Plant Parasites of Europe

leafminers, galls and fungi


Persicaria knotweed

The classical genus Polygonum has been split into Bistorta, Fallopia (incl. Reynoutria), Persicaria, and Polygonum.

Dichotomous table for leafminers

1a small, brown, tentiform mine: Calybites phasianipennella

1b corridor: Chromatomyia horticola

1c blotch, may be preceded by a corridor => 2

1d galls, etc => Tables for all parasites per species

2a large blotch, not preceded by a corridor; larvae communal; at the start of the mine mostly a group of some elongated egg shells => 3

2b blotch preceded by a narrow corridor; larva solitary; no egg shell visible: Agromyza polygoni

3a larva: mandible with some fine teeth: Pegomya bicolor

3b mandible with ± 3 large teeth: Pegomya solennis **

** It is possibly that also Pegomya setaria, primarily a miner of Fallopia-species, may occur now and then on Persicaria; there is no possibility to discriminate the larva from that of P. solennis.

Not included in the key: Mantura rustica.

Tables for all parasites per species

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