cerasa (2015a), Cerasa, lo Verde & Massa (2014a), Dauphin & Aniotsbehere (1997a), Garbin, Díaz & Pujade-Villar (2008a), Houard (1908a), Kwast (2014a), Nieves-Aldrey (2001a), Nieves-Aldrey, Gómez, Hernández Nieves & Lobo (2006a), Pujade-Villar, Garbin, Paretas-Martínez & Díaz (2008a), Pujade-Villar, Grami & Ben Jamâa (2010a), Pujade, Villemant & Andreï-Ruiz (2000a).

mod 5.i.2019